L9177A datasheet(2/55 Pages) STMICROELECTRONICS

2 / 55 page

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Full diagnosis by SPI

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Injector driver: OL, STG, OC

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Relay and current limited LSD drivers: OL, STG, OC

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O2 sensor heater: OL, STG, OC

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Tachometer: OL, STG, OC

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Stepper motor driver: OL, STG, STB, OC

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general diagnostic: over-temperature

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Protection for STB, STG (for stepper motor drivers and tracking regulator)

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Self configuring variable reluctance sensor interface

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K-line transceiver

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Microcontroller reset logic

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Small Factor form package TQFP64 10 x 10 mm exposed pad down

Description

L9177A is a device realized in ST BCD proprietary technology, able to provide the

full set of power supplies and signal preprocessing peripherals needed to control a 2

Cylinder internal combustion Engine for Low End Application (e.g. small motorcycle,

K-car, nautical engines, etc.).

L9177A integrates a 5 V 300 mA main voltage regulator, a 5 V 40 mA tracking

regulator for sensor supply and a 2.5 mA 5 V standby regulator.

The two channels injector drivers, the O2 sensor heater and two relay drivers can be

controlled both with parallel input and with SPI interface. One additional relay driver

and the current limited low side driver are controlled by SPI. The stepper motor driver

is designed for a double winding coil motor, used for engine idle speed control.

Low side drivers implement SR control to minimize emission.

A protected 50 mA high side driver is provided.

A Variable Reluctance Sensor interface allows the connection to a commercial

magnetic pick-up, allowing the indirect measurement of internal combustion engine

crank angle. A K-line (standard ISO-9141 compatible) is provided as data

communication interface.

All functionalities are fully protected and provide complete diagnostics via a 24-bit

SPI interface. An overall protection against over temperature is provided as well.

The device is available in TQFP64 10x10 mm package with exposed pad for power

dissipation optimization.

L9177A

DS12175 - Rev 5

page 2/55

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