RESET_N

SPI/

Digital

BIAS

DIAG

VZ3

Z3

ZM3

GND3

DGND2

SOMI

SCLK

TZ0

VDDIO

CS_N

SIMO

AGND

VA1

TEST4

NC

GND2

ZM2

Z2

VZ2

NC

NC

NC

NC

VZ0

Z0

ZM0

GND0

TEST

VCC5

AMX_OUT

AGND1

SQREF2

SQREF1

DGND1

IWD

VADC

TEST2

VA2

TEST3

GND1

ZM1

Z1

VZ1

NC

NC

NC

NC

48

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

1

24

23

22

21

20

19

18

17

16

15

14

13

12

11

10

9

8

7

6

5

4

3

2

TPIC71004-Q1

www.ti.com

SLVSAT2

– FEBRUARY 2011

Quad-Channel Driver for Airbag Deployment

Check for Samples: TPIC71004-Q1

1

FEATURES

•

An External Pin Connection to the

Microprocessor ADC Supply for Ratio-metric

2

•

Quad-Channel Squib Drivers for Airbag

Squib Resistance Measurement

Application

•

40-V Pin Capability on All Pins (Except GNDx,

•

Loop Diagnostics Monitor and Reporting

AGND, DGND, VCC5, VDDIO, AMX_OUT)

•

Two Logic Inputs Providing Independent

•

Operating Ambient Temperature Range:

–40°C

Safety Logic for Enabling/Disabling

to 105

°C

Deployment

•

Thermally Enhanced 48-Pin TSSOP DCA

•

Four Independent Thermally Protected

PowerPad

™ Package

High-Side Drivers That can Source

Deployment or Diagnostic Current Level to

APPLICATIONS

Each Squib Load

•

Squib Drivers for Airbag Application

•

Four Independent Avalanche Voltage and

Thermally Protected Low-Side Drivers That

Can Sink Deployment or Diagnostic Current

Level From Each Squib Load

•

Each Output Capable of 1.2 A/1.75 A Firing

Current for Typical 2 ms/0.5 ms

•

SPI Slave Interface for Serial Bus

Communication with Parity Check

•

Firing VZx Voltage Range 10 V to 35 V,

Transients up to 40 V

•

Programmable Firing Time up to 8.2 ms

•

Common Load Current Settings for All

Deployment Loops, Using Registers

•

Individual Firing Current Timer Limit Set for

Each Deployment Loop, Using Registers

•

Firing Current Timer to Monitor Firing Current

Over Deployment Time for Each Deployment

Loop

•

Independent Switch Control for Both High- and

Low-Side Switches

•

Diagnostic Mode for Fault Checking

•

Internal Fault Monitoring for Safe Operation

•

A Multiplex-able Output Buffer for Analog

Voltage Measurements

•

Use of External Clamping devices on Squib

Pins is Not Required to Protect the

Deployment ASIC Against Substrate Injection

Effects During Deployment Due to Dynamic

Shorts to Ground

1

Please 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.

2

PowerPad is a trademark of Texas Instruments.

PRODUCTION DATA information is current as of publication date.

© 2011, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.