Overview
The L9177ATR is a sophisticated power management integrated circuit (PMIC) designed by STMicroelectronics, utilizing their proprietary BCD (Bipolar-CMOS-DMOS) technology. This device is tailored for controlling 2-cylinder internal combustion engines in low-end applications such as small motorcycles, K-cars, and nautical engines. The L9177ATR integrates a comprehensive set of power supplies and signal preprocessing peripherals, making it a robust solution for engine management systems.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Supply Voltage (VB, VB_1) | 6 to 18 | V |
| Output Current (Injector Drivers) | Minimum 1 A (2 A during in-rush) | A |
| Output Current (Stepper Motor Driver) | Minimum 500 mA (full step) | A |
| Output Current (O2 Sensor Heater) | Minimum 3 A | A |
| On Resistance (O2 Sensor Heater) | 0.5 Ω (worst case at Tj = 150 °C) | Ω |
| On Resistance (Stepper Motor Driver) | 2.6 Ω (worst case on the diagonal at Tj = 150 °C) | Ω |
| High Side Driver Current Limitation | 100 mA min. | mA |
| Operating Temperature Range | -40 to 150 | °C |
| Package Type | TQFP64 (10x10 mm), exposed pad down | - |
Key Features
- Integrated 5 V 300 mA main voltage regulator, 5 V 40 mA tracking regulator for sensor supply, and 2.5 mA 5 V standby regulator.
- Dual injector drivers, O2 sensor heater, and relay drivers controllable via parallel input or SPI interface.
- Stepper motor driver for double winding coil motor, used for engine idle speed control.
- Protected high side driver and current limited low side drivers with SR control to minimize emission.
- Variable Reluctance Sensor interface for indirect measurement of engine crank angle.
- K-line transceiver (ISO-9141 compatible) for data communication.
- Full diagnostics via 24-bit SPI interface, including over-temperature protection.
- AEC-Q100 compliant for automotive reliability.
Applications
The L9177ATR is designed for use in various low-end engine control applications, including:
- Small motorcycles
- K-cars
- Nautical engines
- Other 2-cylinder internal combustion engines
Q & A
- What is the primary function of the L9177ATR?
The L9177ATR is a PMIC designed to control 2-cylinder internal combustion engines in low-end applications.
- What are the key power supplies integrated into the L9177ATR?
The device includes a 5 V 300 mA main voltage regulator, a 5 V 40 mA tracking regulator, and a 2.5 mA 5 V standby regulator.
- How are the injector drivers and O2 sensor heater controlled?
These drivers can be controlled both via parallel input and SPI interface.
- What type of motor does the stepper motor driver support?
The stepper motor driver is designed for a double winding coil motor used for engine idle speed control.
- Does the L9177ATR support any communication interfaces?
Yes, it includes a K-line transceiver compatible with ISO-9141 for data communication.
- What kind of diagnostics does the L9177ATR provide?
The device provides full diagnostics via a 24-bit SPI interface, including over-temperature protection.
- Is the L9177ATR compliant with any automotive standards?
Yes, it is AEC-Q100 compliant for automotive reliability.
- What is the operating temperature range of the L9177ATR?
The operating temperature range is -40 to 150 °C.
- What is the package type of the L9177ATR?
The device is available in a TQFP64 package (10x10 mm) with an exposed pad for power dissipation optimization.
- What is the maximum output current of the O2 sensor heater?
The minimum guaranteed output current of the O2 sensor heater is 3 A.
