AS5043ASSU - AMS - Pdf.Support

AS5043

Data Sheet - Pin Configuration

www.austriamicrosystems.com Revision 1.80 1 – 36

1 General Description

The AS5043 is a contactless magnetic angle encoder for

accurate measurement up to 360°.

It is a system-on-chip, combining integrated Hall

elements, analog front end and digital signal processing

in a single device.

The AS5043 provides a digital 10-bit as well as a

programmable analog output that is directly proportional

to the angle of a magnet, rotating over the chip.

The analog output can be configured in many ways,

including user programmable angular range, adjustable

output voltage range, voltage or current output, etc..

An internal voltage regulator allows operation of the

AS5043 from 3.3V or 5.0V supplies.

2 Benefits

Complete system-on-chip

 Flexible system solution provides absolute output,

both digital and analog

 Angle measurement with software programmable

range up to 360°

 High reliability due to non-contact magnetic sensing

 Ideal for applications in harsh environments

 Robust system, tolerant to magnet misalignment,

airgap variations, temperature variations and

external magnetic fields

 No calibration required

3 Key Features

 360° contactless high resolution angular position

encoding

 User programmable zero position

 Two 10-bit absolute outputs:

 Serial digital interface and

 Versatile analog output

programmable angular range up to 360°

programmable ratiometric output voltage range

 Failure detection mode for magnet field strength

and loss of power supply

 Serial read-out of multiple interconnected

AS5043 devices using daisy chain mode

 Mode input for optimizing noise vs. speed

 Alignment mode for magnet placement guidance

 Wide temperature range: - 40°C to + 125°C

 Small package: SSOP 16 (5.3mm x 6.2mm)

4 Applications

The AS5043 is ideal for applications with an angular

travel range from a few degrees up to a full turn of

360°, such as

- Industrial applications:

- Contactless rotary position sensing

- Robotics

- Valve Controls

- Automotive applications:

- Throttle position sensors

- Gas / brake pedal position sensing

- Headlight position control

Front panel rotary switches

Replacement of potentiometers

Figure 1: Typical Arrangemen t of AS5043 an d Magnet

Data Sheet

AS5043

Programmable 360° Magnetic Angle Encoder

with Absolute SSI and Analog Outputs

AS5043

Data Sheet - Pin Configuration

www.austriamicrosystems.com Revision 1.80 2 – 36

5 Pin Configuration

Figure 2: AS5043 Pin Configuration SSOP16

MagRngn

Prog_DI

VSS

CLK

CSn

VDD5V

DACref

DACout

Vout

Mode VDD3V3

Package = SSOP16 (16 lead Shrink Small Outline Package)

Table 1: Pin Description SSOP16

Pin Symbol Type Description

1 MagRngn DO_OD Magnet Field Magnitude RaNGe warning; active low, indicates that the magnetic field

strength is outside of the recommended limits.

2 Mode DI_PD, ST

Mode input. Select between low noise (low, connect to VSS) and high speed (high,

connect to VDD5V) mode at power up. Internal pull-down resistor.

3 CSn DI_PU, ST

Chip Select, active low; Schmitt-Trigger input, internal pull-up resistor (~50kΩ)

4 CLK DI,ST Clock Input of Synchronous Serial Interface; Schmitt-Trigger input

5 NC - must be left unconnected

6 DO DO_T Data Output of Synchronous Serial Interface

7 VSS S Negative Supply Voltage (GND)

8 Prog_DI DI_PD

OTP Programming Input and Data Input for Daisy Chain mode. Internal pull-down resistor

(~74kΩ).

Should be connected to VSS if programming is not used

9 DACref AI DAC R ef erence voltage input for external reference

10 DACout AO DAC output (unbuffered, Ri ~8kΩ)

11 FB AI Feedback, OPAMP inverting input

12 Vout AO OPAMP output

13 NC - Must be left unconnected

14 NC - Must be left unconnected

15 VDD3V3 S 3V-Regulator Output for internal core, regulated from VDD5V.Connect to VDD5V for 3V

supply voltage. Do not load externally.

16 VDD5V S Positive Supply Voltage, 3.0 to 5.5 V

DO_OD digital output open drain S supply pin AI analog input

DI_PD digital input pull-down DO_T digital output /tri-state AO analog output

DI_PU digital input pull-up ST Schmitt-trigger input DI digital input

AS5043

Data Sheet - Pin Configuration

www.austriamicrosystems.com Revision 1.80 3 – 36

5.1 Pin Description

Pins 7, 15 and 16 are supply pins, pins 5, 13 and 14 are for internal use and must be left open.

Pin 1 is the magnetic field strength indicator, MagRNGn. It is an open-drain output that is pulled to VSS when the

magnetic field is out of the recommended range (45mT to 75mT). The chip will still continue to operate, but with reduced

performance, when the magnetic field is out of range. When this pin is low, the analog output at pins #10 and #12 will be

0V to indicate the out-of-range condition.

Pin 2 MODE allows switching between filtered (slow) and unfiltered (fast mode). This pin must be tied to VSS or VDD5V,

and must not be switched after power up. See section 0.

Pin 3 Chip Select (CSn; active low) selects a device for serial data transmission over the SSI interface. A “logic high” at

CSn forces output DO to digital tri-state.

Pin 4 CLK is the clock input for serial data transmission over the SSI interface (see section 1)

Pin 6 DO (Data Out) is the serial data output during data transmission over the SSI interface (see section 1)

Pin 8 PROG_DI is used to program the different operation modes, as well as the zero-position in the OTP register.

This pin is also used as a digital input to shift serial data through the device in Daisy Chain Configuration, (see page 9).

Pin 9 DACref is the external voltage reference input for the Digital-to-Analog Converter (DAC). If selected, the analog

output voltage on pin 12 (Vout) will be ratiometric to the voltage on this pin.

Pin10 DACout is the unbuffered output of the DAC. This pin may be used to connect an external OPAMP, etc. to the

DAC.

Pin 11 FB (Feedback) is the inverting input of the OPAMP buffer stage.

Access to this pin allows various OPAMP configurations.

Pin 12 Vout is the analog output pin. The analog output is a DC voltage, ratiometric to VDD5V (3.0 – 5.5V) or an external

voltage source and proportional to the angle.

AS5043

Data Sheet – Functional Description

www.austriamicrosystems.com Revision 1.80 4 – 36

6 Functional Description

The AS5043 is manufactured in a CMOS standard process and uses a spinning current Hall technology for sensing the

magnetic field distribution across the surface of the chip.

The integrated Hall elements are placed in a circle around the center of the device and deliver a voltage representation of

the magnetic field perpendicular to the surface of the IC.

Through Sigma-Delta Analog / Digital Conversion and Digital Signal-Processing (DSP) algorithms, the AS5043 provides

accurate high-resolution absolute angular position information. For this purpose a Coordinate Rotation Digital Computer

(CORDIC) calculates the angle and the magnitude of the Hall array signals.

The DSP is also used indicate movements of the magnet towards or away from the chip and to indicate, when the

magnetic field is outside of the recommended range (status bits = MagInc, MagDec; hardware pin = MagRngn).

A small low cost diametrically magnetized (two-pole) standard magnet, centered over the chip, is used as the input

device.

The AS5043 senses the orientation of the magnetic field and calculates a 10-bit binary code. This code can be accessed

via a Synchronous Serial Interface (SSI). In addition, the absolute angular representation is converted to an analog

signal, ratiometric to the supply voltage.

The analog output can be configured in many ways, such as 360°/180°/90° or 45° angular range, external or internal DAC

reference voltage, 0-100%*VDD or 10-90% *VDD analog output range, external or internal amplifier gain setting.

The various output modes as well as a user programmable zero position can be programmed in an OTP register. As long

as no programming voltage is applied to pin PROG, the new setting may be overwritten at any time and will be reset to

default when power is cycled. To make the setting permanent, the OTP register must be programmed by applying a

programming voltage.

The AS5043 is tolerant to magnet misalignment and unwanted external magnetic fields due to differential measurement

technique and Hall sensor conditioning circuitry.

It is also tolerant to airgap and temperature variations due to Sin-/Cos- signal evaluation.

Figure 3: AS5043 Block Diagram

Sin

Cos

Ang

Mag

MagRNGn

Mode

CLK

Vout

Prog_DI

CSn

DACout

DACref

AS5043

Data Sheet – 3.3V / 5V Operation

www.austriamicrosystems.com Revision 1.80 5 – 36

7 3.3V / 5V Operation

The AS5043 operates either at 3.3V ±10% or at 5V ±10%. This is made possible by an internal 3.3V Low-Dropout (LDO)

Voltage regulator. The core supply voltage is always taken from the LDO output, as the internal blocks are always

operating at 3.3V.

For 3.3V operation, the LDO must be bypassed by connecting VDD3V3 with VDD5V (see Figure 4 ).

