DS1845B-010/T&R - Maxim Integrated Products, Inc.

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FEATURES

§ Two linear taper potentiometers

- DS1845-010 one 10k, 100 position &

one 10k, 256 position

- DS1845-050 one 10k, 100 position &

one 50k, 256 postition

- DS1845-100 one 10k, 100 position &

one 100k, 256 position

§ 256 bytes of EEPROM memory

§ Access to data and potentiometer control via

an I2C compatible 2-wire interface

§ External Write Enable pin to protect data and

potentiometer settings

§ Nonvolatile wiper storage

§ Operates from 3V or 5V supplies

§ Packaging: Flip Chip Package, 16-ball

CSBGA, 14-pin TSSOP

§ Industrial operating temperature: -40ºC to

+85ºC

16-Ball CSBGA (4mm x 4mm)

14-Pin Flip Chip (100-mil x 100-mil) (Not Shown)

DESCRIPTION

The DS1845 Dual NV Potentiometer and Memory consists of one 100-position linear taper

potentiometer, one 256-position linear taper potentiometer, 256 bytes of EEPROM memory, and a 2-wire

interface. The device provides an ideal method for setting bias voltages and currents in control

applications using a minimum of circuitry. The EEPROM memory allows a user to store configuration

or calibration data for a specific system or device as well as provide control of the potentiometer wiper

settings. Any type of user information may reside in the first 248 bytes of this memory. The next two

addresses of EEPROM memory are for potentiometer settings. Access to this EEPROM is via an

industry standard 2-wire bus. The wiper position of the DS1845, as well as EEPROM data, can be

hardware write-protected using the Write Protect (WP) input pin. Up to eight DS1845s can be installed

on a single 2-wire bus. Access to an individual device is achieved by using a device address that is

determined by the logic levels of address pins A0 though A2. Additionally, the DS1845 will operate

from 3 volt or 5 volt supplies. Three package options are available: Flip Chip Package, 16-ball CSBGA

and 14-pin TSSOP.

DS1845

Dual NV Potentiomete

and Memory

www.maxim-ic.com

SDA 1 14 Vcc

SCL 2 13 H0

A0 3 12 W1

A1 4 11 H1

A2 5 10 L1

WP 6 9 W0

GND 7 8 L0

14-Pin TSSOP (173 mil)

1 2 3 4

Top View

DS1845

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PIN DESCRIPTIONS

Name TSSOP BGA Description

VCC 14 A3 Power Supply Terminal. The DS1845 will support supply

voltages ranging from +2.7V to +5.5V.

GND 7 D1 Ground Terminal.

SDA 1 B2 2-Wire serial data interface. The serial data pin is for serial data

transfer to and from the DS1845. The pin is open drain and may

be wire-ORed with other open drain or open collector interfaces.

SCL 2 A2 2-Wire Serial Clock Input. The serial clock input is used to

clock data into the DS1845 on rising edges and clock data out on

falling edges.

WP 6 C1 Write Protect Input. If set to logic 0, the data in memory and the

potentiometer wiper setting may be changed. If set to logic 1, both

the memory and the potentiometer wiper settings will be write

protected. The WP pin is pulled high internally.

A0 3 A1 Address Input. Pins A0, A1, and A2 are used to specify the

address of each DS1845 when used in a multi-dropped

configuration. Up to eight DS1845s may be addressed on a single

2-wire bus.

A1 4 B1 Address Input.

A2 5 C2 Address Input.

H0 13 A4 High terminal of Potentiometer 0. For both potentiometers, it is

not required that the high terminal be connected to a potential

greater than the low terminal. Voltage applied to the high terminal

of each potentiometer cannot exceed VCC or go below ground.

H1 11 B3 High terminal of Potentiometer 1.

L0 8 D3 Low terminal of Potentiometer 0. For both potentiometers, it is

not required that the low terminal be connected to a potential less

than the high terminal. Voltage applied to the low terminal of each

potentiometer cannot exceed VCC or go below ground.

L1 10 C4 Low terminal of Potentiometer 1.

W0 9 D4 Wiper terminal of Pot 0. The wiper position of Potentiometer 0

is determined by the byte at EEPROM memory location F9h.

Voltage applied to the wiper terminal of each potentiometer cannot

exceed the power supply voltage, VCC, or go below ground.

