L9680 datasheet(6/277 Pages) STMICROELECTRONICS

Part #	L9680

Description	Automotive advanced airbag IC for mid/high end applications

Download	277 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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6 / 277 page

Contents

L9680

6/277

DocID029257 Rev 1

9.3

Remote sensor interface fault protection . . . . . . . . . . . . . . . . . . . . . . . . 184

9.3.1

Short to ground, current limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 184

9.3.2

Short to battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 185

9.3.3

Cross link . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 185

9.3.4

Leakage to battery, sensor open . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 185

9.3.5

Leakage to ground . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 185

9.3.6

Thermal shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 185

10

Watchdog timers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 186

10.1

Temporal watchdog (WD1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 186

10.1.1

Watchdog timer configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 187

10.1.2

Watchdog timer operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 188

10.2

Algorithmic watchdog (WD2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 189

10.3

Watchdog reset assertion timer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 191

10.4

Watchdog timer disable input (WDT/TM) . . . . . . . . . . . . . . . . . . . . . . . . 191

11

DC sensor interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 192

11.1

Passenger inhibit interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 194

12

Safing logic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 196

12.1

Safing logic overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 196

12.2

SPI sensor data decoding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 197

12.3

In-frame and out-of-frame responses . . . . . . . . . . . . . . . . . . . . . . . . . . . 204

12.4

Safing state machine operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 205

12.4.1

Simple threshold comparison operation . . . . . . . . . . . . . . . . . . . . . . . 205

12.5

Safing engine output logic (ARMxINT) . . . . . . . . . . . . . . . . . . . . . . . . . . 206

12.5.1

Arming pulse stretch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 209

12.6

Additional communication line . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 210

13

General purpose output (GPO) drivers . . . . . . . . . . . . . . . . . . . . . . . . 213

14

System voltage diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 216

14.1

Analog to digital algorithmic converter . . . . . . . . . . . . . . . . . . . . . . . . . . 221

15

Temperature sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 223

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