For 5V operation, the 5V supply is connected to pin VDD5V, while VDD3V3 (LDO output) must be buffered by a 1...10µF

capacitor, which should be placed close to the supply pin.

The VDD3V3 output is intended for internal use only. It should not be loaded with an external load.

The voltage levels of the digital interface I/O’s correspond to the voltage at pin VDD5V, as the I/O buffers are supplied

from this pin (see Figure 4).

Figure 4: Connections for 5V / 3.3V Suppl y Voltages

A buffer capacitor of 100nF is recommended in both cases close to pin VDD5V. Note that pin VDD3V3 must always be

buffered by a capacitor. It must not be left floating, as this may cause an instable internal 3.3V supply voltage which may

lead to larger than normal jitter of the measured angle.

AS5043

Data Sheet – 10-bit Absolute Synchronous Serial Interface (SSI)

www.austriamicrosystems.com Revision 1.80 6 – 36

8 10-bit Absolute Synchronous Serial Interface (SSI)

The serial data transmission timing is outlined in Figure 5: if CSn changes to logic low, Data Out (DO) will change from

high impedance (tri-state) to logic high and the read-out sequence will be initiated.

After a minimum time tCLK FE, data is latched into the output shift register with the first falling edge of CLK.

Each subsequent rising CLK edge shifts out one bit of data.

The serial word contains 16 bits, the first 10 bits are the angular information D[9:0], the subsequent 6 bits contain system

information, about the validity of data such as OCF, COF, LIN, Parity and Magnetic Field status (increase / decrease / out

of range) .

A subsequent measurement is initiated by a logic “high” pulse at CSn with a minimum duration of tCSn.

Data transmission may be terminated at any time by pulling CSn = high.

8.1 Serial Data Contents

D9:D0 absolute angular position data (MSB is clocked out first).

OCF (Offset Compensation Finished), logic high indicates that the Offset Compensation Algorithm has finished and data

is valid.

COF (Cordic Overflow), logic high indicates an out of range error in the CORDIC part. When this bit is set, the data at

D9:D0 is invalid. The absolute output maintains the last valid angular value.

This alarm may be resolved by bringing the magnet within the X-Y-Z tolerance limits.

LIN (Linearity Alarm), logic high indicates that the input field generates a critical output linearity.

When this bit is set, the data at D9:D0 may still be used, but may contain invalid data. This warning may be resolved by

bringing the magnet within the X-Y-Z tolerance limits.

Data D9:D0 is valid, when the status bits have the following configurations:

Table 2: Status Bit Outputs

OCF COF LIN Mag

INC Mag

DEC Parity

0 0

0 1

1 0 0

1 0

even checksum of bits 1:15

MagInc, (Magnitude Increase) becomes HIGH, when the magnet is pushed towards the IC, thus the magnetic field

strength is increasing.

MagDec, (Magnitude Decrease) becomes HIGH, when the magnet is pulled away from the IC, thus the magnetic field

strength is decreasing.

Both signals HIGH indicate a magnetic field that is out of the allowed range (see Table 3).

Note: Pin 1 (MagRngn) is a combination of MagInc and MagDec. It is active low via an open drain output and requires an

external pull-up resistor. If the magnetic field is in range, this output is turned off. (logic “high”).

Even Parity bit for transmission error detection of bits 1…15 (D9…D0, OCF, COF, LIN, MagInc, MagDec)

The absolute angular output is always set to a resolution of 10 bit / 360°. Placing the magnet above the chip, angular

values increase in clockwise direction by default.

Figure 5: Synchronous Serial Interface wi th Absolute Angular Posi tion Data

Even

PAR

CSn

CLK

DO D9 D8 D7 D6 D5 D4 D3 D2 D1 D0

18 16

COF LINOCF Mag

INC Mag

DEC

t DO active t DO Tristate

t CLK FE

t DO valid

t CLK FE

t CSn T CLK / 2

Angular Position Data Status Bits

AS5043

Data Sheet – 10-bit Absolute Synchronous Serial Interface (SSI)

www.austriamicrosystems.com Revision 1.80 7 – 36

8.2 Z-Axis Range Indication (Push Button Feature, Red/Yellow/Green Indicator)

The AS5043 provides several options of detecting movement and distance of the magnet in the vertical (Z-) direction.

Signal indicators MagINC, MagDEC and LIN are available as status bits in the serial data stream, while MagRngn is an

open-drain output that indicates an out-of range status (on in YELLOW or RED range). Additionally, the analog output

provides a safety feature in the form that it will be turned off when the magnetic field is too strong or too weak (RED

range). The serial data is always available, the red/yellow/green status is indicated by the status bits as shown below:

Table 3: Magnetic Field Strength Indicators

SSI Status Bits Hardware Pins

Mag

INC Mag

DEC LIN Mag

Rngn Analog

Output Description

0 0 0 Off enabled

No distance change

Magnetic Input Field OK (GREEN range, ~45…75mT)

0 1 0 Off enabled

Distance increase, GREEN range; Pull-function. This state is dynamic and only

active while the magnet is moving away from the chip.

1 0 0 Off enabled

Distance decrease, GREEN range; Push- function. This state is dynamic and only

active while the magnet is moving towards the chip.

1 1 0 On enabled

YELLOW Range: Magnetic field is ~ 25…45mT or ~75…135mT. The AS5043 may

still be operated in this range, but with slightly reduced accuracy.

1 1 1 On disabled

RED Range: Magnetic field is ~<25mT or >~135mT. The analog output will be

turned off in this range by default. It can be enabled permanently by OTP

programming (see 11.1.2).

It is still possible to use the absolute serial interface in the red range, but not

recommended.

AS5043

Data Sheet – Mode Input Pin

www.austriamicrosystems.com Revision 1.80 8 – 36

9 Mode Input Pin

The absolute angular position is sampled at a rate of 10.4kHz (t=96µs) in fast mode and at a rate of 2.6kHz (t=384µs) in

slow mode.

These modes are selected by pin MODE (#2) during the power up of the AS5043. This pin activates or deactivates an

internal filter, which is used to reduce the digital jitter and consequently the analog output noise.

Activating the filter by pulling Mode = LOW reduces the transition noise to <0.03° rms. At the same time, the sampling

rate is reduced to 2.6kHz and the signal propagation delay is increased to 384µs. This mode is recommended for high

precision, low speed and ≤360° applications.

Deactivating the filter by setting Mode = HIGH increases the sampling rate to 10.4kHz and reduces the signal propagation

delay to 96µs. The transition noise will increase to <0.06° rms. This mode is recommended for higher speed and full scale

= 360° applications.

Switching the MODE pin affects the following parameters:

Table 4: Mode Pin Settings

Parameter Slow Mode

(Pin MODE = 0) Fast Mode

(Pin MODE = 1)

Sampling rate 2.61 kHz

(383µs)

10.42 kHz

(95.9µs)

Transition noise (1 sigma) ≤ 0.03° rms ≤ 0.06° rms

Propagation delay 384µs 96µs

Startup time 20ms 80ms

The MODE pin should be set at power-up. A change of the mode during operation is not allowed.

AS5043

Data Sheet – Daisy Chain Mode

www.austriamicrosystems.com Revision 1.80 9 – 36

10 Daisy Chain Mode

The Daisy Chain Mode allows connection of several AS5043’s in series, while still keeping just one digital input for data

transfer (see “Data IN” in Figure 6 ). This mode is accomplished by connecting the data output (DO; pin 9) to the data

input (PROG; pin 8) of the subsequent device. An RC filter must be implemented between each PROG pin of device n

and DO pin of device n+1, to prevent then encoders to enter the alignment mode, in case of ESD discharge, long cables,

not conform signal levels or shape. Using the values R=100R and C=1nF allow a max. CLK frequency of 1MHz on the

whole chain. The serial data of all connected devices is read from the DO pin of the first device in the chain. The length of

the serial bit stream increases with every connected device, it is

n * (16+1) bits:

e.g. 34 bit for two devices, 51 bit for three devices, etc…

The last data bit of the first device (Parity) is followed by a dummy bit and the first data bit of the second device (D9),

etc… (see Figure 7).

Figure 6: Daisy Chain Hardware Configuration

CSn

PROG

CLK

CSn

CLK

CSn

CLK

PROG

CSn

CLK

PROG

100R 100R

1nF 1nF

GND GND GND

MCU AS5043 AS5043 AS5043

Figure 7: Daisy Chain Data Transfer Timing Di agram

Even

PAR

CSn

CLK

DO D9 D8 D7 D6 D5 D4 D3 D2 D1 D0

18 16

COF LINOCF Mag

INC

Mag

DEC

tCLK FE

Angular Position Data Status Bits

TCLK/2

tDO active tDO valid

D9 D8 D7

1st Device 2nd Device

Angular Position Data

AS5043

Data Sheet – Analog Output

www.austriamicrosystems.com Revision 1.80 10 – 36

11 Analog Output

The analog output Vout provides an analog voltage that is proportional to the angle of the rotating magnet and ratiometric

to the supply voltage VDD5V (max.5.5V). It can source or sink currents up to ±1mA in normal operation (up to 66mA short

circuit current).