W1 12 B4 Wiper terminal of Pot 1. The wiper position of Potentiometer 1

is determined by the byte at EEPROM memory location F8h.

NC C3 No Connect.

NC D2 No Connect.

DS1845

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DS1845 BLOCK DIAGRAM Figure 1

MEMORY ORGANIZATION

The DS1845’s serial EEPROM is internally organized with 256 words of 1 byte each. Each word requires

an 8-bit address for random word addressing. The byte at address F9h determines the wiper setting for

potentiometer 0, which contains 100 positions. Writing values above 63h to this address sets the wiper to

its uppermost position. The byte at address F8h determines the wiper setting for potentiometer 1, which

contains 256 positions (00h to FFh). The factory default wiper position for both potentiometers is FFh.

Memory locations 00h to F7h are factory programmed to 00h. Address locations FAh though FFh are

reserved and should not be written.

DEVICE OPERATION

Clock and Data Transitions: The SDA pin is normally pulled high with an external resistor or device.

Data on the SDA pin may only change during SCL low time periods. Data changes during SCL high

periods will indicate a start or stop conditions depending on the conditions discussed below. Refer to the

timing diagram Fig 2 for further details.

Start Condition: A high-to-low transition of SDA with SCL high is a start condition which must

precede any other command. Refer to the timing diagram Fig 2 for further details.

Stop Condition: A low-to-high transition of SDA with SCL high is a stop condition. After a read

sequence, the stop command places the DS1845 into a low-power mode. Refer to the timing diagram Fig

2 for further details.

Acknowledge: All address and data byte are transmitted via a serial protocol. The DS1845 pulls the

SDA line low during the ninth clock pulse to acknowledge that it has received each word.

Standby Mode: The DS1845 features a low-power mode that is automatically enabled after power-on,

after a stop command, and after the completion of all internal operations.

VCC

GND

SDA

SCL

248 BYTES

EEPROM

MEMORY

6 RESERVED

BYTES

1 BYTE WIPER

SETTING

POT 0

1 BYTE WIPER

SETTING

POT 1

CONTROL

DATA

POTENTIOMETER 0

2-WIRE

INTERFACE

POTENTIOMETER 1

100

Position

Pot

256

Position

Pot

DS1845

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2-Wire Interface Reset: After any interruption in protocol, power loss, or system reset, the following

steps reset the DS1845.

1. Clock up to nine cycles.

2. Look for SDA high in each cycle while SCL is high.

3. Create a start condition while SDA is high.

Device Addressing: The DS1845 must receive an 8-bit device address word following a start condition

to enable a specific device for a read or write operation. The address word is clocked into the DS1845

MSB to LSB. The address word consists of Ah (1010) followed by A2, A1, and A0 then the R/W

(READ/WRITE) bit. If the R/W bit is high, a read operation is initiated. The R/W is low, a write

operation is initiated. For a device to become active, the values of A2, A1 and A0 must be the same as

the hard-wired address pins on the DS1845. Upon a match of written and hard-wired addresses, the

DS1845 will output a zero for one clock cycle as an acknowledge. If the address does not match the

DS1845 returns to a low-power mode.

Write Operations: After receiving a matching address byte with the R/W bit set low, the device goes

into the write mode of operation. The master must transmit an 8-bit EEPROM memory address to the

device to define the address where the data is to be written. After the reception of this byte, the DS1845

will transmit a zero for one clock cycle to acknowledge the receipt of the address. The master must then

transmit an 8-bit data word to be written into this address. The DS1845 will again transmit a zero for one

clock cycle to acknowledge the receipt of the data. At this point the master must terminate the write

operation with a stop condition. The DS1845 then enters an internally timed write process tw to the

EEPROM memory. All inputs are disabled during this byte write cycle.

The DS1845 is capable of an 8-byte page write. A page write is initiated the same way as a byte write,

but the master does not send a stop condition after the 1st byte. Instead, after the slave acknowledges

receipt of the data byte, the master can send up to seven more bytes using the same nine-clock sequence.

The master must terminate the write cycle with a stop condition or the data clocked into the DS1845 will

not be latched into permanent memory.

Acknowledge Polling: Once the internally-timed write has started and the DS1845 inputs are disabled,

acknowledge polling can be initiated. The process involves transmitting a start condition followed by the

device address. The R/W bit signifies the type of operation that is desired. The read or write sequence

will only be allowed to proceed if the internal write cycle has completed and the DS1845 responds with a

zero.

