L9680 datasheet(25/286 Pages) STMICROELECTRONICS

25 / 286 page

DS11615 Rev 7

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L9680

Overview and block diagram

285

5.3

Remote sensor interfaces



Quad channel receiver, user selectable

–

standard PSI-5 v1.3 compatible with sync pulse or

–

active wheel speed sensors



High-side drivers for active wheel speed sensor mode (with driver protection)



Current limit with short circuit protection diagnostics



PSI-5 satellite sensor mode

–

Auto-adjusting current trip points for each satellite channel

–

Even parity, 8 or 10 bit messages, 125k or 189kbps

–

Satellite message error detection



Active wheel speed sensor mode

–

Standard active dual level sensors, 7ma/14ma

–

Three-level sensors with direction and air gap data, 7ma/14ma/28ma

–

PWM encoded two-level sensor, 2 edges/tooth

–

PWM encoded two-level sensor, 1 edge/tooth

–

Standard active two and three level sensor data decoding available through SPI

5.4

DC sensor interfaces



Nine integrated switch interfaces with current sense capability



Compatible with hall-effect, resistive and switch sensors



Current limit protected



System dedicated path to disable the passenger airbag with input from DC sensor

interface

5.5

General purpose outputs



Three configurable high-side or low-side drivers



ON-OFF mode and PWM 0-100% fine control



Diagnostics for short circuit protection and open load detection



Current limit and reverse battery protected

5.6

Arming logic



User configurable safing algorithms with 16 safing records



Four digital sensor interfaces through SPI



Independent user programmable thresholds



Independent user programmable latch timers



Four discrete and independent arming logic outputs



Four discrete and independent internal arming signals



End-of-life interface

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