LM8500IMT9B/NOPB - NATIONAL SEMICONDUCTOR

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LM8300/LM8500 Four Wire Resistive Touchscreen Controller with Brownout

Check for Samples: LM8300,LM8500

1FEATURES DESCRIPTION

The LM8300/8500 is a 4-wire resistive touch screen

2• Supports 4 Wire Resistive Touch Panels controller. The controller samples and drives the

• Low Power Standby Current Typically Less touch screen without the need of any external

Than 2 µA at 5.5V hardware. The built in 10-bit A/D provides a

• Maximum Speed of 500 Coordinate Pairs per maximum of 500 coordinate pairs per second (cpps).

The data sampled from the touch screen is sent out

Second on the UART at a speed of 38400 bps.

• Automatic Wake Up and Return to Standby The controller has a power-saving mode which

• 10 bit A/D causes the controller to self-power down when no

• On-chip Touch Screen Current Drivers - No touch is detected on the touch screen for a specified

External Driver Required amount of time. In the self-power down mode, the

• UART Interface current drawn is typically less than 2 µA. The device

resumes normal operation when a touch is detected

• Controller Configurations are Stored in the on the touch screen or communication is detected on

Internal Non-volatile Storage Element the UART. In addition to the self-power down mode,

• Touch Pressure can be Measured the controller can be disabled by pulling the

SHUTDOWN pin low. The controller resumes normal

APPLICATIONS operation when the SHUTDOWN pin is tristated or

pulled high.

• Personal Digital Assistants

• Smart Hand-Held Devices The controller has an internal non-volatile memory

storage element to store configuration data such as

• Touch Screen Monitors calibration points or controller configurations.

• Point-of-Sales Terminals

• KIOSK

• Pagers

• Cell Phones

Table 1. Devices included in this datasheet

Operating Brownout Operating I/O

Device Packages Temperature

Voltage Voltage Frequency Pins

44 WQFN, 44 PLCC,

LM8300 3, 5 V 2.7 to 2.9 V 3.27 MHz 18 0°C to +70°C

48 TSSOP

44 WQFN, 44 PLCC,

LM8500 5 V 4.17V to 4.5V 3.27, 10 MHz 18 0°C to +70°C

48 TSSOP

1Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2All trademarks are the property of their respective owners.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

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Block Diagram

* This pin is available in the LM8500. It is unused in the LM8300.

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Connection Diagram

* This pin is available in the LM8500. It is * This pin is available in the LM8500. It is

unused in the LM8300. unused in the LM8300.

Figure 1. Top View Figure 3. Top View

PLCC Package TSSOP Package

See Package Number FN0044A See Package Number DGG

* This pin is available in the LM8500. It is

unused in the LM8300.

Figure 2. Top View

WQFN Package

See Package Number NJN0044A

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PIN DESCRIPTIONS Pinouts for 44- and 48-Pin Packages

Pin Name Direction Pin Description 44-Pin WQFN 44-Pin PLCC 48-Pin TSSOP

RESET I Reset pin, pull low to reset 6 1 1

DTR I UART data terminal ready signal 7 2 2

WD_OUT Watchdog output, tie to RESET pin for 8 3 3

Ocorrect function

CLK_SET(1) Used to set if crystal is 3.3 MHz (low) or 9 4 4

I10 MHz (floating or pulled high)

Unused(2) 10 5 5

Unused(2) 11 6 6

Unused(2) 12 7 7

Unused(2) 13 8 8

OSC_OUT O Clock oscillator output 14 9 9

OSC_IN I Clock oscillator input 15 10 10

Unused(2) 16 11 11

Unused(2) 17 12 12

UART_TX O UART transmit pin (inverted for use with 18 13 13

standard RS-232 drivers)

UART_RX I UART receive pin (inverted for use with 19 14 14

standard RS-232 drivers

SHUTDOWN I Shutdown pin, puts the device in halt 20 15 15

mode if pulled low

Unused(2) 21 16 16

Unused(2) 22 17 17

WAKE-UP I Used to wake up the processor from halt 23 18 18

mode with touch on touch screen

X+ I/O Drives the X+ wire, also analog input 24 19 19

when sampling

Y- I/O Drives the Y- wire, also analog input 25 20 20

when sampling

X- I/O Drives the X- wire, also analog input 26 21 21

when sampling

Y+ I/O Drives the Y+ wire, also analog input 27 22 22

when sampling

Unused(2) 28 23 23

Unused(2) 29 24 24

FILTER_OUT O Analog output to the filter 30 25 25

FILTER_IN I Analog input from the filter 31 26 26

GND Digital ground 32 27 27

AGND Analog ground 33 28 28

AVCC Analog power supply, connect to filter 34 29 31

for best performance

VCC Digital power supply 35 30 32

Unused(2) X X 33

Unused(2) X X 34

Unused(2) 36 31 35

Unused(2) 37 32 36

Unused(2) 38 33 37

Unused(2) 39 34 38

Unused(2) 40 35 39

Unused(2) 41 36 40

(1) This is available in the LM8500 only.

(2) These pins are for future functional expansions.

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PIN DESCRIPTIONS Pinouts for 44- and 48-Pin Packages (continued)

Pin Name Direction Pin Description 44-Pin WQFN 44-Pin PLCC 48-Pin TSSOP

LED Output Optional LED output, low when running, 42 37 41

high in halt-mode

Unused(3) 3 42 46

Unused(3) 4 43 47

Unused(3) 5 44 48

(3) These pins are for future functional expansions.

These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam

during storage or handling to prevent electrostatic damage to the MOS gates.

Absolute Maximum Ratings(1)(2)

Supply Voltage (VCC) 7V

Voltage at Any Pin −0.3V to VCC +0.3V

Total Current into VCC Pin (Source) 200 mA

Total Current out of GND Pin (Sink) 200 mA

Storage Temperature Range −65°C to +140°C

ESD Protection Level 2 kV (Human Body Model)

(1) Absolute maximum ratings indicate limits beyond which damage to the device may occur. DC and AC electrical specifications are not

ensured when operating the device at absolute maximum ratings.