Read Operations: After receiving a matching address byte with the R/W bit set high, the device goes

into the read mode of operation. There are three read operations: current address read, random read and

sequential address read.

DS1845

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CURRENT ADDRESS READ

The DS1845 has an internal address register that maintains the address used during the last read or write

operation, incremented by one. This data is maintained as long as VCC is valid. If the most recent

address was the last byte in memory, then the register resets to the first address. This address stays valid

between operations as long as power is available.

Once the device address is clocked in and acknowledged by the DS1845 with the R/W bit set to high, the

current address data word is clocked out. The master does not respond with a zero, but does generate a

stop condition afterwards.

RANDOM READ

A random read requires a dummy byte write sequence to load in the data word address. Once the device

and data address bytes are clocked in by the master, and acknowledged by the DS1845, the master must

generate another start condition. The master now initiates a current address read by sending the device

address with the read/write bit set high. The DS1845 will acknowledge the device address and serially

clocks out the data byte.

SEQUENTIAL ADDRESS READ

Sequential reads are initiated by either a current address read or a random address read. After the master

receives the first data byte, the master responds with an acknowledge. As long as the DS1845 receives

this acknowledge after a byte is read, the master may clock out additional data words from the DS1845.

After reaching address FFh, it resets to address 00h.

The sequential read operation is terminated when the master initiates a stop condition. The master does

not respond with a zero.

For a more detailed description of 2-wire theory of operation, refer to the following section.

2-WIRE SERIAL PORT OPERATION

The 2-wire serial port interface supports a bi-directional data transmission protocol with device

addressing. A device that sends data on the bus is defined as a transmitter, and a device receiving data as

a receiver. The device that controls the message is called a “master.” The devices that are controlled by

the master are “slaves.” The bus must be controlled by a master device that generates the serial clock

(SCL), controls the bus access, and generates the START and STOP conditions. The DS1845 operates as

a slave on the two-wire bus. Connections to the bus are made via the open-drain I/O lines SDA and SCL.

The following I/O terminals control the 2-wire serial port: SDA, SCL, A0, A1, A2. Timing diagrams for

the 2-wire serial port can be found in Figures 2 and 3. Timing information for the 2-wire serial port is

provided in the AC Electrical Characteristics table for 2-wire serial communications.

The following bus protocol has been defined:

- Data transfer may be initiated only when the bus is not busy.

- During data transfer, the data line must remain stable whenever the clock line is HIGH. Changes in

the data line while the clock line is HIGH will be interpreted as control signals.

Accordingly, the following bus conditions have been defined:

Bus not busy: Both data and clock lines remain HIGH.

DS1845

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Start data transfer: A change in the state of the data line from HIGH to LOW while the clock is HIGH

defines a START condition.

Stop data transfer: A change in the state of the data line from LOW to HIGH while the clock line is

HIGH defines the STOP condition.

Data valid: The state of the data line represents valid data when, after a START condition, the data line

is stable for the duration of the HIGH period of the clock signal. The data on the line can be changed

during the LOW period of the clock signal. There is one clock pulse per bit of data. Figures 2 and 3

detail how data transfer is accomplished on the two-wire bus. Depending upon the state of the R/W bit,

two types of data transfer are possible.

Each data transfer is initiated with a START condition and terminated with a STOP condition. The

number of data bytes transferred between START and STOP conditions is not limited and is determined

by the master device. The information is transferred byte-wise and each receiver acknowledges with a 9th

bit.

Within the bus specifications a regular mode (100 kHz clock rate) and a fast mode (400 kHz clock rate)

are defined. The DS1845 works in both modes.

Acknowledge: Each receiving device, when addressed, is obliged to generate an acknowledge after the

reception of each byte. The master device must generate an extra clock pulse which is associated with this

acknowledge bit.

A device that acknowledges must pull down the SDA line during the acknowledge clock pulse in such a

way that the SDA line is a stable LOW during the HIGH period of the acknowledge related clock pulse.

Of course, setup and hold times must be taken into account. A master must signal an end of data to the

slave by not generating an acknowledge bit on the last byte that has been clocked out of the slave. In this

case, the slave must leave the data line HIGH to enable the master to generate the STOP condition.

