L9177A

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Automotive engine management control IC for small engines

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Product overview

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.

  • All features

    • AEC-Q100 qualified
    • Supply voltage from 6 V to 18 V
      • Basic functionality guaranteed down to 3.9 V
    • 5 V regulator up to 300 mA with thermal shutdown protection in current limitation condition
    • 5 V tracking regulator up to 40 mA and short to battery protection
    • 5 V standby regulator up to 2.5 mA
    • 2 channels injectors drivers
      • Parallel and serial driving
      • Output internally clamped to 60 V
      • Minimum overcurrent at 2.8 A
      • Ron 0.6 Ω worst case (at Tj = 150 °C)
    • 3 relay drivers
      • 2 with parallel and serial driving, 1 with serial driving
      • Output internally clamped to 45 V
      • Minimum guaranteed output current 1 A
      • Ron 1.5 Ω worst case (at Tj = 150 °C)
    • Tachometer driver
      • Parallel and serial driving
      • Minimum guaranteed output current 25 mA
      • Ron 5 Ω worst case (at Tj = 150 °C)
    • Current limited low side driver (LSD)
      • Serial driving
      • Output internally clamped to 45 V
      • Minimum guaranteed output current 1 A (2 A during in-rush)
      • Ron 1.5 Ω worst case (at Tj = 150 °C)
    • Stepper motor driver
      • Parallel driving
      • Minimum guaranteed output current 500 mA - full step
      • Ron 2.6 Ω worst case on the diagonal (at Tj = 150 °C)
    • O2 sensor heater
      • Parallel and serial driving
      • Output internally clamped to 45 V
      • Minimum guaranteed output current 3 A
      • Ron 0.5 Ω worst case (at Tj = 150 °C)
    • Protected high side driver
      • 100 mA min. current limitation threshold
    • Full diagnosis by SPI
      • Injector driver: OL, STG, OC
      • Relay and current limited LSD drivers: OL, STG, OC
      • O2 sensor heater: OL, STG, OC
      • Tachometer: OL, STG, OC
      • Stepper motor driver: OL, STG, STB, OC
      • general diagnostic: over-temperature
    • Protection for STB, STG (for stepper motor drivers and tracking regulator)
    • Self configuring variable reluctance sensor interface
    • K-line transceiver
    • Microcontroller reset logic
    • Small Factor form package TQFP64 10 x 10 mm exposed pad down

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The current status of a product:
Active: Product is in volume production
Evaluation: Product is under characterization. Limited Engineering samples available
Preview: Product is in design stage
Target: Product is in design feasibility stage.No commitment taken to produce
Proposal: Marketing proposal for customer feedback.No commitment taken to design or produce
NRND: Not Recommended for New Design.Product is in volume production only to support customers ongoing production.
Marketing description of the package type.Compliancy of the device with industry requirement domains (IRD)The RoHS status of a product:
ECOPACK 1: Initial grade to identify European RoHS compliant products.
ECOPACK 2: New grade to identify brominated chlorinated and antimony oxide flame retardant free products.
ECOPACK 3: Halogen free RoHS exemptions free products.
(*): ECOPACK 2 version available upon request.
(**): Some versions still existing in ECOPACK 1 or not compliant.
The current status of a product:
Active: Product is in volume production
Evaluation: Product is under characterization. Limited Engineering samples available
Preview: Product is in design stage
Target: Product is in design feasibility stage.No commitment taken to produce
Proposal: Marketing proposal for customer feedback.No commitment taken to design or produce
NRND: Not Recommended for New Design.Product is in volume production only to support customers ongoing production.
Budgetary PriceMarketing description of the package type.Storage method used to contain product.Main country of assembly or fabrication of the product.ECCNs are five character alpha-numeric designations used on the Commerce Control List to identify dual-use items for export control purposes. ECCNs are five character alpha-numeric designations used on the Commerce Control List to identify dual-use items for export control purposes.The value as specified by level (minTypMax) of the ambient temperature (in Cel) in which this item was designed to operate.The value as specified by level (minTypMax) of the ambient temperature (in Cel) in which this item was designed to operate.The value as specified by level (minTypMax) of the ambient temperature (in Cel) in which this item was designed to operate.