(2) If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office/Distributors for availability and

specifications.

Electrical Characteristics

DC Electrical Characteristics (0°C ≤TA≤+70°C)

Datasheet min/max specification limits are guaranteed by design, test, or statistical analysis.

Parameter Conditions Min Typ Max Units

Operating Voltage 2.7 5.5 V

Power Supply Rise Time 10 50 x 106ns

Power Supply Ripple(1) Peak-to-Peak 0.1 VCC V

Supply Current(2)

High Speed Mode

CKI = 10 MHz VCC = 5.5V 11.5 mA

CKI = 3.33 MHz VCC = 4.5V 5 mA

HALT Current with BOR Disabled(3)

High Speed Mode VCC = 5.5V, CKI = 0 MHz <2 10 µA

Supply Current for BOR Feature VCC = 5.5V 45 μA

High Brownout Trip Level (BOR Enabled) 4.17 4.28 4.5 V

Low Brownout Trip Level (BOR Enabled) 2.7 2.78 2.9 V

Input Levels (VIH, VIL)

Logic High 0.8 VCC V

Logic Low 0.16 VCC V

Internal Bias Resistor for the CKI Crystal/Resonator 0.3 1.0 2.5 MΩ

Oscillator

Hi-Z Input Leakage VCC = 5.5V −0.5 +0.5 μA

Input Pullup Current VCC = 5.5V, VIN = 0V −50 −210 μA

Port Input Hysteresis 0.25 VCC V

(1) Maximum rate of voltage change must be < 0.5 V/ms.

(2) Supply and IDLE currents are measured with CKI driven with a square wave Oscillator, CKO driven 180° out of phase with CKI, inputs

connected to VCC and outputs driven low but not connected to a load.

(3) The HALT mode will stop CKI from oscillating. Measurement of IDD HALT is done with device neither sourcing nor sinking current; all

inputs tied to VCC; A/D converter and clock monitor and BOR disabled.

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Electrical Characteristics

DC Electrical Characteristics (0°C ≤TA≤+70°C) (continued)

Datasheet min/max specification limits are guaranteed by design, test, or statistical analysis.

Parameter Conditions Min Typ Max Units

Source(4) VCC = 4.5V, VOH = 4.2V −10 mA

Output

Current VCC = 2.7V, VOH = 2.4V −6 mA

Levels Sink(4) VCC = 4.5V, VOL = 0.3V 10 mA

Outputs VCC = 2.7V, VOL = 0.3V 6 mA

X+, X-, Y+,

Y- Allowable Sink and Source Current per Pin 20 mA

Source (Weak Pull-Up Mode) VCC = 4.5V, VOH = 3.8V −10 µA

VCC = 2.7V, VOH = 1.8V −5 µA

Source (Push-Pull Mode) VCC = 4.5V, VOH = 3.8V −7 mA

All Others VCC = 2.7V, VOH = 1.8V −4 mA

Sink (Push-Pull Mode)(4) VCC = 4.5V, VOL = 1.0V 10 mA

VCC = 2.7V, VOL = 0.4V 3.5 mA

Allowable Sink and Source Current per Pin 15 mA

TRI-STATE Leakage VCC = 5.5V −0.5 +0.5 μA

Maximum Input Current without Latchup ±200 mA

RAM Retention Voltage, VR(in HALT Mode) 2.0 V

Input Capacitance 7 pF

(4) Absolute Maximum Ratings should not be exceeded.

A/D Converter Electrical Characteristics (0°C ≤TA≤+70°C) (Single-ended mode only)

Datasheet min/max specification limits are guaranteed by design, test, or statistical analysis.

Parameter Conditions Min Typ Max Units

Resolution 10 Bits

DNL VCC = 5V ±1 LSB

DNL VCC = 3V ±1 LSB

INL VCC = 5V ±2 LSB

INL VCC = 3V ±4 LSB

Offset Error VCC = 5V ±1.5 LSB

Offset Error VCC = 3V ±2.5 LSB

Gain Error VCC = 5V ±1.5 LSB

Gain Error VCC = 3V ±2.5 LSB

Input Voltage Range 2.7V ≤VCC < 5.5V 0 VCC V

Analog Input Leakage Current 0.5 µA

Analog Input Resistance(1) 6k Ω

Analog Input Capacitance 7 pF

Operating Current on AVCC AVCC = 5.5V 0.2 0.6 mA

(1) Resistance between the device input and the internal sample and hold capacitance.

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FUNCTIONAL DESCRIPTION

GENERAL

The LM8300/8500 is a 4-wire resistive touch screen controller. The primary communication is through the built in

UART operating at a baud rate of 38400. The LM8300/8500 has the ability to measure pressure on the Z-axis, in

addition to the X-Y coordinates.

The device has the capability to do a 2, 5, and 13 point calibration. All calibration data is stored in the internal

non-volatile storage element. In addition, all settings pertaining to the controller are stored internally. This feature

negates the need for external EEPROM.

The device has three built in averaging algorithms: oversampling, delta, and focus. These algorithms help to

minimize noise and A/D variation due to noise. Refer to the Averaging Algorithm section for a more detail

explanation. These algorithms are implemented on-chip, freeing the main processor from these tasks. To further

minimize noise in extremely noisy environments, the device has the ability to route the signal from the touch

panel to an external filtering stage before A/D conversions are performed.

To minimize power consumption, the device can be put into power save mode. The device can be set to go into

power save mode automatically or manually by pulling the external shutdown pin low.

ADVANCED PIN DESCRIPTIONS

CLK_SET — This pin is the selection pin used to determine the operating frequency of the controller. On power

up, the controller polls this pin to determine if the operating frequency is set to 10 MHz or 3.3 MHz. If the pin is

left floating or tied high, then the operating frequency is 10 MHz. If the pin is tied low, then the operating

frequency is set to 3.3 MHz.