1. Data transfer from a master transmitter to a slave receiver. The 1st byte transmitted by the master is

the command/control byte. Next follows a number of data bytes. The slave returns an acknowledge bit

after each received byte.

2. Data transfer from a slave transmitter to a master receiver. The master transmits the 1st byte (the

command/control byte) to the slave. The slave then returns an acknowledge bit. Next follows a

number of data bytes transmitted by the slave to the master. The master returns an acknowledge bit

after all received bytes other than the last byte. At the end of the last received byte, a ‘not

acknowledge’ can be returned.

The master device generates all serial clock pulses and the START and STOP conditions. A transfer is

ended with a STOP condition or with a repeated START condition. Since a repeated START condition is

also the beginning of the next serial transfer, the bus will not be released.

DS1845

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The DS1845 may operate in the following two modes:

1. Slave receiver mode: Serial data and clock are received through SDA and SCL respectively. After

each byte is received, an acknowledge bit is transmitted. START and STOP conditions are

recognized as the beginning and end of a serial transfer. Address recognition is performed by

hardware after reception of the slave (device) address and direction bit.

2. Slave transmitter mode: The 1st byte is received and handled as in the slave receiver mode. However,

in this mode the direction bit will indicate that the transfer direction is reversed. Serial data is

transmitted on SDA by the DS1845 while the serial clock is input on SCL. START and STOP

conditions are recognized as the beginning and end of a serial transfer.

Slave Address: command/control byte is the 1st byte received following the START condition from the

master device. The command/control byte consists of a 4-bit control code. For the DS1845, this is set as

1010 binary for read/write operations. The next 3 bits of the command/ control byte are the device select

bits or slave address (A2, A1, A0). They are used by the master device to select which of eight devices is

to be accessed. When reading or writing the DS1845, the device-select bits must match the device-select

pins (A2, A1, A0). The last bit of the command/control byte (R/W) defines the operation to be performed.

When set to a 1 a read operation is selected, and when set to a 0 a write operation is selected.

Following the START condition, the DS1845 monitors the SDA bus checking the device type identifier

being transmitted. Upon receiving the 1010 control code, the appropriate device address bits, and the

read/write bit, the slave device outputs an acknowledge signal on the SDA line.

WRITE PROTECT

An external pin WP (write protect) protects EEPROM data and potentiometer position from alteration in

an application. This pin must be open or tied high to protect data from alteration.

READING AND WRITING THE POTENTIOMETER VALUES

Reading from and writing to the potentiometers consists of a standard read or write to EEPROM memory

at the addresses F8h and F9h. The 8-bit value at address F9h controls the wiper setting for potentiometer

0, which has 100 positions. The 8-bit value at address F8h controls the wiper setting of potentiometer 1,

which has 256 positions. Potentiometer 1 may be set to any value between 00h and FFh. 00h sets the

wiper of potentiometer 1 to its lowest value and FFh sets the wiper to its highest. Potentiometer 0 may be

set to any value between 00h and 63h. A value of 00h sets the wiper of potentiometer 0 to its lowest

position and 63h sets the wiper to its highest position. Any hexadecimal value is a valid address. Setting

a value greater than the upper limit of the potentiometer’s range, 64h or greater for potentiometer 0, will

result in setting the wiper to its highest position, but the MSB will be ignored.

DS1845

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2- WIRE PROTOCOL DATA TRANSFER PROTOCOL Figure 2

2-WIRE AC CHARACTERISTICS Figure 3

DS1845

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ABSOLUTE MAXIMUM RATINGS*

Voltage on Any Pin Relative to Ground -0.5V to +6.0V

Operating Temperature -40°C to +85°C; Industrial

Programming Temperature 0°C to +70°C

Storage Temperature -55°C to +125°C

Soldering Temperature See J-STD-020 specification

* This is a stress rating only and functional operation of the device at these or any other conditions above

those indicated in the operation sections of this specification is not implied. Exposure to absolute

maximum rating conditions for extended periods of time may affect reliability.