The analog output block consists of a digital angular range selector, a 10-bit Digital-to-Analog converter and an OPAMP

buffer stage (see Figure 14).

The digital range selector allows a preselection of the angular range for 360°,180°,90° or 45° (see Table 5). Fine-tuning of

the angular range can be accomplished by adjusting the gain of the OPAMP buffer stage.

The reference voltage for the Digital-to-Analog converter (DAC) can be taken internally from VDD5V / 2. In this mode, the

output voltage is ratiometric to the supply voltage.

Alternatively, an external DAC reference can be applied at pin DACref (#9). In this mode, the analog output is ratiometric

to the external reference voltage.

An on-chip diagnostic feature turns the analog output off in case of an error (broken supply or magnetic field out of range;

see Table 3).

The DAC output can be accessed directly at pin #10 DACout.

The addition of an OPAMP to the DAC output allows a variety of user configurable options, such as variable output

voltage ranges and variable output voltage versus angle response. By adding an external transistor, the analog voltage

output can be buffered to allow output currents up to hundred milliamperes or more.

Furthermore, the OPAMP can be configured as constant current source.

As an OTP option, the DAC can be configured to 2 different output ranges:

a) 0……100% VDACref. The reference point may be either taken from VDD5V/2 or from the external DACref input. The

0…100% range allows easy replacement of potentiometers. Due to the nature of rail-to-rail outputs, the linearity will

degrade at output voltages that are close to the supply rails.

b) 10…..90% VDACref. This range allows better linearity, as the OPAMP is not driven to the rails. Furthermore, this mode

allows failure detection, when the analog output voltage is outside of the normal operating range of 10…90%VDD, as in

the case of broken supply or when the magnetic field is out of range and the analog output is turned off.

11.1 Analog Output Voltage Modes

The Analog output voltage modes are programmable by OTP. Depending on the application, the analog output can be

selected as rail-to-rail output or as clamped output with 10%-90% VDD5V.

The output is ratiometric to the supply voltage (VDD5V), which can range from 3.0V to 5.5V. If the DAC reference is

switched to an external reference (pin DACref), the output is ratiometric to the external reference.

11.1.1 Full Scale Mode

This output mode provides a ratiometric DAC output of (0% to 100%)x Vref *), amplified by the OPAMP stage (default =

internal 2x gain, see Figure 14)

Figure 8: Analog Output, Full Scal e Mode (show n for 360°mode)

Note: For simplification, Figure 8 describes

a linear output voltage from rail to rail (0V to

VDD). In practice, this is not feasible due to

saturation effects of the OPAMP output

driver transistors. The actual curve will be

rounded towards the supply rails (as

indicated in Figure 8)

Note: Figure 8 and are shown for 360°

operation. See Table 5 (page 16) for further

angular range programming options.

Vref

0° 90° 180° 270° 360°

analog

output

voltage

angle

100%

AS5043

Data Sheet – Analog Output

www.austriamicrosystems.com Revision 1.80 11 – 36

Vref

0° 90° 180° 270°

360°

analog

output

voltage

angle

100%

90%

10%

normal

operating

area

In an error case, the output

voltage is in the grey area

11.1.2 Diagnostic Output Mode

Figure 9: Diagnostic Output Mode

In Diagnostic Output Mode (see Figure 9)

the analog output of the internal DAC ranges

from 10% - 90% Vref*). In an error case,

either when the supply is interrupted or

when the magnetic field is in the “red” range,

(see Table 3) the output is switched to 0V

and thus indicates the error condition.

It is possible to enable the analog output

permanently (it will not be switched off even

if the magnetic field is out of range). To

enable this feature an OTP bit in the factory setting must be set. The corresponding bit is FS6. See application note

AS5040-20 (Extended features of OTP programming) for further details. The application note is available for download at

the austriamicrosystems website.

The analog and digital outputs will have the following conditions:

Status DAC Output Voltage SSI Digital Output

Normal operation 10% - 90% Vref*) #0 - #1023 (0°-360°), MagRngn = 1

Magnetic field out of range < 10% Vref*),

DAC output is switched to 0V

#0 - #1023 (0°-360°)

out of range is signaled in status bits:

MagInc=MagDec=LIN=1, MagRngn= 0

Broken positive power supply

(VOUT pull down resistor at receiving side)

< 10% VDD**)

Broken power supply ground

(VOUT pull down resistor at receiving side)

< 10% VDD**)

Broken positive power supply

(VOUT pull up resistor at receiving side)

> 90% VDD**)

Broken power supply ground

(VOUT pull up resistor at receiving side)

> 90% VDD**)

with pull down resistor at DO (receiving

side), all bits read by the SSI will be “0”-

s, indicating a non-valid output

*) Vref = internal: ½ * VDD5V (pin #16) or external: VDACref (pin#9), depending on Ref_extEN bit in OTP (0=int., 1=ext.)

**) VDD = positive supply voltage at receiving side (3.0 – 5.5V)

AS5043

Data Sheet – Programming the AS5043

www.austriamicrosystems.com Revision 1.80 12 – 36

12 Programming the AS5043

After power-on, programming the AS5043 is enabled with the rising edge of CSn and Prog = logic high. 16 bit

configuration data must be serially shifted into the OTP register via the Prog-pin. The first “CCW” bit is followed by the

zero position data (MSB first) and the Analog Output Mode setting as shown in Table 5. Data must be valid at the rising

edge of CLK (see Figure 10). Following this sequence, the voltage at pin Prog must be raised to the programming voltage

VPROG (see Figure 10). 16 CLK pulses (tPROG) must be applied to program the fuses. To exit the programming mode, the

chip must be reset by a power-on-reset. The programmed data is available after the next power-up.

Note: During the programming process, the transitions in the programming current may cause high voltage spikes

generated by the inductance of the connection cable. To avoid these spikes and possible damage to the IC, the

connection wires, especially the signals PROG and VSS must be kept as short as possible. The maximum wire length

between the VPROG switching transistor and pin PROG (see Figure 12) should not exceed 50mm (2 inches).

To suppress eventual voltage spikes, a 10nF ceramic capacitor should be connected close to pins PROG and VSS. This

capacitor is only required for programming, it is not required for normal operation. The clock timing tclk must be selected at

a proper rate to ensure that the signal PROG is stable at the rising edge of CLK (see Figure 10). Additionally, the

programming supply voltage should be buffered with a 10µF capacitor mounted close to the switching transistor. This

capacitor aids in providing peak currents during programming. The specified programming voltage at pin PROG is 7.3 –

7.5V (see section 19.7). To compensate for the voltage drop across the VPROG switching transistor, the applied

programming voltage may be set slightly higher (7.5 - 8.0V, see Figure 12).

OTP Register Contents:

CCW Counter Clockwise Bit

ccw=0 – angular value increases with clockwise rotation

ccw=1 – angular value increases with counterclockwise rotation

Z [9:0]: Programmable Zero / Index Position

FB_intEN: OPAMP gain setting: 0=external, 1=internal

RefExtEN: DAC reference: 0=internal, 1=external

ClampMd EN: Analog output span: 0=0-100%,

1=10-90%*VDD

Output Range (OR0, OR1):

Analog Output Range Selection

[1:0] 00 = 360° 01 = 180°

10 = 90° 11 = 45°

Figure 10: Programming Access – OTP Write Cycl e (section of)

CCW Z9 Z8 Z7 Z6 Z5 Z4 Z3 Z2 Z1 Z0 FB_int

RefExt

Clamp

Md En

Output

Range1

Analog Modes

Zero Position

tDatain valid

tProg enable

CSn

Prog Output

Range0

1168

CLKPROG

tDatain

tclk

see text

AS5043

Data Sheet – Programming the AS5043

www.austriamicrosystems.com Revision 1.80 13 – 36

Figure 11: Complete OTP Programming Sequence

Data

CSn

Prog

CLKPROG

7.5V

VDD

tLoad PROG tPROG finished

Write Data Power OffProgramming Mode

tPROG

tPrgH

VProgOff

tPrgR

116

Figure 12: OTP Programming Hardware Connecti on of AS5043 (shown with AS5043 de moboard)

USB

12.1 Zero Position Programming

The AS5043 allows easy assembly of the system, as the actual angle of the magnet does not need to be considered. By

OTP programming, any position can be assigned as the new permanent zero position with an accuracy of 0.35° (all

modes).

Using the same procedure, the AS5043 can be calibrated to assign a given output voltage to a given angle. With this

approach, all offset errors (DAC + OPAMP) are also compensated for the calibrated position.

Essentially, for a given mechanical position, the angular measurement system is electrically rotated (by changing the

Zero Position value in the OTP register), until the output matches the desired mechanical position.