NOTE

This is available on the LM8500 only.

SHUTDOWN — This is the external shut down pin. When pulled low, the controller goes into power saving

mode. This selection pin state has higher priority than the internal power save mode settings.

WAKE_UP — This pin is used to wake the controller from power save mode. When the device is in power save

mode, the pin must be tied to one of X-Y lines coming from the touch screen panel.

X+ — Connect to X+ terminal of the resistive screen.

X– — Connect to X– terminal of the resistive screen.

Y+ — Connect to Y+ terminal of the resistive screen.

Y– — Connect to Y– terminal of the resistive screen.

Filter_out — Analog output to external filter. The use of the external filter is controlled by sending a command

byte of $A0 on the UART to the controller.

Filter_in — Analog input from external filter. The use of the external filter is controlled by sending a command

byte of $A0 on the UART to the controller.

LED — Optional LED output. When the controller is operating in normal (non power save) mode, a low is output

to the pin. When the controller is in power save mode, a high is output to the pin.

RESET — Reset pin. When pulled low, a manual reset is executed. For normal operation, this pin must be pulled

high. Under no circumstances should the pin be left floating.

UART_TX — UART transmit pin. The signal is inverted for use with standard RS-232 drivers.

UART_RX — UART receive pin. The signal is inverted for use with standard RS-232 drivers.

DTR — Data Terminal Ready signal for the UART. If a high level is detected on the pin, this signals that the

UART is not ready. If a low level is detected on the pin, this signals that the UART is ready.

WD_Out — Watch dog output. For correct operation, this pin should be connected to the RESET pin.

OSC_OUT — Clock oscillator output pin.

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OSC_IN — Clock oscillator input pin

GND — Digital Ground

AGND — Analog ground

DVCC — Digital power supply.

AVCC — Analog power supply. For best performance, this pin should be connected to a filter.

Users of the WQFN package are cautioned to be aware that the central metal area and the pin 1 index mark on

the bottom of the package may be connected to GND. See Figure 4 below:

Figure 4. WQFN Package Bottom View

USART FRAMING FORMAT

The device communicates with the touch screen driver using the UART set at a baud rate of 38400, 8, n, 1.

All communication from the host software and the controller consists of a command byte and occasionally data

byte(s). If data byte(s) follow a command byte, it must be sent directly after the command byte. If the device is in

the power save mode, a delay must be inserted between the wake up command and the command byte. Refer to

the Power Save Mode (Low Power Stand-by) section for more details. For every command byte sent to the

controller, an acknowledge byte is sent back and sometimes data byte(s).

A command byte is distinguished by having the 7th bit of the command byte set (1). If any data byte(s) is to

follow, the 7th bit of the data byte is reset (0).

Data packets sent to the host software can be either four or five bytes in length. If the pressure measurement is

enabled, five bytes are sent. If the pressure measurement is not enabled, four bytes are sent.

The first byte of each data packet is a header byte. This header byte is used to synchronize and differentiate

between four or five byte packages. If a four byte data package is sent, the 4th bit of the header byte is reset (0).

If a five byte data package is sent, the 4th bit of the header byte is set (1).

The 6th bit of the second byte of the data packet is used to indicate the touch state. If the bit is set (1), then a

touchdown or continuous touch is detected. If the bit is reset (0), then a liftoff is detected.

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Data packet format table

Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

Byte1100L0000

Byte 2 0 S X2X1X0Y2Y1Y0

Byte 3 0 X9X8X7X6X5X4X3

Byte 4 0 Y9Y8Y7Y6Y5Y4Y3

Byte 5 0 Z6Z5Z4Z3Z2Z1Z0

L – Package length. (0 = 4 bytes, 1 = 5 bytes)

S – Touch state (0 = liftoff, 1 = touchdown or continuous touch)

XX– X position (10 bit value)

YY– Y position (10 bit value)

ZZ– Z positon (7 bit value), this byte is only transmitted if the pressure measurement is enabled

Command Bytes

PC TSC

PC Command PC Byte 1 TSC Byte 1

Byte 2 Byte 2

Read clock-speed (3,33MHz, $B0 $CA $00, $01

10MHz)

Read parameters $B1 $CA See Advanced Command Bytes

Descriptions

Read software version number $B2 $C7 See Advanced Command Bytes

Descriptions

Read # of calibration points $B3 $CA $00, $02, $05, $0D

Read stored calibration points $B4 $CA See Advanced Command Bytes

Descriptions

Set focus value (# of pixels on touch $B8 $0-$3F $CA $00-$3F

panel)

Set # of samples per coordinate (1, $BA $01, $02, $04, $08, $10, $20 $CA $01, $02, $04, $08, $10, $20

2, 4, 8, 16, 32)

Set communication mode (stream, $BB $01, $02, $04 $CA $01, $02, $04

touchdown, liftoff)

Set max delta (# of pixels from $BC $00-$3F $CA $00-$3F

predicted coordinate)

Set calibration points $BD See Advanced Command $CA See Advanced Command Bytes

Bytes Descriptions Descriptions

Set minimum pressure $BE $00-$7F $CA $00-$7F

Toggle disable/enable external filter $A0 $CA $00, $01

path

Toggle disable/enable self power- $A2 $CA $00, $01

down

Toggle disable/enable echo mode $A3 $CA $00, $01

Toggle disable/enable pressure $A4 $CA $00, $01

measurements

Toggle disable/enable calibration $A5 $CA $00, $01

coordinate check

Wakeup $A7

Shutdown $A8 $CA

Soft reset $AF $CA $CB, $CC

TSC Replies

Timeout $CF

Re-send $CE

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PC TSC

PC Command PC Byte 1 TSC Byte 1

Byte 2 Byte 2

Self test failed $CC

Self test ok $CB

Acknowledge $CA

Calibration coordinates ok $C4

Error / buffer overrun $C8

Software version $C7 $0-$7F

Data transmit $80/$90 Payload (3/4 bytes)

Advanced Command Bytes Descriptions

Unless otherwise mentioned, all values are in hex.

