Overview
The L9680TR, produced by STMicroelectronics, is an advanced airbag IC designed for mid/high-end applications in the automotive sector. This device is part of a family that includes the L9678 and L9679, and it is optimized for use in mature airbag markets as well as in cut-off battery systems for integrated safety markets. The L9680TR integrates multiple power supply regulators, sensor interfaces, and safety features, making it a comprehensive solution for advanced airbag systems.
Key Specifications
| Parameter | Description |
|---|---|
| Operating Frequency | 1.882 MHz |
| Maximum Load Current (Boost Regulator) | 70 mA |
| Output Voltage (Boost Regulator) | User selectable: 23 V / 33 V ±5% |
| Output Voltage (PSI-5 SYNC Pulse) | User configurable: 12 V / 14.75 V |
| Output Voltage (Remote Sensor Buck Regulator) | User configurable: 7.2 V / 9 V ±4% |
| Output Voltage (Microcontroller Unit Buck Regulator) | User selectable: 3.3 V / 5.0 V ±3% |
| Energy Reserve Crossover Switch | 3 Ω - 912 mA max |
| Battery Voltage Monitor | With shutdown control and Wake-up control |
| Operating Temperature | -40 to 95 °C |
| Package | TQFP 100 (14x14x1.0mm) |
| RoHS Compliance | Ecopack2 |
Key Features
- AEC-Q100 qualified
- Boost regulator for energy reserve with user-selectable output voltage (23 V / 33 V ±5%)
- Boost regulator for PSI-5 SYNC pulse with user-configurable output voltage (12 V / 14.75 V)
- Buck regulator for remote sensor with user-configurable output voltage (7.2 V / 9 V ±4%)
- Buck regulator for microcontroller unit with user-selectable output voltage (3.3 V / 5.0 V ±3%)
- Integrated energy reserve crossover switch with switch active output indicator
- Battery voltage monitor and shutdown control with Wake-up control
- System voltage diagnostics with integrated ADC
- Squib/pyroswitch deployment drivers with 12-channel HSD/LSD and 25 V max deployment voltage
- Current monitoring and diagnostics (Rmeasure, STB, STG & Leakage diagnostics)
- High & low-side driver FET tests
- High-side safing switch regulator and enable control
- Four-channel remote sensor interface for PSI-5 satellite sensors 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
- Specific disarm signal for passenger airbag
- Temporal and algorithmic Watchdog timers
- End of life disposal interface
- Temperature sensor
- 32-bit SPI communications
Applications
- Mid/High end airbag systems
- Cut-off battery systems
- Pyro Fuse/Pyroswitch management
Q & A
- What is the operating frequency of the L9680TR?
The operating frequency of the L9680TR is 1.882 MHz.
- What are the user-selectable output voltages for the boost regulator?
The user-selectable output voltages for the boost regulator are 23 V and 33 V ±5%.
- What is the maximum deployment voltage for squib/pyroswitch drivers?
The maximum deployment voltage for squib/pyroswitch drivers is 25 V.
- Does the L9680TR support remote sensor interfaces?
- What is the operating temperature range of the L9680TR?
The operating temperature range of the L9680TR is -40 to 95 °C.
- Is the L9680TR AEC-Q100 qualified?
- What type of package does the L9680TR come in?
The L9680TR comes in a TQFP 100 package (14x14x1.0mm).
- Does the L9680TR have integrated diagnostics?
- Can the output voltage for the microcontroller unit be configured?
- Does the L9680TR support Watchdog timers?