The example in Figure 13 below shows a configuration for 5V supply voltage and 10%-90% output voltage range. It

adjusted by Zero Position Programming to provide an analog output voltage of 2.0 Volts at an angle of 180°. The slope of

the curve may be further adjusted by changing the gain of the OPAMP output stage and by selecting the desired angular

range (360°/180°/90°/45°).

AS5043

Data Sheet – Programming the AS5043

www.austriamicrosystems.com Revision 1.80 14 – 36

Figure 13: Zero Position Programming (shown for 360° mode)

VDD5V

0° 90° 180° 270° 360°

analog

output

voltage

Mechanical

angle

the output can be electrically rotated to

match a given output voltage to any

mechanical position

12.2 Analog Mode Programming

The analog output can be configured in many ways:

It consists of three major building blocks,

a digital range preselector,

a 10-bit Digital-to-Analog-Converter (DAC)

and an OP-AMP buffer stage.

In the default configuration (all OTP bits = 0), the analog output is set for 360° operation, internal DAC reference

(VDD5V/2), external OPAMP gain, 0-100% ratiometric to VDD5V.

Shown below is a typical example for a 0°-360° range, 0-5V output. The complete application requires only one external

component, a buffer capacitor at VDD3V3 and has only 3 connections VDD, VSS and Vout (connectors 1-3).

Note: the default setting for the OPA MP feedback path is:FB_intEn=0=external . The external resistors R f and Rg must be

installed. In the programmed state (FB_intEn=1=internal), these resistors do not need to be installed as the feedback

path is internal (Rf_int and Rg_i nt).

AS5043

Data Sheet – Programming the AS5043

www.austriamicrosystems.com Revision 1.80 15 – 36

Figure 14: Analog Output Block Di agram

AS5043

Range

Selector

OR1 OR0

ClampMdEN

0 360° 0

0 180° 1

1 90° 0

1 45° 1

10bit

digital

REF_extEN

0=int

DACref VDD5V

0 - 100% VDD5V /2

LDO

3.3V VDD3V3

916

DACout

VOUT 12

Rf_int

30k

Rg_int

30k

10bit

analog

FB 11

FB_intEN 1=int

Gain = 2x (int)

<100pF

360°angle0

Vout

VDD

DAC

1=ext

0=ext

0= 0-100% * Vref (def.)

1= 10-90% * Vref

VDD5V / 2

Vref

VDD

VSS

1-10µF

PROGDOCLKCSn

for OTP

programming and

alignment mode

only. Leave open

or connect to VSS

if not used

Digital serial

interface, 10bit/360°.

Leave open if not

used. CSn and CLK

may also be tied to

VSS if not used

346 8

MagRngn Mode

Magnetic field range alarm. Active

low. Leave open or connect to

VSS if not used

Mode pin.

Default = open

(low noise)

OP-Amp feedback pin.

Leave open if not used.

DAC output pin.

Leave open if not used

External DAC reference pin.

Leave open or connect to

VSS if not used

Test pins.

Leave open

1Connect pins 15 and

16 for VDD= 3.0-3.6V.

Do NOT connect for

VDD = 4.5-5.5V !

from

DSP

RLmin

= 4k7

Vout

VSS

12.2.1 Angular Range Selector

The Angular Range selector allows a digital pre-selection of the angular range. The AS5043 can be configured for a full

scale angular range of 45°, 90°, 180° or 360°. In addition, the Output voltage versus angle response can be fine-tuned by

setting the gain of the OP-AMP with external resistors and the maximum output voltage can be set in the DAC.

The combination of these options allows to configure the operation range of the AS5043 for all angles up to 360° and

output voltages up to 5.5V.

The response curve for the analog output is linear for the selected range (45°/90°/180°/360°). In addition, the slope is

mirrored at 180° for 45°- and 90°- modes and has a step response at 270° for the 180°-mode. This allows the AS5043 to

be used in a variety of applications. In these three modes, the output remains at Vout,max and Vout,min to avoid a sudden

output change when the mechanical angle is rotated beyond the selected analog range. In 360°-mode, a jitter between

Vout,max and Vout,min at the 360° point is also prevented due to a hysteresis.

AS5043

Data Sheet – Programming the AS5043

www.austriamicrosystems.com Revision 1.80 16 – 36

Table 5: Digital Range Selector Programming Option

Output

Range1

Output

Range0 Mode Note

0 0

0°

256

90° 180° 270°

360°

angle*)

360° angular range (default)

1023

512 768 1024

default mode,

analog resolution= 10bit

(1024 steps) over 360°

analog step size:

1LSB = 0.35°

0 1

0° 90° 180° 270°

360°

angle

180° angular range

1023

256 512 768 1024

analog resolution= 10bit

(1024 steps) over 180°

Analog step size:

1LSB = 0.175°

1 0

0° 90° 180° 270°

360°

angle

90° angular range

1023

256 512 768 1024

analog resolution= 10bit

(1024 steps) over 90°

Analog step size:

1LSB = 0.088°

1 1

0° 90° 180°

225° 360°

angle

45° angular range

511

256 512

640 1024

128

45°

analog resolution=

9 bit (512 steps) over 45°

Analog step size:

1LSB = 0.088°

*) Note: the resolution on the di gital SSI interface i s always 10bi t (0.35°/step) over 360°, independent on anal og mode

12.3 Repeated OTP Programming

Although a single AS5043 OTP register bit can be programmed only once (from 0 to 1), it is possible to program other,

unprogrammed bits in subsequent programming cycles. However, a bit that has already been programmed should not be

programmed twice. Therefore it is recommended that bits that are already programmed are set to “0” during a

programming cycle.

12.4 Non-permanent Programming

It is also possible to re-configure the AS5043 in a non-permanent way by overwriting the OTP register.

This procedure is essentially a “Write Data” sequence (see Figure 10) without a subsequent OTP programming cycle.

The “Write Data” sequence may be applied at any time during normal operation. This configuration remains set while the

power supply voltage is above the power-on reset level (see 19.5).

See Application Note AN5000-20 for further information.

12.5 Digital-to-Analog Converter (DAC)

The DAC has a resolution of 10bit (1024 steps) and can be configured for the following options.

AS5043

Data Sheet – Programming the AS5043

www.austriamicrosystems.com Revision 1.80 17 – 36

Internal or external referen ce

The default DAC reference is the voltage at pin #16 (VDD5V) divided by 2 (see Figure 13). Using this reference, a system

that has an output voltage ratiometric to the supply voltage can be built.

Optionally, an external reference source, applied at pin#9 (DACref) can be used. This programming option is useful for

applications requiring a precise output voltage that is independent of supply fluctuations, for current sink outputs or for

applications with a dynamic reference, e.g. attenuation of audio signals.

0-100% or 10-90% full scale range

The reference voltage for the DAC is buffered internally. The recommended range for the external reference voltage is

0.2V to (VDD3V3 -0.2)V.

The DAC output voltage will be switched to 0V, when the magnetic field is out of range, when the MagInc and MagDec

indicators are both =1 and the MagRngn-pin (#1) will go low.

The default full scale output voltage range is 0-100%*VDD5V. Due to limitations in the output stage of an OP-Amp buffer,

it cannot drive the output voltage from 0-100% rail-to-rail. Without load, the minimum output voltage at 0° will be a few

millivolts higher than 0V and the maximum output voltage will be slightly lower than VDD5V. With increasing load, the

voltage drops will increase accordingly.

As a programming option, an output range of 10-90%*VDD5V can be selected. In this mode, there is no saturation at the

upper and lower output voltage limits like in the 0-100% mode and it allows failure detection as the output voltage will be

outside the 10-90% limits, when the magnetic field is in the “red” range (Vout=0V, see Table 3) or when the supply to the

chip is interrupted (Vout=0V or VDD5V).

The unbuffered output of the DAC is accessible at pin #10 (DACout). This output must not be loaded.

12.6 OP-AMP Stage

The DAC output is buffered by a non-inverting Op-Amp stage. The amplifier is supplied by VDD5V (pin #16) and can

hence provide output voltages up to 5V.

By allowing access to the inverting input of the Op-Amp and with the addition of a few discrete components it can be

configured in many ways, like high current buffer, current sink output, adjustable angle range, etc...

Per default, the gain of the Op-Amp must be set by two external resistors (see Figure 13). Optionally, the fixed internal

gain setting (2x) may be programmed by OTP, eliminating the need for external resistors.

12.6.1 Output Noise

The Noise level at the analog output depends on two states of the digital angular output:

a) the digital angular output value is stable

In this case, the output noise is the figure given as Vnoise in paragraph 19.3.6. Note that the noise level is given

for the default gain of 2x For other gains, it must be scaled accordingly.

b) the digital output is at the edge of a step

In this case, the digital output may jitter between two adjacent values. The rate of jitter is specified as transition

noise (parameter TN in paragraph 19.5). The resulting output noise is calculated by:

OPAMPnoiseVoutnoise V

VVDDTN

V,, 360 5+

∗

where:

Vnoise, Vout = noise level at pin Vout in Vrms

TN = transition noise (in °rms; see 19.5)

VDD5V = Supply voltage VDD5V in V

Vnoise,OPAMP = noise level of OPAMP

(paragraph 19.3.6) in Vrms

12.7 Application Examples

See Application Note AN5043-10 for AS5043 Application Examples.