$B0: Read clock-speed

Reply Byte #1: $CA (Acknowledge)

Byte #2: Clock readout (0 = 3.3MHz, 1 = 10MHz)

CLK_SEL pin tells the firmware which oscillator speed is used. If the CLK_SEL input pin is floating or pulled high

a 10.0MHz oscillator must be connected. If the pin is pulled low a 3.3MHz oscillator must be connected. This

command enables the driver software to determine which oscillator speed is used with the touch screen

controller, as this determines the maximum coordinate pair per second data rates.

NOTE

This is available in the LM8500 only.

$B1: Read parameters

Reply Byte #1: $CA (Acknowledge)

Reply Byte #2: First byte in software version number, year 20 (00-99)

Reply Byte #3: Communication mode (1 = stream, 2 = touchdown, 4 = liftoff)

Byte #4: Wakeup on touch (0 = disabled, 1 = enabled)

Reply Byte #5: Number of samples (1,2, 4, 8, 16 or 32)

Byte #6: Clock readout (0 = 3.3MHz, 1 = 10MHz)

Byte #7: Second byte in software version number, month (1-12)

Byte #8: Third byte in software version number, day (1-31)

Byte #9: Focus value (0-63)

Byte #10: Max delta (0-63)

Byte #11: Number of calibration coordinates (0, 2, 5 or 13)

Byte #12: Toggle-flags:

Bit #5: calibration coordinates check (0=disabled, 1=enabled)

Bit #4: Pressure measurement (0=disabled, 1=enabled)

Bit #3: Echo mode (0=disabled, 1=enabled)

Bit #2: Self Power-Down mode (0=disabled, 1=enabled)

Bit #1: Unused

Bit #0: External filter path (0=disabled, 1=enabled)

Byte #13: Pressure threshold for valid touch

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This command allows the user to read all the selected parameters. It is primary intended to aid in debugging.

This command can also be used if a configuration utility needs to determine the current setting of controller.

$B2: Read software version number

Reply Byte #1: $C7 (Software version number)

Byte #2: First byte in version number, year 20 (00-99)

Byte #3: Second byte in version number, month (1-12)

Byte #4: Third byte in version number, day (1-31)

$B3: Read # of calibration points

Reply Byte #1: $CA (Acknowledge)

Byte #2: ($00 — no calibration done, $02 — 2 points, $05 — 5 points or $0D — 13 points)

$B4: Read stored calibration points

Reply Byte #1: $CA (Acknowledge)

Byte #2: ($00 — no calibration done, $02 — 2 points, $05 — 5 points or $0D — 13 points)

Byte #3: X-max (2 MSB for coordinate 1)

Byte #4: X-min (8 LSB for coordinate 1)

Byte #5: Y-max (2 MSB for coordinate 1)

Byte #6: Y-min (8 LSB for coordinate 1)

Continue until all coordinates have been sent. A zero is send back if calibration has not been performed and

there are no data bytes.

$B8: Set focus value

Byte #2: Focus value (0-63)

Reply Byte #1: $CA (Acknowledge)

Byte #2: Focus value (0-63)

The set focus command allows the setting of different values to improve touch screen focusing. Focusing is

defined as the ability of the touch screen controller to detect exactly identical coordinate values from

measurement to measurement if the pointer on the touch screen has not moved. The focus values are equivalent

to pixels of touch screen resolution. If for example a value of 2 is selected, this means that every coordinate

value that is within two pixels of the previously measured coordinate value is considered to be identical to that

previous value and that in this case the touch screen controller transmits the previous coordinate information.

This keeps the mouse pointer steady at the point being touched, rather than "jumping around" the point. A Focus

value of zero disables the focusing algorithm. The default setting is 4.

$BA: Set number of samples per coordinate

Byte #2: Number of samples per coordinate ($01 - 1 samples/coordinate, $02 - 2 samples/coordinate, $04

- 4 samples/coordinate, $08 - 8 samples/coordinate, $10 - 16 samples/coordinate, $20 - 32

samples/coordinate)

Reply Byte #1: $CA (Acknowledge)

Byte #2: Number of samples per coordinate ($01 - 1 samples/coordinate, $02 - 2 samples/coordinate, $04

- 4 samples/coordinate, $08 - 8 samples/coordinate, $10 - 16 samples/coordinate, $20 - 32

samples/coordinate)

This command allows the selection of different sample numbers per X, Y, and Z coordinates. The higher the

number of samples per X, Y, and Z coordinates, the better the accuracy, but the lower the coordinates per

second data rate. The default setting is 8.

$BB: Set communication mode

Byte #2: Communication mode ($01 = stream, $02 = touchdown, $04 = liftoff)

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Reply Byte #1: $CA (Acknowledge)

Byte #2: Communication mode ($01 = stream, $02 = touchdown, $04 = liftoff)

See the COMMUNICATION MODES section for a description of the stream, touchdown and liftoff modes. This

command selects the communication mode. The default setting is stream mode.

$BC: Set max delta

Byte #2: Max delta value (0-63)

Reply Byte #1: $CA (Acknowledge)

Byte #2: Max delta value (0-63)

See the Averaging Algorithm section for a detailed description of this setting. Simply put, this command sets how

much the "coordinate velocity" can change from one coordinate to the next. The default setting is 8.

$BD: Set calibration points

Byte #2: High nibble: Number of calibration points ($01 = two, $02 = five, $04 = thirteen)

Low nibble: Active calibration cross (1-13 = cross #)

Reply Byte #1: $CA (Acknowledge)

Byte #2: High nibble: Number of calibration points ($01=two, $02=five, $04=thirtheen)

Low nibble: Active calibration cross # (1-13)

Refer to the Calibration section for details.

