Overview
The L9679E, produced by STMicroelectronics, is an extension chip designed for airbag systems and pyroswitch management. It is family-compatible with the L9679 and L9680 devices. This IC is specifically tailored for automotive applications, particularly in advanced airbag systems and battery cut-off circuits. The device integrates various critical functions, including deployment drivers, remote sensor interfaces, and comprehensive diagnostics, making it a robust solution for safety-critical automotive systems.
Key Specifications
| Parameter | Description | Value |
|---|---|---|
| Package | TQFP48 exposed pad down | 7x7x1.0 mm |
| Operating Temperature | -40 °C to 105 °C | |
| Deployment Voltage | Maximum deployment voltage | 25 V |
| Deployment Drivers | High-side and low-side drivers | 8 channels each |
| Remote Sensor Interface | PSI-5 satellite sensors | Four-channel, asynchronous/synchronous protocols |
| SPI Communications | Global and satellite communication buses | 32-bit, with parity bit |
| ADC Measurements | Integrated ADC converter | 1 converter |
| Power Supply | VCC voltage supply | 3.3 V to 5.5 V |
| Qualification | AEC-Q100 qualified |
Key Features
- AEC-Q100 Qualified: Ensures the device meets stringent automotive quality standards.
- Squib/Pyroswitch Deployment Drivers: 8-channel high-side and low-side drivers with programmable deployment profiles and current monitoring.
- Remote Sensor Interface: Four-channel PSI-5 satellite sensor interface with configurable asynchronous/synchronous protocols.
- Configurable Arming Inputs: Independent configurable arming inputs for programmable mapping of deployment loops.
- Temperature Sensor: Integrated temperature sensor for monitoring environmental conditions.
- SPI Communications: Two 32-bit SPI buses (global and satellite) with parity bit for reliable communication.
- Integrated ADC Measurements: Single ADC converter for various measurements.
- Power Management: Integrated power management system with internal regulators and supply voltage monitoring.
- Diagnostics: Comprehensive diagnostics including high- and low-side FET tests, resistance measurement, and leakage diagnostics.
Applications
- Airbag Systems: Designed for advanced airbag systems, providing reliable deployment and sensor interface capabilities.
- Pyroswitch Management: Manages pyroswitches in various automotive safety systems.
- Cut-off Battery Systems: Used in battery cut-off circuits to ensure safe and controlled battery management.
Q & A
- What is the primary function of the L9679E IC?
The L9679E IC is primarily used as an extension chip in airbag systems and pyroswitch management, providing deployment drivers, remote sensor interfaces, and diagnostics.
- What is the operating temperature range of the L9679E?
The operating temperature range of the L9679E is -40 °C to 105 °C.
- How many deployment drivers does the L9679E have?
The L9679E has 8 high-side and 8 low-side deployment drivers.
- What type of sensor interface does the L9679E support?
The L9679E supports a four-channel PSI-5 satellite sensor interface.
- What communication protocol does the L9679E use?
The L9679E uses 32-bit SPI communications with a parity bit, supporting both global and satellite communication buses.
- Is the L9679E AEC-Q100 qualified?
Yes, the L9679E is AEC-Q100 qualified, ensuring it meets automotive quality standards.
- What is the maximum deployment voltage of the L9679E?
The maximum deployment voltage of the L9679E is 25 V.
- Does the L9679E have integrated power management?
Yes, the L9679E has an integrated power management system with internal regulators and supply voltage monitoring.
- What types of diagnostics does the L9679E support?
The L9679E supports various diagnostics, including high- and low-side FET tests, resistance measurement, and leakage diagnostics.
- In what package is the L9679E available?
The L9679E is available in a 48-pin TQFP package with an exposed pad down.
