Overview
The L9680 is an advanced airbag system IC developed by STMicroelectronics, designed for mid/high-end automotive airbag applications and cut-off battery systems. This device is part of a family that includes the L9678 and L9679, offering enhanced safety system integration through higher power supply currents and an integrated active wheel speed sensor interface. The L9680 is AEC-Q100 qualified, ensuring it meets stringent automotive reliability standards. It features a high-frequency power supply design, which allows for cost reduction by using smaller and less expensive external components. The device also includes various diagnostic and monitoring capabilities to ensure system integrity and reliability.
Key Specifications
| Parameter | Description |
|---|---|
| Operating Voltage | 5.5 V minimum at device battery pin |
| Operating Temperature | -40 to 95 °C |
| Package | TQFP 100 14x14x1.0mm |
| Boost Regulator for Energy Reserve | 1.882 MHz operation, Iload = 70 mA max, Output voltage: 23 V/33 V ±5% |
| Buck Regulator for Remote Sensor | 1.882 MHz operation, Output voltage: 7.2 V/9 V ±4%, user configurable |
| Buck Regulator for Micro Controller Unit | 1.882 MHz operation, Output voltage: 3.3 V or 5.0 V ±3%, user selectable |
| Deployment Voltage | Maximum 25 V |
| Remote Sensor Interface | Four-channel, PSI-5 satellite sensors, Active wheel speed sensors |
| Communication Interface | 32-bit SPI communications |
Key Features
- AEC-Q100 qualified for automotive reliability
- Boost regulator for energy reserve with user-selectable output voltage (23 V/33 V ±5%)
- Buck regulators for remote sensor and microcontroller unit with user-configurable output voltages
- Integrated energy reserve crossover switch and capacitor diagnostics
- Battery voltage monitor and shutdown control with wake-up function
- System voltage diagnostics with integrated ADC
- Squib/pyroswitch deployment drivers with 12-channel HSD/LSD
- Current monitoring and diagnostics (Rmeasure, STB, STG & Leakage)
- High and low-side driver FET tests
- High-side safing switch regulator and enable control
- Four-channel remote sensor interface and active wheel speed sensors
- Three-channel GPO, HSD or LSD configurable with PWM 0-100% control
- Nine-channel hall-effect, resistive or switch sensor interface
- User customizable safing logic and specific disarm signal for passenger airbag
- Temporal and algorithmic Watchdog timers and end of life disposal interface
- Temperature sensor and 32-bit SPI communications
Applications
- Mid/High-end airbag systems
- Cut-off battery systems
- Pyro Fuse/Pyroswitch management
Q & A
- What is the primary application of the L9680 IC?
The L9680 IC is primarily used in advanced airbag systems for mid/high-end automotive applications and cut-off battery systems.
- What are the key power supply features of the L9680?
The L9680 features a boost regulator for energy reserve, buck regulators for remote sensors and microcontroller units, and an integrated energy reserve crossover switch. All regulators operate at 1.882 MHz.
- What is the operating temperature range of the L9680?
The operating temperature range of the L9680 is -40 to 95 °C.
- What communication interface does the L9680 use?
The L9680 uses a 32-bit SPI communication interface.
- What safety features does the L9680 include?
The L9680 includes various safety features such as squib/pyroswitch deployment drivers, high and low-side driver FET tests, and user customizable safing logic.
- How does the L9680 manage battery voltage?
The L9680 includes a battery voltage monitor and shutdown control with a wake-up function.
- What types of sensor interfaces are supported by the L9680?
The L9680 supports four-channel remote sensor interfaces, PSI-5 satellite sensors, active wheel speed sensors, and nine-channel hall-effect, resistive or switch sensor interfaces.
- Is the L9680 AEC-Q100 qualified?
Yes, the L9680 is AEC-Q100 qualified, ensuring it meets automotive reliability standards.
- What is the package type of the L9680?
The L9680 comes in a TQFP 100 14x14x1.0mm package.
- Does the L9680 have diagnostic capabilities?
Yes, the L9680 includes various diagnostic capabilities such as capacitor value and ESR diagnostics, current monitoring, and high and low-side driver FET tests.