$BE: Set minimum pressure

Byte #2: Minimum pressure value (0-127)

Reply Byte #1: $CA (Acknowledge)

Byte #2: Minimum pressure value (0-127)

This setting controls how high the pressure (Z-axis) must be in order for samples to be accepted. Setting this

value too low may result in having faulty coordinates accepted. This value is internally multiplied by two in the

controller (due to the 7-bit limitation in the communication format, which can not send 8-bit values larger than 127

in one byte). The default setting is 40.

$A0: Toggle disable/enable external filter path

Reply Byte #1: $CA (Acknowledge)

Byte #2: (0 = now disabled, 1 = now enabled)

This command enable/disable external filter path. The external filter path enabled option will require the addition

of a single external low pass filter (either R/C or active OpAmp based), which is then applied to the touch screen

signal lines. This option can be used in high noise environments to significantly improve performance and

accuracy of the touch screen controller.

The default setting is filter path enabled.

$A2: Toggle disable/enable self-power down

Reply Byte #1: $CA (Acknowledge)

Byte #2: (0 = now disabled, 1 = now enabled)

This command can switch between self-power down mode enable or disabled. Refer to the Power Save Mode

(Low Power Stand-by) section for details. The default setting is Self-Power Down mode enabled. If the echo

mode is enabled, any command byte send to the device will be echo back and executed.

$A3: Toggle disable/enable echo mode

Reply Byte #1: $CA (Acknowledge)

Byte #2: (0 = now disabled, 1 = now enabled)

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The echo mode is available for debugging purposes. If enabled, the touch screen controller will echo back any

data that is received via the UART interface.

The default setting is Echo mode disabled.

$A4: Toggle disable/enable pressure measurement

Reply Byte #1: $CA (Acknowledge)

Byte #2: (0 = now disabled, 1 = now enabled)

The pressure measurement sets the touch screen to also sample the Z-axis when reading the X and Y

coordinates.

The default setting is pressure measurement enabled.

$A5: Toggle disable/enable calibration checking.

Reply Byte #1: $CA (Acknowledge)

Byte #2: (0 = now disabled, 1 = now enabled)

If the cablibration checking is enabled, the cablibration mapping must be the values shown in ??? to ???.

$A7: Wakeup

There is no reply byte to this command.

When the self-power down mode of the device is enabled, the touch screen driver must send a wakeup

command prior to any command byte(s). If the self-power down mode of the TSC is enabled. The wakeup

command must also to be sent if the driver puts the TSC in power-down mode via the shutdown command.

$A8: Shutdown

Reply Byte #1: $CA (Acknowledge)

When the TSC driver wants the controller to go into power save mode it sends a shutdown command to the

controller. The driver needs to send a wakeup to the controller before starting up the communication again.

With the TSC has the self-power-down mode enabled, then a touchdown on the touch screen will wake-up the

TSC from shutdown mode in addition to sending the wake up command. If the self-power-down mode is

disabled, then only the wakeup command can wake-up the controller from shutdown mode (i.e. wake-up on

touchdown is disabled).

$AF: Soft reset (restart the controller)

Reply Byte #1: $CA (Acknowledge)

Byte #2: $CB/$CC (Self test OK/Self test fail)

When the PC driver sends the soft reset command, the touch screen controller executes a soft reset, which

clears and re-initializes all internal RAM configuration registers from on-chip FLASH and performs a self-check of

internal RAM and program memory.

CONTROLLER REPLIES

$CF: Timeout.

Communication timeout has occurred, and current command has been aborted.

$CE: Re-send

Request the TSC driver to resend the last command. This command is used if the controller does not understand

the received command or a buffer overrun condition occurs.

$CC: Self test fail (done at startup, reset, and after calibration)

$CB: Self test OK (done at startup, reset, and after calibration)

$CA: Acknowledge

$C4: Calibration coordinates OK

This is sent if the coordinates are within the predefined value.

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$C8: Error / TX Buffer overrun

This is added to the last place in transmit buffer to signal that a buffer overrun has occurred.

$C7: Software Version number

Byte #2: First byte of version number

Byte #3: Second byte of version number

Byte #4: Third byte of version number

$80: Format tablet for Z-axis disabled (see Data packet format table section for more info.)

Byte #2: Status, low X and low Y

Byte #3: High X

Byte #4: High Y

$90: Format tablet for Z-axis enabled (see Data packet format table section for more info.)

Byte #2: Status, low X and low Y

Byte #3: High X

Byte #4: High Y

Byte #5: Z-axis (0-127)

Oscillator

OSC_IN is the clock input while OSC_OUT is the clock generator output to the crystal. Table 2 shows the

component values required for various standard crystal values. Figure 5 shows the crystal oscillator connection

diagram.

Figure 5.

Table 2. Crystal Oscillator Configuration,

TA= 25°C, VCC = 5V

CKI Freq.

C1 (pF) C2 (pF) (MHz)

18 18 10

18–36 18–36 3.27

The crystal and other oscillator components should be placed in close proximity to the OSC_IN and OSC_OUT

pins to minimize printed circuit trace length.

The values for the external capacitors should be chosen to obtain the manufacturer's specified load capacitance

for the crystal when combined with the parasitic capacitance of the trace, socket, and package (which can vary

from 0 to 8 pF). The guideline in choosing these capacitors is:

Manufacturer's specified load cap = (C1* C2) / (C1+ C2)+Cparasitic

C2can be trimmed to obtain the desired frequency. C2should be less than or equal to C1.

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Power Save Mode (Low Power Stand-by)

The power consumption of the controller can be minimized by enabling the low power stand by mode. The power

save mode can be controlled internally by sending a command of $A2 to the controller, externally by pulling the

SHUTDOWN pin low, or by issuing a driver shutdown command of $A8.