AS5043

Data Sheet – Analog Readback Mode

www.austriamicrosystems.com Revision 1.80 18 – 36

13 Analog Readback Mode

Non-volatile programming (OTP) uses on-chip zener diodes, which become permanently low resistive when subjected to

a specified reverse current.

The quality of the programming process depends on the amount of current that is applied during the programming

process (up to 130mA). This current must be provided by an external voltage source. If this voltage source cannot

provide adequate power, the zener diodes may not be programmed properly.

In order to verify the quality of the programmed bits, an analog level can be read for each zener diode, giving an

indication whether this particular bit was properly programmed or not.

To put the AS5043 in Analog Readback Mode, a digital sequence must be applied to pins CSn, PROG and CLK as

shown in Figure 15. The digital level for this pin depends on the supply configuration (3.3V or 5V; see section 1, page 5).

The second rising edge on CSn (OutpEN) changes pin PROG to a digital output and the log. high signal at pin PROG

must be removed to avoid collision of outputs (grey area in Figure 15).

The following falling slope of CSn changes pin PROG to an analog output, providing a reference voltage Vref, that must be

saved as a reference for the calculation of the subsequent programmed and unprogrammed OTP bits.

Following this step, each rising slope of CLK outputs one bit of data in the reverse order as during programming.

(see Figure 15: Output Range OR0 and -1 , ClampMdEn, RefExtEn, FB_IntEn, Z0…Z9, ccw)

During analog readback, the capacitor at pin PROG (see Figure 12) should be removed to allow a fast readout rate.

The measured analog voltage for each bit must be subtracted from the previously measured Vref, and the resulting value

gives an indication on the quality of the programmed bit: a reading of <100mV indicates a properly programmed bit and a

reading of >1V indicates a properly unprogrammed bit.

A reading between 100mV and 1V indicates a faulty bit, which may result in an undefined digital value, when the OTP is

read at power-up.

Following the 16th clock (after reading bit “ccw”), the chip must be reset by disconnecting the power supply.

Figure 15: Analog OTP Register R ead

In t e r n al

test bit

digit al Vun

rammed

CSn

CLK 1 16

PROG

ProgEN

OR1OR0

A n a log Re a d ba ck Data at PR OG OutpEN

tLoadProg CLK

read

Prog changes to Output

Vref

Power-on-

Reset;

cycle supply

RefExt

Clamp

MdEN Z6 Z5 Z8 Z7 ccw Z9

AS5043

Data Sheet – Alignment Mode

www.austriamicrosystems.com Revision 1.80 19 – 36

14 Alignment Mode

The alignment mode simplifies centering the magnet over the chip to gain maximum accuracy and XY-alignment

tolerance.

This electrical centering method allows a wider XY-alignment tolerance (0.485mm radius) than mechanical centering

(0.25mm radius) as it eliminates the placement tolerance of the die within the IC package (+/- 0.235mm).

Alignment mode can be enabled with the falling edge of CSn while PROG = logic high (Figure 15). The Data bits D9-D0

of the SSI change to a 10-bit displacement amplitude output. A high value indicates large X or Y displacement, but also

higher absolute magnetic field strength. The magnet is properly aligned, when the difference between highest and lowest

value over one full turn is at a minimum.

Under normal conditions, a properly aligned magnet will result in a reading of less than 32 over a full turn.

Stronger magnets or short gaps between magnet and IC may show values larger than 32. These magnets are still

properly aligned as long as the difference between highest and lowest value over one full turn is at a minimum.

The MagInc and MagDec indicators will be = 1 when the alignment mode reading is < 32. At the same time, hardware pin

MagRngn (#1) will be pulled to VSS.

The Alignment mode can be reset to normal operation mode by a power-on-reset (cycle power supply) or by a falling

edge of CSn with PROG=low (see Figure 16).

Figure 16: Enabling the Alignment Mode Figure 17: Exiting Alignment Mode

AlignMode enabl

PROG

CSn Read-out

via SSI

2µs

min.

2µs

min.

exit AlignMode

PROG

CSn Read-out

via SSI

AS5043

Data Sheet – Choosing the Proper Magnet

www.austriamicrosystems.com Revision 1.80 20 – 36

15 Ch oosing the Prop er M agnet

Typically the magnet should be 6mm in diameter and ≥2.5mm in height. Magnetic materials such as rare earth AlNiCo,

SmCo5 or NdFeB are recommended.

The magnet’s field strength perpendicular to the die surface should be verified using a gauss-meter. The magnetic field

Bv at a given distance, along a concentric circle with a radius of 1.1mm (R1), should be in the range of ±45mT…±75mT.

(see Figure 18).

Figure 18: Typical Magnet and Magnetic Fi eld Distri buti on

Magnet axis

Vertica l field

component

(45…75m T )

360

Vertical fie ld

component

R1 co ncen t r ic ci rcl e ;

radius 1.1mm

Magnet ax is

t yp. 6mm di a m eter

S N

15.1 Physical Placement of the Magnet

The best linearity can be achieved by placing the center of the magnet exactly over the defined center of the IC package

as shown in Figure 19.

Figure 19: Defined IC C enter and Magnet D ispl acement Radius

Defined

center

2.433 mm

3.9 mm 3.9 mm

rea of recommended maximum

magnet misalignment

AS5043

Data Sheet – Choosing the Proper Magnet

www.austriamicrosystems.com Revision 1.80 21 – 36

15.1.1 Magnet Placement

The magnet’s center axis should be aligned within a displacement radius Rd of 0.25mm from the defined center of the IC

with reference to the edge of pin #1 (see Figure 19). This radius includes the placement tolerance of the chip within the

SSOP-16 package (+/- 0.235mm).

The displacement radius Rd is 0.485mm with reference to the center of the chip (see section Alignment Mode).

The vertical distance should be chosen such that the magnetic field on the die surface is within the specified limits (see

Figure 18). The typical distance “z” between the magnet and the package surface is 0.5mm to 1.8mm with the

recommended magnet (6mm x 3mm). Larger gaps are possible, as long as the required magnetic field strength stays

within the defined limits.

A magnetic field outside the specified range may still produce usable results, but the out-of-range condition will be

indicated by MagRngn (pin 1), which will be pulled low. At this condition, the angular data is still available over the digital

serial interface (SSI), but the analog output will be turned off.

Figure 20: Vertical Pl acement of the Magnet

1.282mm ± 0.15mm

0.576mm ± 0.1mm

Pac kage surfaceDie s urface

AS5043

Data Sheet – Simulation Modelling

www.austriamicrosystems.com Revision 1.80 22 – 36

16 Simulation Modelling

Figure 21: Arrangement of Hall Sensor Array on Chi p (principle)

With reference to Figure 21, a diametrically magnetized permanent magnet is placed above or below the surface of the

AS5043. The chip uses an array of Hall sensors to sample the vertical vector of a magnetic field distributed across the

device package surface. The area of magnetic sensitivity is a circular locus of 1.1mm radius with respect to the center of

the die. The Hall sensors in the area of magnetic sensitivity are grouped and configured such that orthogonally related

components of the magnetic fields are sampled differentially.

The differential signal Y1-Y2 will give a sine vector of the magnetic field. The differential signal X1-X2 will give an

orthogonally related cosine vector of the magnetic field.

The angular displacement (Θ) of the magnetic source with reference to the Hall sensor array may then be modelled by:

()

°±

−

=Θ 5.0

21 21

arctan XX YY

The ±0.5° angular error assumes a magnet optimally aligned over the center of the die and is a result of gain mismatch

errors of the AS5043. Placement tolerances of the die within the package are ±0.235mm in X and Y direction, using a

reference point of the edge of pin #1 (Figure 21).

In order to neglect the influence of external disturbing magnetic fields, a robust differential sampling and ratiometric

calculation algorithm has been implemented. The differential sampling of the sine and cosine vectors removes any

common mode error due to DC components introduced by the magnetic source itself or external disturbing magnetic

fields. A ratiometric division of the sine and cosine vectors removes the need for an accurate absolute magnitude of the

magnetic field and thus accurate Z-axis alignment of the magnetic source.

The recommended differential input range of the magnetic field strength (B(X1-X2),B(Y1-Y2)) is ±75mT at the surface of the

die. In addition to this range, an additional offset of ±5mT, caused by unwanted external stray fields is allowed.

The chip will continue to operate, but with degraded output linearity, if the signal field strength is outside the

recommended range. Too strong magnetic fields will introduce errors due to saturation effects in the internal

preamplifiers. Too weak magnetic fields will introduce errors due to noise becoming more dominant.

