Overview
The L9177TR, produced by STMicroelectronics, is a specialized integrated circuit designed for low-end engine control applications. It is fabricated using ST's proprietary BCD (Bipolar, CMOS, DMOS) technology, which enables the integration of a wide range of power supplies and signal preprocessing peripherals. This device is packaged in a PowerSO-46 package, making it suitable for various automotive and industrial control systems.
Key Specifications
| Parameter | Specification |
|---|---|
| Supply Voltage | 6 V to 18 V (basic functionality guaranteed down to 3.9 V) |
| 5 V Regulator | Up to 300 mA with thermal shutdown protection |
| 5 V Tracking Regulator | Up to 40 mA with short to battery protection |
| 5 V Standby Regulator | Up to 2.5 mA |
| Injector Drivers | 2 channels, parallel and serial driving, output internally clamped to 60 V, minimum overcurrent at 2.8 A |
| Relay Drivers | 3 channels, output internally clamped to 45 V, minimum guaranteed output current 1 A |
| Tachometer Driver | Parallel and serial driving, minimum guaranteed output current 25 mA |
| Lamp Driver | Serial driving, output internally clamped to 45 V, minimum guaranteed output current 1 A (2 A during in-rush) |
| Stepper Motor Driver | Parallel driving, minimum guaranteed output current 500 mA - full step |
| O2 Sensor Heater | Parallel and serial driving, output internally clamped to 45 V, minimum guaranteed output current 3 A |
| High Side Switch | 100 mA min. current limitation threshold |
| Diagnostic Capabilities | Full diagnosis by SPI for various drivers and general over-temperature protection |
| Package | PowerSO-46 |
Key Features
- Multiple voltage regulators: 5 V regulator up to 300 mA, 5 V tracking regulator up to 40 mA, and 5 V standby regulator up to 2.5 mA.
- Injector drivers with parallel and serial driving capabilities, internally clamped to 60 V.
- Relay drivers and lamp drivers with internal clamping to 45 V.
- Tachometer driver and stepper motor driver with specific driving capabilities.
- O2 sensor heater with high current output.
- Protected high side switch with current limitation threshold.
- Full diagnostic capabilities via SPI for various drivers and over-temperature protection.
- Self-configuring variable reluctance sensor interface and K-line transceiver.
Applications
The L9177TR is primarily designed for low-end engine control systems in the automotive sector. It can be used in various applications such as:
- Engine control units (ECUs) for managing fuel injection, ignition timing, and other engine parameters.
- Automotive lighting and accessory control systems.
- Relay and actuator control in industrial and automotive environments.
- Oxygen sensor heating and monitoring systems.
- Stepper motor control in automotive and industrial automation.
Q & A
- What is the primary function of the L9177TR? The L9177TR is designed to provide a full set of power supplies and signal preprocessing peripherals for low-end engine control applications.
- What is the operating voltage range of the L9177TR? The device operates from 6 V to 18 V, with basic functionality guaranteed down to 3.9 V.
- What types of drivers are included in the L9177TR? The device includes injector drivers, relay drivers, tachometer driver, lamp driver, stepper motor driver, and O2 sensor heater.
- What is the maximum current output of the 5 V regulator? The 5 V regulator can supply up to 300 mA.
- Does the L9177TR have diagnostic capabilities? Yes, it has full diagnostic capabilities via SPI for various drivers and general over-temperature protection.
- What package type is the L9177TR available in? The L9177TR is packaged in a PowerSO-46 package.
- What is the purpose of the high side switch in the L9177TR? The high side switch has a minimum current limitation threshold of 100 mA.
- Can the L9177TR be used in industrial applications? Yes, it can be used in industrial control systems for relay and actuator control, among other applications.
- Does the L9177TR support stepper motor control? Yes, it includes a stepper motor driver with parallel driving capability.
- What communication interface does the L9177TR use for diagnostics? The device uses the SPI (Serial Peripheral Interface) for diagnostics.