The self power down mode is enabled/disabled by sending a command of $A2 to the controller. When enabled,

the controller automatically goes into low power stand by if no more touch activity is detected or if there is no

UART communication. The controller automatically comes out of low power stand by mode when a touch is

detected on the touch panel or if an incoming communication on the UART is detected. In the low power stand

by mode, all activity is disabled, including the oscillator. Also, the LED pin is driven high. To wake up the

controller on the UART, the wake up command byte must be sent, followed by a minimum time delay of 1ms for

the LM8500 and 3ms for the LM8300 before sending any command byte. The delay time is needed to allow the

oscillator to restart and stabilize. Table 3 shows the average startup time for a given operating frequency.

The SHUTDOWN pin will shut down the controller when pulled low. When the SHUTDOWN pin is pulled low, the

controller will continue to be in the low power stand by mode until the pin is pulled high or released. While the

SHUTDOWN pin is pulled low, all activities are stopped and any touch or communication will be ignored.

Immediately following the SHUTDOWN pin being released or pulled high, the controller clears the UART transmit

and receive buffers and resumes normal operation.

The controller can be put in the low power stand by mode by sending a $A8 command to it. Upon receiving this

command, the controller goes into low power stand by mode. If the self power down mode is enabled and the

controller is put into low power stand by mode, the controller will wake up if the wake up command ($A7) is

received or if a touch is detected on the touch panel. If the self power down mode is disabled and the controller

is put into low power stand by mode, the controller can only be woken up if it receives the wakeup command.

After the controller wakes up, the UART transmit and receive buffers are cleared and resume normal operation.

Table 3. Startup Times

CKI Frequency Startup Time

10 MHz 1–10 ms

3.33 MHz 3–10 ms

Averaging Algorithm

To achieve better accuracy and noise filtering, each X, Y, and Z coordinate is oversampled by specific amount.

The possible oversampling settings are 1, 2, 4, 8, 16, and 32. The factory setting is 8. The greater the

oversampling, the greater the accuracy, but the lower the CPPS.

Table 4. Samples per coordinate vs. CPPS for LM8300

Samples Coordinate pairs

per coordinate per second (CPPS)

1 250

2 220

4 190

8 150

16 100

32 65

Table 5. Samples per coordinate vs. CPPS for LM8500

Samples Coordinate pairs

per coordinate per second (CPPS)

1 500

2 430

4 360

8 270

16 190

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Table 5. Samples per coordinate vs. CPPS for LM8500 (continued)

32 110

DELTA ALGORITHM

The delta filter is used to remove large variations in sampled values due to noise and glitches. The delta filter

tries to predict where the next coordinate could be. This is done by taking the two previous coordinates and

subtracting one from the other, producing a delta value. This delta value is then added or subtracted to the last

coordinate. The resulting value is the predicted coordinate. If the new sampled coordinate is close to this

predicted value, then the new value is accepted as valid and is passed to the focus algorithm, provided the focus

algorithm is enabled. If the new sampled coordinate is not close to the predicted coordinate, then the value is

discarded and is stored to be used in the following delta calculations.

The number by which the new sampled coordinate can differ from the predicted coordinate is controlled by

setting the Set Max Delta value. The Set Max Delta value can be from a value of 0-63. The factory default is 8.

FOCUS ALGORITHM

The focus algorithm removes some inaccuracy and noise that could cause the coordinate to differ only by a

couple of pixels. The focus algorithm is used to eliminate the "jittering" effect of the pointer when the pointer is

stationary.

The focus algorithm compares the value of the previous stored value to the value passed from the delta

algorithm and determines if the difference is greater than or equal to the Set Focus Value. If the difference is

greater or equal to the value in Set Focus Value then the new coordinate is sent out through the UART and

stored as the previous value. If the difference is less than the Set Focus Value then the value is discarded and

the stored valued is set through the UART.

The amount of difference between the new coordinate and the old coordinate is set in the Set Focus Value. This

value can be from 0-63 with a value of 0 disabling the focus algorithm. The factory default is 4.

COMMUNICATION MODES

Liftoff

When set to the liftoff mode, the controller only sends data through the UART on liftoff. The controller

continuously samples the touchscreen as long as there is a touch detected on the touchscreen but only the last

coordinate is sent out to the UART.

Touchdown

When set to the touchdown mode, the controller only sends data through the UART on touchdown. The controller

continuously samples the touchscreen as long as there is a touch detected on the touchscreen but only the first

coordinate is sent out to the UART.

Streaming

When set to the streaming mode, the controller continuously sends data through the UART as long as there is a

touch detected on the touchscreen.

Brownout Reset

The device is initialized when the RESET pin is pulled low or the On-chip Brownout Reset is activated.

The RESET input initializes the device when pulled low. The RESET pin must be held low for a minimum of

0.5µs for the LM8500 and a minimum of 1.5µs for the LM8300 to guarantee a valid reset. Reset should also be

wide enough to ensure crystal start-up upon power-up. The R/C circuit shown in Figure 6 is an optional circuitry

that will provide a delay 5 times (5x) greater than the power supply.

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Figure 6. Optional Reset Circuit using External Reset

When enabled, the device generates an internal reset as VCC rises. While VCC is less than the specified brownout

voltage (Vbor), the device is held in the reset condition for tid = 120-128 µs for the LM8500 and tid = 360-384 µs

for the LM8300. Once the tid reaches zero, the internal reset is released and the controller resume normal

operation. This internal reset will perform the same functions as external reset. Once VCC is above the Vbor and tid

reaches zero, instruction execution begins. If, however, VCC drops below the selected Vbor, an internal reset is

generated, and tid is set to 120-128 µs for the LM8500 and 360-384 µs for the LM8300. The device now waits

until VCC is greater than Vbor, at which time the countdown starts over. When enabled, the functional operation of

the device, at frequency, is guaranteed down to the Vbor level.

One exception to the above is that the brownout circuit will insert a delay of approximately 3 ms on power up or

any time the VCC drops below a voltage of about 1.8V. The device will be held in Reset for the duration of this

delay before tid starts count down. This delay starts as soon as the VCC rises above the trigger voltage

(approximately 1.8V). This behavior is shown in Figure 7.