AS5043

Data Sheet – Failure Diagnostics

www.austriamicrosystems.com Revision 1.80 23 – 36

17 Failure Diagnostics

The AS5043 also offers several diagnostic and failure detection features:

17.1 Magnetic Field Strength Diagnosis

By software: the MagInc and MagDec status bits will both be high when the magnetic field is out of range.

By hardware: Pin #1 (MagRngn) is a logical NAND-ed combination of the MagInc and MagDec status bits. It is an open-

drain output and will be turned on (= low with external pull-up resistor) when the magnetic field is out of range.

By hardware: Pin #12 (Vout) is the analog output of the DAC and OP-Amp. The analog output will be 0V, when the

magnetic field is out of range (all analog modes).

17.2 Pow er Supply Failure Detection

By software: If the power supply to the AS5043 is interrupted, the digital data read by the SSI will be all “0”s. Data is only

valid, when bit OCF is high, hence a data stream with all “0”s is invalid. To ensure adequate low levels in the failure case,

a pull-down resistor (~10kΩ) should be added between pin DO and VSS at the receiving side

By hardware: The MagRngn pin is an open drain output and requires an external pull-up resistor. In normal operation,

this pin is high ohmic and the output is high. In a failure case, either when the magnetic field is out of range or the power

supply is missing, this output will become low. To ensure an adequate low level in case of a broken power supply to the

AS5043, the pull-up resistor (~10kΩ) must be connected to the positive supply at pin 16 (VDD5V).

AS5043

Data Sheet – Angular Output Tolerances

www.austriamicrosystems.com Revision 1.80 24 – 36

18 An gular Ou tpu t Tolerances

18.1 Accuracy; Digital Outputs

Accuracy is defined as the error between measured angle and actual angle. It is influenced by several factors:

 the non-linearity of the analog-digital converters,

 internal gain and mismatch errors,

 non-linearity due to misalignment of the magnet

As a sum of all these errors, the accuracy with centered magnet = (Errmax – Errmin)/2 is specified as better than ±0.5

degrees @ 25°C (see Figure 23).

Misalignment of the magnet further reduces the accuracy. Figure 22 shows an example of a 3D-graph displaying non-

linearity over XY-misalignment. The center of the square XY-area corresponds to a centered magnet (see dot in the

center of the graph). The X- and Y- axis extends to a misalignment of ±1mm in both directions. The total misalignment

area of the graph covers a square of 2x2 mm (79x79mil) with a step size of 100µm.

For each misalignment step, the measurement as shown in Figure 23 is repeated and the accuracy

(Errmax – Errmin)/2 (e.g. 0.25° in Figure 23) is entered as the Z-axis in the 3D-graph.

18.2 Accuracy; Analog Output

The analog output has the same accuracy as the digital output with the addition of the nonlinearities of the DAC and the

OPAMP (+/-1LSB; see Table 5 and 0).

Figure 22: Example of Linearity Error over XY Misalignment

-1000

-700

-400

-100

200

500

800

-1000

-800

-600

-400

-200

200

400

600

800

1000

Linearity Error over XY-misalignm ent [°]

The maximum non-linearity error on this example is better than ±1 degree (inner circle) over a misalignment radius of

~0.7mm. For volume production, the placement tolerance of the IC within the package (±0.235mm) must also be taken

into account.

The total nonlinearity error over process tolerances, temperature and a misalignment circle radius of 0.25mm is specified

better than ±1.4 degrees.

The magnet used for this measurement was a cylindrical NdFeB (Bomatec® BMN-35H) magnet with 6mm diameter and

2.5mm in height.

AS5043

Data Sheet – Angular Output Tolerances

www.austriamicrosystems.com Revision 1.80 25 – 36

Figure 23: Example of Linearity Error over 360°

18.3 Transition Noise

Transition noise is defined as the jitter in the transition between two steps.

Due to the nature of the measurement principle (Hall sensors + Preamplifier + ADC), there is always a certain degree of

noise involved.

This transition noise voltage results in an angular transition noise at the outputs. It is specified as 0.06 degrees rms

(1 sigma)*1 in fast mode (pin MODE = high) and 0.03 degrees rms (1 sigma)*1 in slow mode (pin MODE = low or open).

These values are the repeatability of an indicated angle at a given mechanical position.

The transition noise has different implications on the type of output that is used:

 absolute output; SSI interface:

The transition noise of the absolute output can be reduced by the user by applying an averaging of readings. An

averaging of 4 readings will reduce the transition noise by 6dB or 50%, e.g. from 0.03°rms to 0.015°rms (1

sigma) in slow mode

 analog output:

Ideally, the analog output should have a jitter that is less than one digit. In 360° mode, both fast or slow mode

may be selected for adequate low jitter.

In 180°, 90° or 45° mode, where the step sizes are smaller, slow mode should be selected to reduce the output

jitter.

*1: statistically, 1 sigma represents 68.27% of readings,

3 sigma represents 99.73% of readings.

18.4 High Speed Operation

18.4.1 Sampling Rate

The AS5043 samples the angular value at a rate of 10.42k samples per second (ksps) in fast mode and 2.61ksps in slow

mode.

Consequently, a new reading is performed each 96µs. (fast mode) or 384µs (slow mode).

At a stationary position of the magnet, this sampling rate creates no additional error.

Absolute Mode:

With the given sampling rates, the number of samples (n) per turn for a magnet rotating at high speed can be calculated

srpm

⋅

= for fast mode

Linearity Error with Centered Magnet [degrees]

-0.5

-0.4

-0.3

-0.2

-0.1

0.1

0.2

0.3

0.4

0.5

1 55 109 163 217 271 325 379 433 487 541 595 649 703 757 811 865 919 973

transition noise

Err max

Err min

AS5043

Data Sheet – Angular Output Tolerances

www.austriamicrosystems.com Revision 1.80 26 – 36

srpm

384

⋅

=for slow mode

In practice, there is no upper speed limit. The only restriction is that there will be fewer samples per revolution as the

speed increases.

Regardless of the rotational speed, the absolute angular value is always sampled at the highest resolution.

Table 6: Speed Performance

Fast Mode

(Pin Mode = 1)

Slow Mode

(Pin Mode = 0 or open)

610rpm = 1024 samples / turn 610rpm = 256 samples / turn

1220rpm = 512 samples / turn 1220rpm = 128 samples / turn

2441rpm = 256 samples / turn 2441rpm = 64 samples / turn

etc… etc…

18.5 Output Delays

The propagation delay is the delay between the time that the sample is taken until it is available as angular data. This

delay is 96µs in fast mode (pin Mode = high) and 384µs in slow mode (pin Mode = low or open).

The analog output produces no further delay, the output voltage will be updated as soon as it is available. Using the SSI

interface for data transmission, an additional delay must be considered, caused by the asynchronous sampling

(0….1/fsample) and the time it takes the external control unit to read and process the angular data from the AS5043.

18.5.1 Angular Error Caused by Propagation Delay

A rotating magnet will cause an angular error caused by the propagation delay.

This error increases linearly with speed:

delayprrpmesampling .6(deg) ∗∗=

where esampling = angular error [°]

rpm = rotating speed [rpm]

prop.delay = propagation delay [seconds]

Note: since the propagation delay is known, it can be automatically compensated by the control unit processing the data

from the AS5043.

18.6 Internal Timing Tolerance

The AS5043 does not require an external ceramic resonator or quartz. All internal clock timings for the AS5043 are

generated by an on-chip RC oscillator. This oscillator is factory trimmed to ±5% accuracy at room temperature (±10%

over full temperature range). This tolerance influences the ADC sampling rate:

18.6.1 Absolute Output; SSI Interface

A new angular value is updated every

96µs +/- 5% (Mode = 1) or

384µs +/- 5% (Mode = 0 or open)

AS5043

Data Sheet – Angular Output Tolerances

www.austriamicrosystems.com Revision 1.80 27 – 36

18.7 Temperature

18.7.1 Magnetic Temperature Coefficient

One of the major benefits of the AS5043 compared to linear Hall sensors is that it is much less sensitive to temperature.

While linear Hall sensors require a compensation of the magnet’s temperature coefficients, the AS5043 automatically

compensates for the varying magnetic field strength over temperature. The magnet’s temperature drift does not need to

be considered, as the AS5043 operates with magnetic field strengths from ±45…±75mT.

Example:

A NdFeB magnet has a field strength of 75mT @ –40°C and a temperature coefficient of -0.12% per Kelvin. The

temperature change is from –40° to +125° = 165K.

The magnetic field change is: 165 x -0.12% = -19.8%, which corresponds to 75mT at –40°C and 60mT at 125°C .

The AS5043 can compensate for this temperature related field strength change automatically, no user adjustment is

required.

