Overview
The L9679BTR is an advanced airbag IC designed by STMicroelectronics for use in automotive airbag systems. It is part of a family of devices that include the L9679 and L9680, offering comprehensive functionality for airbag deployment and safety system integration.
This device is tailored for mature airbag markets and integrated safety systems, providing advanced features such as energy reserve management, remote sensor interfaces, and extensive diagnostics.
Key Specifications
| Parameter | Description |
|---|---|
| Manufacturer | STMicroelectronics |
| Part Number | L9679BTR |
| Package | 100-pin package (for similar models, exact package for L9679BTR may vary) |
| Operating Voltage | Minimum 5.5 V at device battery pin |
| Operating Temperature | -40°C to 95°C |
| Boost Regulator | Output voltage user selectable, 23 V/ 33 V ±5% |
| Buck Regulators | Multiple buck regulators with user-configurable output voltages (e.g., 7.2 V/9 V, 12 V/14.75 V, 3.3 V or 5.0 V) |
| Deployment Drivers | 8 high-side and 8 low-side deployment drivers with programmable current and time settings |
| Remote Sensor Interfaces | PSI-5 satellite sensor interface with auto-adjusting current trip points and error detection |
| Communication Interface | 32-bit SPI bus for global and remote sensor configuration and control |
| Diagnostics | Extensive diagnostics including capacitor value & ESR, squib/pyroswitch resistance measurement, and system voltage diagnostics |
Key Features
- AEC-Q100 qualified for automotive applications
- Boost regulator for energy reserve with user-selectable output voltage (23 V or 33 V)
- Multiple buck regulators for various system components (e.g., remote sensors, microcontroller unit)
- Integrated energy reserve crossover switch and capacitor diagnostics
- Deployment drivers with programmable current and time settings, and firing current monitoring
- PSI-5 satellite sensor interface with auto-adjusting current trip points and error detection
- 32-bit SPI bus for global and remote sensor configuration and control
- Extensive diagnostics including capacitor value & ESR, squib/pyroswitch resistance measurement, and system voltage diagnostics
- Battery voltage monitor and shutdown control with wake-up function
- Temperature sensor and independent thermal shutdown protection
- User-customizable safing logic and specific disarm signal for passenger airbag
- Temporal and algorithmic Watchdog timers and end of life disposal interface
Applications
The L9679BTR is designed for use in advanced airbag systems in the automotive industry. It is suitable for:
- Mature airbag markets requiring sophisticated safety features
- Integrated safety systems including cut-off battery systems
- Remote sensor and deployment driver management in airbag systems
- Automotive safety applications requiring high reliability and diagnostic capabilities
Q & A
- What is the primary application of the L9679BTR?
The L9679BTR is primarily used in advanced airbag systems for the automotive industry.
- What are the key features of the boost regulator in the L9679BTR?
The boost regulator offers user-selectable output voltages of 23 V or 33 V with ±5% accuracy and includes capacitor diagnostics.
- How many deployment drivers does the L9679BTR have?
The device has 8 high-side and 8 low-side deployment drivers.
- What communication interface does the L9679BTR use?
The device uses a 32-bit SPI bus for global and remote sensor configuration and control.
- What are the operating temperature and voltage ranges for the L9679BTR?
The operating temperature range is -40°C to 95°C, and the minimum operating voltage is 5.5 V at the device battery pin.
- Does the L9679BTR support remote sensor interfaces?
Yes, it supports PSI-5 satellite sensor interfaces with auto-adjusting current trip points and error detection.
- What kind of diagnostics does the L9679BTR offer?
The device offers extensive diagnostics including capacitor value & ESR, squib/pyroswitch resistance measurement, and system voltage diagnostics.
- Is the L9679BTR AEC-Q100 qualified?
Yes, the L9679BTR is AEC-Q100 qualified for automotive applications.
- How does the L9679BTR manage power supply and crossover functions?
The power supply and crossover functions are controlled automatically through an internal state machine and wake-up input function.
- Does the L9679BTR have temperature monitoring and thermal shutdown protection?
Yes, it includes a temperature sensor and independent thermal shutdown protection for remote sensor interfaces.