In Case 1, VCC rises from 0V and the on-chip RESET is undefined until the supply is greater than approximately

1.0V. At this time the brownout circuit becomes active and holds the device in RESET. As the supply passes a

level of about 1.8V, a delay of about 3 ms (td) is started and tid is preset with 120-128 µs for the LM8500 or 360-

384 µs for the LM8300. Once VCC is greater than Vbor and td has expired, tid starts to count down.

Case 2 shows a subsequent dip in the supply voltage which goes below the approximate 1.8V level. As VCC

drops below Vbor, the internal RESET signal is asserted. When VCC rises back above the 1.8V level, td is started.

Since the power supply rise time is longer for this case, td has expired before VCC rises above Vbor and tidstarts

immediately when VCC is greater than Vbor.

Case 3 shows a dip in the supply where VCC drops below Vbor, but not below 1.8V. On-chip RESET is asserted

when VCC goes below Vbor and tid starts as soon as the supply goes back above Vbor.

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Figure 7. Brownout Reset Operation

The internal reset will not be turned off until tid counts down to zero. The internal reset will perform the same

functions as external reset. The device is guaranteed to operate at the specified frequency down to the specified

brownout voltage. After the underflow, the logic is designed such that no additional internal resets occur as long

as VCC remains above the brownout voltage.

The device is relatively immune to short duration negative going VCC transients (glitches). Proper filtering of the

VCC power supply voltage is essential for proper brownout functionality. Power supply decoupling is vital even in

battery powered systems.

There are two optional brownout voltages. The part numbers for the two versions of this device are:

LM8500, Vbor = high voltage range.

LM8300, Vbor = low voltage range.

Refer to the device specifications for the actual Vbor voltages.

High brownout voltage devices are guaranteed to operate at 10MHz down to the high brownout voltage. Low

brownout voltage devices are guaranteed to operate at 3.33MHz down to the low brownout voltage. Low

brownout voltage devices are not guaranteed to operate at 10MHz down to the low brownout voltage.

Under no circumstances should the RESET pin be allowed to float. The RESET input may be connected to an

external pull-up resistor to VCC or to other external circuitry. The output of the brownout reset detector will always

preset tid to a value between 120-128µs for the LM8500 and 360-384µs for the LM8300. At this time, the internal

reset will be generated.

The device has a built in watchdog monitoring module to prevent runaway code. To use the watchdog feature,

the WD_OUT pin must be connected to the RESET pin. The WD_OUT pin has an internal weak pull-up so that,

when the WD_OUT pin is connected to the RESET pin, the RESET pin does not require an external pull-up

resistor to VCC.

Calibration

The device supports two, five, and thirteen point calibration. If desired, the calibration points can be stored

internally in the non-volatile storage element. During calibration time, the device has the unique ability to check if

the calibration points make sense. For instance, if the desired calibration point was to be at the upper left hand

corner, but by accident, the actual point detected was at the lower right hand corner, the device will reject this

point. This ensures the calibration process is not performed incorrectly.

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The calibration checking, can be enabled or disabled. If the calibration checking is enabled, the controller will

always check the current calibration point being done against the theoretical point and determine if the value is

within ±127 of the raw A/D values. If this option is desired, the touch screen driver must perform the calibration

according to the calibration mapping for the two, five, and thirteen points as shown in Figure 8,Figure 9, and

Figure 10, respectively. The theoretical values for the two, five, and thirteen points are shown in Table 6,Table 7,

and Table 8 respectively.

Figure 8. Two Points Calibration Mapping

Figure 9. Five Points Calibration Mapping

Figure 10. Thirteen Points Calibration Mapping

Table 6. Two Points Calibration

Calibration point Theoretical X-value Theoretical Y-value

1 127 127

2 895 895

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Table 7. Five Points Calibration

Calibration point Theoretical X-value Theoretical Y-value

1 127 127

2 895 895

3 127 895

4 511 511

5 895 127

Table 8. Thirteen Points Calibration

Calibration point Theoretical X-value Theoretical Y-value

1 127 127

2 895 895

3 127 895

4 511 511

5 895 127

6 895 511

7 511 895

8 127 511

9 511 127

10 623 319

11 623 623

12 319 623

13 319 319

GENERAL CALIBRATION PROCEDURES

Calibration is invoked by sending a command byte of $BD followed by a command byte to the device. The

command byte is broken into two parts: the high nibble states the number of calibration points to performs and

the lower nibble states the active calibration point. For example, to do the first calibration point for the two point

calibration, the command bytes of $BD and $11 are sent to the device. The device then echos $BD and $11

back to the TS driver and waits for a touch on the panel. When a touch is detected, the device checks to see if

the point is within the specified parameters if the calibration point checking is enabled. If the calibration point

checking is disabled, the device will send a $C8 for OK byte to the TS driver regardless of where the touch was

detected. This calibration point checking can be enabled or disabled by sending a command byte of $A5 to the

device. When all the calibration points are done, the device will do a self-test and send a command of $CB for

OK or a command of $CC for failed. If a $CC is received, the TS driver should issue a warning stating the

calibration was not done properly and redo the calibration procedures. The flowchart for the calibration

procedures is shown in Figure 11.

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Figure 11. Calibration Procedures with Coordinates Checking Enabled

CALIBRATION PROCEDURES WITH COORDINATES CHECKING ENABLED

To do TS calibration with coordinates checking enabled, first ensure the Calibration Coordinates Checking is

enabled on the device. This can be accomplished by sending a command byte of $B1 (Read Parameters

command) and checking the 5th bit of the 12th reply byte is set. Alternatively, if the device is set to Calibration

Coordinates Checking enabled as default, this step can be skipped.