18.7.2 Accuracy over Temperature

The influence of temperature in the absolute accuracy is very low. While the accuracy is ≤ ±0.5° at room temperature, it

may increase to ≤±0.9° due to increasing noise at high temperatures.

18.7.3 Timing Tolerance over Temperature

The internal RC oscillator is factory trimmed to ±5%. Over temperature, this tolerance may increase to ±10%. Generally,

the timing tolerance has no influence in the accuracy or resolution of the system, as it is used mainly for internal clock

generation.

AS5043

Data Sheet – Electrical Characteristics

www.austriamicrosystems.com Revision 1.80 28 – 36

19 Electrical Characteristics

19.1 Absolute Maximum Ratings (non operating)

Stresses beyond those listed under “Absolute Maximum Ratings“ may cause permanent damage to the device. These are

stress ratings only. Functional operation of the device at these or any other conditions beyond those indicated under

“Operating Conditions” is not implied. Exposure to absolute maximum rating conditions for extended periods may affect

device reliability.

Parameter Symbol Min Max Unit Note

VDD5V -0.3 7 V Pin VDD5V

DC supply voltage VDD3V3 5 V Pin VDD3V3

-0.3 VDD5V +0.3 Pins MagRngn, Mode, CSn, CLK, DO,

DACout, FB, Vout

-0.3 5 Pin DACref

Input pin voltage Vin

-0.3 7.5

Pin PROG_DI

Input current (latchup immunity) Iscr -100 100 mA Norm: JEDEC 78

Electrostatic discharge ESD ± 2 kV Norm: MIL 883 E method 3015

Storage temperature Tstrg -55 125 °C Min – 67°F ; Max +257°F

Body temperature (Lead-free

package) TBody 260 °C

t=20 to 40s, Norm: IPC/JEDEC

J-Std-020C

Lead finish 100% Sn “matte tin”

Humidity non-condensing H 5 85 %

19.2 Operating Conditions

Parameter Symbol Min Typ Max Unit Note

Ambient temperature Tamb -40 125 °C -40°F…+257°F

Supply current Isupp 16 21 mA

Supply voltage at pin VDD5V

Voltage regulator output voltage at pin

VDD3V3

VDD5V

VDD3V3

4.5

3.0

5.0

3.3

5.5

3.6

V 5V Operation

Supply voltage at pin VDD5V

Supply voltage at pin VDD3V3

VDD5V

VDD3V3

3.0

3.3

3.6

3.3V Operation

(pin VDD5V and VDD3V3 connected)

19.3 DC Characteristics for Digital Inputs and Outputs

19.3.1 CMOS Schmitt-Trigger Inputs: CLK, CSn (internal Pull-up), Mode (internal Pull-down)

(operating conditions: Tamb = -40 to +125°C, VDD5V = 3.0-3.6V (3V operation) VDD5V = 4.5-5.5V (5V operation) unless otherwise noted)

Parameter Symbol Min Max Unit Note

High level input voltage VIH 0.7 * VDD5V V Normal operation

Low level input voltage VIL 0.3 * VDD5V V

Schmitt Trigger hysteresis VIon- VIoff 1 V

-1 1 Pin CLK, VDD5V = 5.0V Input leakage current

Pull-up low level input current

Pull-down high level input current

ILEAK

IiL

IiH

-30

-100

100

µA Pin CSn, VDD5V= 5.0V

Pin Mode, VDD5V= 5.0V

AS5043

Data Sheet – Electrical Characteristics

www.austriamicrosystems.com Revision 1.80 29 – 36

19.3.2 CMOS Input: Program Input (Prog)

(operating conditions: Tamb = -40 to +125°C, VDD5V = 3.0-3.6V (3V operation) VDD5V = 4.5-5.5V (5V operation) unless

otherwise noted)

Parameter Symbol Min Max Unit Note

High level input voltage VIH 0.7 * VDD5V 5 V

High level input voltage VPROG See “programming

conditions” V During programming

Low level input voltage VIL 0.3 * VDD5V V

Pull-down high level input current IiL 100 µA VDD5V: 5.5V

19.3.3 CMOS Output Open Drain: MagRngn

(operating conditions: Tamb = -40 to +125°C, VDD5V = 3.0-3.6V (3V operation) VDD5V = 4.5-5.5V (5V operation) unless

otherwise noted)

Parameter Symbol Min Max Unit Note

Low level output voltage VOL VSS+0.4 V

Output current IO 4

2 mA VDD5V: 4.5V

VDD5V: 3V

Open drain leakage current IOZ 1 µA

19.3.4 Tristate CMOS Output: DO

(operating conditions: Tamb = -40 to +125°C, VDD5V = 3.0-3.6V (3V operation) VDD5V = 4.5-5.5V (5V operation) unless otherwise noted)

Parameter Symbol Min Max Unit Note

High level output voltage VOH VDD5V –0.5 V

Low level output voltage VOL VSS+0.4 V

Output current IO 4

VDD5V: 4.5V

VDD5V: 3V

Tri-state leakage current IOZ 1 µA

19.3.5 Digital-to-Analog Converter

Parameter Symbol Min Typ Max Unit Note OTP Setting

Resolution 10

bit

Output range VOUTM1 0 Vref V 0……100% Vref (default) ClampMdEn = 0

(default)

OUTM2 0.10 *Vref 0.90 *Vref V 10…..90% Vref ClampMdEn = 1

Output resistance ROut,DAC 8 kΩ Unbuffered Pin DACout (#10)

0.2 VDD3V3 - 0.2 V DAC reference = external:

Pin: DACref (#9) RefExt EN = 1

DAC reference

voltage (DAC full

scale range)

Vref

VDD5V / 2 V DAC reference = internal RefExtEn = 0

(default)

Integral non-

linearity INLDAC +/- 1.5 LSB

Differential non-

linearity DNLDAC +/- 0.5 LSB

Non-Linearity of DAC and

OPAMP; -40….+125°C,

for all analog modes:

1LSB = Vref / 1024

1 LSB All analog modes

Analog output

hysteresis Hyst 2 LSB At 360°-0° transition,

360° mode only

OR1,OR0 = 00

(default)

AS5043

Data Sheet – Electrical Characteristics

www.austriamicrosystems.com Revision 1.80 30 – 36

19.3.6 OPAMP Output Stage

Parameter Symbol Min Typ Max Unit Note

Power Supply Range VDD5V 3.0 5.5 V

Parallel Load

Capacitance CL 100 pF

Parallel Load Resistance RL 4.7 kΩ 3.3V operation

Open Loop Gain A0 92 130 144 dB

Offset Voltage RTI VosOP -5 5 mV 3 sigma

Output Range Low VoutL 0.05 *

VDD5V V

Output Range High VoutH 0.95 *

VDD5V V

Linear range of analog output

Current capability sink Isink 4.8 50 mA

Permanent short circuit current:

Vout to VDD5V

Current capability source Isource 4.6 66 mA

Permanent short circuit current:

Vout to VSS

Output noise Vnoise 160 220 490 µVrms Over full temperature range;

BW= 1Hz…10MHz,Gain = 2x

2 Internal; OTP: FB_int EN = 1

OPAMP gain (non-

inverting) Gain 1 4

External OTP: FB_int EN = 0

(default)

With external resistors, pins Vout

[#12] and FB [#11]: see Figure 14

19.4 Magnetic Input Specification

(operating conditions: Tamb = -40 to +125°C, VDD5V = 3.0-3.6V (3V operation) VDD5V = 4.5-5.5V (5V operation) unless

otherwise noted)

Two-pole cylindrical diametrically magnetised source:

Parameter Symbol Min Typ Max Unit Note

Diameter dmag 4 6 mm

Thickness tmag 2.5 mm

Recommended magnet: Ø 6mm x 2.5mm for

cylindrical magnets

Magnetic input field

amplitude Bpk 45

75 mT

Required vertical component of the magnetic

field strength on the die’s surface, measured

along a concentric circle with a radius of 1.1mm

Magnetic offset Boff ± 10 mT Constant magnetic stray field

Field non-linearity 5 % Including offset gradient

fmag_abs 10 Hz

Absolute mode: 600 rpm @ readout of 1024

positions (see table 6) Input frequency

(rotational speed of

magnet) fmag_inc

166 Hz

Incremental mode: no missing pulses at

rotational speeds of up to 10,000 rpm (see

table 6)

Displacement radius Disp 0.25 mm

Max. offset between defined device center and

magnet axis

-0.12 NdFeB (Neodymium Iron Boron)

Recommended magnet

material and

temperature drift

-0.035 %/K SmCo (Samarium Cobalt)

AS5043

Data Sheet – Electrical Characteristics

www.austriamicrosystems.com Revision 1.80 31 – 36

19.5 Electrical System Specifications

(operating conditions: Tamb = -40 to +125°C, VDD5V = 3.0-3.6V (3V operation) VDD5V = 4.5-5.5V (5V operation)

unless otherwise noted)

Parameter Symbol Min Typ Max Unit Note

Resolution* RES 10 bit 0.352 deg

Integral non-linearity

(optimum) * INLopt ± 0.5 deg

Maximum error with respect to the best line

fit. Verified at optimum magnet placement,

Tamb =25 °C.