RECOMMENDED OPERATING CONDITIONS (-40°C to +85°C)

PARAMETER SYMBOL MIN TYP MAX UNITS NOTES

Supply Voltage VCC +2.7 5.5 V 1

Input Logic 1 VIH .7 VCC V

CC+0.5 V 1,3

Input Logic 0 VIL -0.5 .3 VCC V 1,3

Resistor Inputs L,H,W -0.5 VCC+0.5 V 1

DS1845

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DC ELECTRICAL CHARACTERISTICS (-40°C to +85°C; VCC =2.7V to 5.5V)

PARAMETER SYMBOL CONDITION MIN TYP MAX UNITS NOTES

Supply Current

Active

ICC 0.5 mA 12,13

Input Leakage ILI -1 +1 mA

Wiper Resistance

500

250

1000

600

Wiper Current IW 2 mA

Input Logic levels

A0, A1, A2

Input Logic 1

Input Logic 0

0.7 VCC

-0.5

CC+0.5

0.3 VCC

Input Current each

I/O pin

0.4<VI/O

<0.9VDD -10 +10 mA

Standby Current

ISTBY

VOL1 3 mA sink

current

0.0 0.4 V Low Level Output

Voltage (SDA)

VOL2 6 mA sink

current

0.0 0.6 V

I/O Capacitance CI/O 10 pF

WP Internal Pull Up

Resistance, Rwp

Rwp 40 65 100 kW

DS1845

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ANALOG RESISTOR CHARACTERISTICS (-40°C to +85°C; VCC=2.7V to 5.5V)

PARAMETER SYMBOL CONDITION MIN TYP MAX UNITS NOTES

End-to-End Resistance 25°C -20 +20 %

Absolute Linearity 10kW/100 pos.

10kW/256 pos.

20kW/256 pos.

50kW/256 pos.

100kW/256

pos.

-0.75

-1.0

-1.5

-2.25

+0.75

+1.0

+1.5

+2.25

LSB 9

Relative Linearity 10kW/100 pos.

all other pots

-0.25

-0.5

+0.25

+0.5

LSB 10

-3dB Cutoff freq. fCUTOFF DS1845-010 1 MHz

End-to-End Temp.

Coefficient

750

ppm/°C 11

DS1845

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AC ELECTRICAL CHARACTERISTICS (-40°C to 85°C , Vcc=2.7V to 5.5V)

PARAMETER SYMBOL CONDITION MIN TYP MAX UNITS NOTES

SCL clock frequency fSCL Fast Mode

Standard Mode

400

100

kHz 4

Bus free time between

STOP and START

condition

tBUF

Fast Mode

Standard Mode

1.3

4.7

Hold time (repeated)

START condition tHD:STA Fast Mode

Standard Mode

0.6

4.0

ms 5

Low period of SCL clock tLOW Fast Mode

Standard Mode

1.3

4.7

High period of SCL clock tHIGH Fast Mode

Standard Mode

0.6

4.0

Data hold time tHD:DAT Fast Mode

Standard Mode

0.9

ms 6

Data set-up time tSU:DAT Fast Mode

Standard Mode

100

250

Start set-up time tSU:STA Fast Mode

Standard Mode

0.6

4.7

Rise time of both SDA

and SCL signals tR Fast Mode

Standard Mode

20 +

0.1CB

300

1000

ns 7

Fall time of both SDA

and SCL signals tF Fast Mode

Standard Mode

20 +

0.1CB

300

ns 7

Set-up time for STOP

condition tSU:STO Fast Mode

Standard Mode

0.6

4.0

Capacitive load for each

bus line CB

400 pF 7

EEPROM write time tW 5 ms 8

NOTES:

1. All voltages are referenced to ground.

2. ISTBY specified with VCC equal 3.0V and 5.0V and control port logic pins are driven to the appropriate

logic levels. Appropriate logic levels specify that logic inputs are within a 0.5V of ground or VCC for

the corresponding inactive state.

3. I/O pins of fast mode devices must not obstruct the SDA and SCL lines if VCC is switched off.

4. A fast mode device can be used in a standard mode system, but the requirement tSU:DAT > 250 ns must

then be met. This will automatically be the case if the device does not stretch the LOW period of the

SCL signal. If such a device does stretch the LOW period of the SCL signal, it must output the next

data bit to the SDA line tRMAX + tSU:DAT = 1000 + 250 = 1250 ns before the SCL line is released.

5. After this period, the first clock pulse is generated.

6. The maximum tHD:DAT has only to be met if the device does not stretch the LOW period (tLOW) of the

SCL signal.