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The TS driver sends the command byte to do calibration ($BD). The TS driver should wait for the reply bytes and

ensure it is the same command bytes it sent. The device waits for a touch to be detected on the panel. Once a

touch is detected, the device checks it against the predetermined calibration values as noted on Table 6,

Table 7 , and Table 8. If the detected touch is within the predefined value (±127 of the raw A/D value), the device

will send a command of $C4 to the TS driver and store the calibration point in the internal flash. The TS driver

can now send a command byte to do the next calibration point. If the detected touch is not within the predefined

value, the device will send a reply byte of $C8 to the TS driver. Upon receiving this reply byte, the TS driver can

resend the calibration command for the same calibration point, go the next calibration point, or abort the

calibration process.

Once all the calibration points are done, the device does a self-test. If the self-test was not successful, the device

will send a reply byte of $CC to the TS driver. At this point, the TS driver should either notify the user to redo the

calibration point or automatically redo the calibration again. If the self-test was successful, the device will send a

reply byte of $CB to the TS driver.

CALIBRATION PROCEDURES WITH COORDINATES CHECKING DISABLED

To do TS calibration with coordinates checking disabled, first ensure the Calibration Coordinates Checking is

disabled on the device. This can be accomplished by sending a command byte of $B1 (Read Parameters

command) and checking the 5th bit of the 12th reply byte is not set. Alternatively, if the device is set to

Calibration Coordinates Checking disabled as default, this step can be skipped.

The TS driver sends the command byte to do calibration ($BD). The TS driver should wait for the reply bytes and

ensure it is the same command bytes it sent. The device waits for a touch to be detected on the panel. Once a

touch is detected, the device save the values into the internal flash and send a reply byte of $C4 to the TS driver.

The TS driver can now send a command byte to do the next calibration point. Since the Calibration Checking is

disabled, the TS driver should ensure the calibration point is within the range of the calibration cross.

Once all the calibration points are done, the device does a self-test. If the self-test was not successful, the device

will send a reply byte of $CC to the TS driver. At this point, the TS driver should either notify the user to redo the

calibration point or automatically redo the calibration again. If the self-test was successful, the device will send a

reply byte of $CB to the TS driver.

Revision History

Date Section Summary of Changes

October 2002 Initial release.

May 2003 All sections Removed LM8400 part.

Brownout Reset Updated section to reflect the change and made external reset circuitry optional.

July 2003 Advanced Command Bytes Added command byte $A5

Descriptions Updated controller reply bytes

December 2003 Advanced Command Bytes Added description for command byte $A5

Descriptions

March 2013 All Sections Changed layout of National Data Sheet to TI format

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PACKAGE OPTION ADDENDUM

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Addendum-Page 1

PACKAGING INFORMATION

Orderable Device Status

(1)

Package Type Package

Drawing Pins Package

Qty Eco Plan

(2)

Lead/Ball Finish

(6)

MSL Peak Temp

(3)

Op Temp (°C) Device Marking

(4/5)

Samples

LM8300IMT9B/NOPB LIFEBUY TSSOP DGG 48 38 Green (RoHS

& no Sb/Br) CU SN Level-2-260C-1 YEAR 0 to 70 LM8300IMT9

LM8500IMT9B/NOPB LIFEBUY TSSOP DGG 48 38 Green (RoHS

& no Sb/Br) CU SN Level-2-260C-1 YEAR 0 to 70 LM8500IMT9

(1) The marketing status values are defined as follows:

ACTIVE: Product device recommended for new designs.

LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.

NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.

PREVIEW: Device has been announced but is not in production. Samples may or may not be available.

OBSOLETE: TI has discontinued the production of the device.

(2) RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance

do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may

reference these types of products as "Pb-Free".

RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption.

Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of <=1000ppm threshold. Antimony trioxide based

flame retardants must also meet the <=1000ppm threshold requirement.

(3) MSL, Peak Temp. - The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature.

(4) There may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device.

(5) Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuation

of the previous line and the two combined represent the entire Device Marking for that device.

(6) Lead/Ball Finish - Orderable Devices may have multiple material finish options. Finish options are separated by a vertical ruled line. Lead/Ball Finish values may wrap to two lines if the finish

value exceeds the maximum column width.

Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information

provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and

continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals.

TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.

In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.

PACKAGE OPTION ADDENDUM

www.ti.com 11-Apr-2018

Addendum-Page 2

MECHANICAL DATA

MTSS003D – JANUARY 1995 – REVISED JANUAR Y 1998

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

DGG (R-PDSO-G**) PLASTIC SMALL-OUTLINE PACKAGE

4040078/F 12/97

48 PINS SHOWN

0,25

0,15 NOM

Gage Plane

6,00

6,20 8,30

7,90

0,75

0,50

Seating Plane

0,27

0,17

1,20 MAX

0,08

0,10

0,50

0°–8°

14,10

13,90

DIM

A MAX

A MIN

PINS **

12,40

12,60

17,10

16,90

0,15

0,05

NOTES: A. All linear dimensions are in millimeters.

B. This drawing is subject to change without notice.

C. Body dimensions do not include mold protrusion not to exceed 0,15.

D. Falls within JEDEC MO-153

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life-critical medical equipment unless authorized officers of the parties have executed a special contract specifically governing such use.

Life-critical medical equipment is medical equipment where failure of such equipment would cause serious bodily injury or death (e.g., life

support, pacemakers, defibrillators, heart pumps, neurostimulators, and implantables). Such equipment includes, without limitation, all

medical devices identified by the U.S. Food and Drug Administration as Class III devices and equivalent classifications outside the U.S.

TI may expressly designate certain products as completing a particular qualification (e.g., Q100, Military Grade, or Enhanced Product).

Designers agree that it has the necessary expertise to select the product with the appropriate qualification designation for their applications

and that proper product selection is at Designers’ own risk. Designers are solely responsible for compliance with all legal and regulatory

requirements in connection with such selection.

Designer will fully indemnify TI and its representatives against any damages, costs, losses, and/or liabilities arising out of Designer’s non-

compliance with the terms and provisions of this Notice.

Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265