Integral non-linearity

(optimum) * INLtemp ± 0.9 deg

Maximum error with respect to the best line

fit. Verified at optimum magnet placement ,

Tamb = -40 to +125°C

Integral non-linearity* INL ± 1.4 deg

Best line fit = (Errmax – Errmin) / 2

Over displacement tolerance with 6mm

diameter magnet, Tamb = -40 to +125°C

Differential non-linearity* DNL ±

0.176 deg 10bit, no missing codes

0.06 1 sigma, fast mode (pin MODE = 1)

Transition noise* TN

0.03

Deg

RMS 1 sigma, slow mode (pin MODE=0 or open)

Power-on reset thresholds

On voltage; 300mV typ.

hysteresis

Off voltage; 300mV typ.

hysteresis

Von

Voff

1,37

1.08

2.2

1.9

2.9

2.6

DC supply voltage 3.3V (VDD3V3)

20 fast mode (pin MODE=1)

Power-up time,

Until offset compensation

finished, OCF = 1, Angular

Data valid

tPwrUp

slow mode (pin MODE=0 or open)

96 fast mode (pin MODE=1)

System propagation delay

absolute output : delay of

ADC and DSP

tdelay

384 µs slow mode (pin MODE=0 or open)

2.48 2.61 2.74

Tamb = 25°C, slow mode (pin MODE=0 or

open)

Internal sampling rate for

absolute output: fS,mode0

2.35 2.61 2.87

kHz Tamb = -40 to +125°C, slow mode (pin

MODE=0 or open)

9.90 10.42 10.94 Tamb = 25°C, fast mode (pin MODE = 1)

Internal sampling rate for

absolute output fS,mode1

9.38 10.42 11.46

kHz Tamb = -40 to +125°C, : fast mode

(pin MODE = 1)

Read-out frequency CLK >0 1 MHz Max. clock frequency to read out serial data

*) digital interface

AS5043

Data Sheet – Electrical Characteristics

www.austriamicrosystems.com Revision 1.80 32 – 36

Figure 24: Integral and Differenti al Non-Linearity (exaggerated curve)

80° 360 °

0°

512

1023

α10bit code

0.35°INL

Ideal cu rve

Actual curv e

512

1023

DNL+1LSB

[degrees]

Integral Non-Linearity (INL) is the maximum deviation between actual position and indicated position.

Differential Non-Linearity (DNL) is the maximum deviation of the step length from one position to the next.

Transition Noise (TN) is the repeatability of an indicated position.

19.6 Timing Characteristics

Synchronous Serial Interface (SSI)

(operating conditions: Tamb = -40 to +125°C, VDD5V = 3.0-3.6V (3V operation) VDD5V = 4.5-5.5V (5V operation) unless

otherwise noted)

Parameter Symbol Min Typ Max Unit Note

Data output activated

(logic high) t DO active 100 ns Time between falling edge of CSn and data

output activated

First data shifted to output

Time between falling edge of CSn and first

falling edge of CLK

Start of data output T CLK / 2 500 ns Rising edge of CLK shifts out one bit at a time

Data output valid t DO valid 413 ns

Time between rising edge of CLK and data

output valid

Data output tristate t DO tristate 100 ns After the last bit DO changes back to “tristate”

Pulse width of CSn t CSn 500 ns

CSn = high; To initiate read-out of next

angular position

Read-out frequency fCLK >0 1 MHz Clock frequency to read out serial data

19.7 Programming Conditions

(operating conditions: Tamb = -40 to +125°C, VDD5V = 3.0-3.6V (3V operation) VDD5V = 4.5-5.5V (5V operation) unless

otherwise noted)

Parameter Symbol Min Typ Max Unit Note

Programming enable time t Prog enable 2 µs

Time between rising edge at Prog

pin and rising edge of CSn

Write data start t Data in 2 µs

Write data valid t Data in valid 250 ns

Write data at the rising edge of

CLKPROG

AS5043

Data Sheet – Electrical Characteristics

www.austriamicrosystems.com Revision 1.80 33 – 36

Parameter Symbol Min Typ Max Unit Note

Load programming data t Load PROG 3 µs

Rise time of VPROG before CLK

PROG t PrgR 0 µs

Hold time of VPROG after CLK

PROG t PrgH 0 5 µs

Write data – programming

CLK PROG

CLK PROG 250 kHz

CLK pulse width t PROG 1.8 2 2.2 µs

During programming; 16 clock

cycles

Hold time of Vprog after

programming t PROG finished 2 µs

Programmed data is available after

next power-on

Programming voltage V PROG 7.3 7.4 7.5 V Must be switched off after zapping

Programming voltage off level V ProgOff 0 1 V

Line must be discharged to this

level

Programming current I PROG 130 mA During programming

Analog read CLK CLKAread 100 kHz Analog readback mode

Programmed zener voltage

(log.1) Vprogrammed 100 mV

Unprogrammed zener voltage

(log. 0) Vunprogrammed 1 V

VRef-VPROG during analog readback

mode (see 13)

AS5043

Data Sheet – Package Drawings and Markings

www.austriamicrosystems.com Revision 1.80 34 – 36

20 Packag e Drawings and M arkings

Figure 25: 16-Lead Shrink Small Outline Package SSOP-16

Dimensions

mm inch

Symbol Min Typ Max Min Typ Max

A 1.73 1.86 1.99 .068 .073 .078

A1 0.05 0.13 0.21 .002 .005 .008

A2 1.68 1.73 1.78 .066 .068 .070

b 0.25 0.315 0.38 .010 .012 .015

c 0.09 - 0.20 .004 - .008

D 6.07 6.20 6.33 .239 .244 .249

E 7.65 7.8 7.9 .301 .307 .311

E1 5.2 5.3 5.38 .205 .209 .212

e 0.65 .0256

K 0° - 8° 0° - 8°

L 0.63 0.75 0.95 .025 .030 .037

21 Packing Options

Delivery: Tape and Reel (1 reel = 2000 devices)

Tubes (1 box = 100 tubes á 77 devices)

Order # AS5043ASSU for delivery in tubes

Order # AS5043ASST for delivery in tape and reel

AYWWIZZ

AS5043

Marking: AYWWIZZ

A: Pb-Free Identifier

Y: Last Digit of Manufacturing Year

WW: Manufacturing Week

I: Plant Identifier

ZZ: Traceability Code

JEDEC Package Outline Standard:

MO - 150 AC

Thermal Resistance Rth(j-a):

typ. 151 K/W in still air, soldered on PCB

IC’s marked with a white dot or the letters

“ES” denote Engineering samples

AS5043

Data Sheet – Recommended PCB Footprint

www.austriamicrosystems.com Revision 1.80 35 – 36

22 Recommended PCB Footprint

Recommended Footpri nt Data

mm inch

A 9.02 0.355

B 6.16 0.242

C 0.46 0.018

D 0.65 0.025

E 5.01 0.197

AS5043

Data Sheet – Contact Information

www.austriamicrosystems.com Revision 1.80 36 – 36

Copyrights

stored, or used without the prior written consent of the copyright owner.

All products and companies mentioned are trademarks or registered trademarks of their respective companies.

This product is protected by U.S. Patent No. 7,095,228.

Disclaimer

Devices sold by austriamicrosystems AG are covered by the warranty and patent indemnification provisions appearing in

its Term of Sale. austriamicrosystems AG makes no warranty, express, statutory, implied, or by description regarding the

information set forth herein or regarding the freedom of the described devices from patent infringement.

austriamicrosystems AG reserves the right to change specifications and prices at any time and without notice. Therefore,

prior to designing this product into a system, it is necessary to check with austriamicrosystems AG for current information.

This product is intended for use in normal commercial applications. Applications requiring extended temperature range,

unusual environmental requirements, or high reliability applications, such as military, medical life-support or lifesustaining

equipment are specifically not recommended without additional processing by austriamicrosystems AG for each

application.

The information furnished here by austriamicrosystems AG is believed to be correct and accurate. However,

austriamicrosystems AG shall not be liable to recipient or any third party for any damages, including but not limited to

personal injury, property damage, loss of profits, loss of use, interruption of business or indirect, special, incidental or

consequential damages, of any kind, in connection with or arising out of the furnishing, performance or use of the

technical data herein. No obligation or liability to recipient or any third party shall arise or flow out of austriamicrosystems

AG rendering of technical or other services.

Contact Information

Headquarters

austriamicrosystems AG

A-8141 Schloss Premstaetten, Austria

Tel: +43 (0) 3136 500 0

Fax: +43 (0) 3136 525 01

For Sales Offices, Distributors and Representatives, please visit:

http://www.austriamicrosystems.com/contact