DS1845

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7. CB - total capacitance of one bus line in picofarads. Timing referenced to 0.9VCC and 0.1VCC.

8. EEPROM write begins after a stop condition occurs.

9. Absolute linearity is used to measure expected wiper voltage as determined by wiper position.

10. Relative linearity is used to determine the change of wiper voltage between two adjacent wiper

positions.

11. When used as a rheostat or variable resister the temperature coefficient applies: 750 ppm/°C. When

used as a voltage divider or potentiometer, the effective temperature coefficient approaches

30 ppm/°C.

12. ICC specified with SDA pin open.

13. Maximum Icc is dependent on clock rates.

DS1845

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ORDERING INFORMATION

ORDERING

NUMBER

PACKAGE ORERATING

TEMPERATURE

VERSION

Pot 0/Pot 1

DS1845E-010 14 PIN TSSOP (173 MIL) -40ºC TO +85ºC 10 kW/10 kW

DS1845E-010/T&R 14 PIN TSSOP/TAPE & REEL -40ºC TO +85ºC 10 kW/10 kW

DS1845X-010/T&R 14 PIN FLIP CHIP -40ºC TO +85ºC 10 kW/10 kW

DS1845B-010 16 BALL CSBGA (4X4 MM) -40ºC TO +85ºC 10 kW/10 kW

DS1845E-050 14 PIN TSSOP (173 MIL) -40ºC TO +85ºC 10 kW/50 kW

DS1845E-050/T&R 14 PIN TSSOP/TAPE & REEL -40ºC TO +85ºC 10 kW/50 kW

DS1845X-050/T&R 14 PIN FLIP CHIP -40ºC TO +85ºC 10 kW/50 kW

DS1845B-050 16 BALL CSBGA (4X4 MM) -40ºC TO +85ºC 10 kW/50 kW

DS1845E-100 14 PIN TSSOP (173 MIL) -40ºC TO +85ºC 10 kW/100 kW

DS1845E-100/T&R 14 PIN TSSOP/TAPE & REEL -40ºC TO +85ºC 10 kW/100 kW

DS1845X-100/T&R 14 PIN FLIP CHIP -40ºC TO +85ºC 10 kW/100 kW

DS1845B-100 16 BALL CSBGA (4X4 MM) -40ºC TO +85ºC 10 kW/100 kW

DS1845E-100+ 14 PIN TSSOP LF (173 MIL) -40ºC TO +85ºC 10 kW/100 kW

DS1845B-010+T&R 16 BALL CSBGA/T&R LF (4X4

MM)

-40ºC TO +85ºC 10 kW/10 kW

DS1845B-010/T&R 16 BALL CSBGA/T&R -40ºC TO +85ºC 10 kW/10 kW

DS1845B-100+ 16 BALL CSBGA LF (4X4 MM) -40ºC TO +85ºC 10 kW/100 kW

DS1845E-100+T&R 14 PIN TSSOP/T&R LF (173

MIL)

-40ºC TO +85ºC 10 kW/100 kW

DS1845B-010+ 16 BALL CSBGA LF (4X4 MM) -40ºC TO +85ºC 10 kW/10 kW

DS1845E-010+ 14 PIN TSSOP LF (173 MIL) -40ºC TO +85ºC 10 kW/10 kW

DS1845E-010+T&R 14 PIN TSSOP/T&R LF -40ºC TO +85ºC 10 kW/10 kW

DS1845E-050+T&R 14 PIN TSSOP/T&R LF (173

MIL)

-40ºC TO +85ºC 10 kW/50 kW

DS1845B-050+ 16 BALL CSBGA LF (4X4 MM) -40ºC TO +85ºC 10 kW/50 kW

DS1845E-050+ 14 PIN TSSOP LF -40ºC TO +85ºC 10 kW/50 kW

DS1845B-020 16 BALL CSBGA (4X4 MM) -40ºC TO +85ºC 10 kW/20 kW

DS1845B-050/T&R 16 BALL CSBGA/T&R -40ºC TO +85ºC 10 kW/50 kW

DS1845B-050+T&R 16 BALL CSBGA/T&R LF (4X4

MM)

-40ºC TO +85ºC 10 kW/50 kW

DS1845E-020 14 PIN TSSOP -40ºC TO +85ºC 10 kW/20 kW

*LF = lead free