Overview
The L9679P is an advanced airbag IC designed for use in mature airbag systems and cut-off battery systems for integrated safety markets. This device is part of a family that includes the L9678 and L9680, offering enhanced safety system integration through higher power supply currents and an integrated PSI-5 satellite interface. It is AEC-Q100 qualified, ensuring high reliability and performance in automotive applications.
Key Specifications
| Parameter | Value |
|---|---|
| Package | TQFP 100 14x14x1.0 |
| Operating Temperature | -40°C to 95°C |
| Supply Voltage | 5.5 V minimum at device battery pin, 6.0 V to 18.0 V max |
| Boost Regulator Output Voltage | 23 V or 33 V ±5% |
| Buck Regulator Output Voltages | 12 V/14.75 V, 7.2 V/9 V ±4%, 3.3 V or 5.0 V ±3% |
| Deployment Voltage | 25 V max |
| Operating Frequency | 1.882 MHz |
| Number of Deployment Drivers | 8 high-side, 8 low-side |
| Remote Sensor Interface | PSI-5 satellite sensors, 2-channel remote sensor interface |
| SPI Communications | 32-bit SPI bus |
Key Features
- AEC-Q100 qualified for automotive reliability
- Boost regulator for energy reserve with user-selectable output voltage (23 V or 33 V ±5%)
- Buck regulators for remote sensor and microcontroller unit with various output voltages
- Integrated energy reserve crossover switch and capacitor value & ESR diagnostics
- Switch active output indicator and battery voltage monitor with wake-up control
- System voltage diagnostics with integrated ADC
- Squib/pyroswitch deployment drivers with current monitoring and FET tests
- High and low side driver FET tests and diagnostics
- PSI-5 satellite sensors interface with configurable protocols
- 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
The L9679P is designed for use in advanced airbag systems, particularly in mature airbag markets and integrated safety markets. It is suitable for applications requiring high reliability, advanced diagnostics, and robust power management. Key applications include:
- Automotive airbag systems
- Cut-off battery systems
- Integrated safety systems
- Remote sensor and pyroswitch management
Q & A
- What is the primary application of the L9679P?
The L9679P is primarily used in advanced airbag systems and cut-off battery systems for integrated safety markets. - What are the key features of the L9679P?
The device includes boost and buck regulators, PSI-5 satellite interface, deployment drivers, and various diagnostic features. - What is the operating temperature range of the L9679P?
The operating temperature range is -40°C to 95°C. - What are the output voltage options for the boost regulator?
The boost regulator output voltage can be set to 23 V or 33 V ±5%. - How many deployment drivers does the L9679P have?
The device has 8 high-side and 8 low-side deployment drivers. - What communication interface does the L9679P use?
The device uses a 32-bit SPI bus for global and remote sensor configuration. - Is the L9679P AEC-Q100 qualified?
Yes, the L9679P is AEC-Q100 qualified for automotive reliability. - What is the package type of the L9679P?
The package type is TQFP 100 14x14x1.0. - What are the remote sensor interface capabilities of the L9679P?
The device supports PSI-5 satellite sensors and a two-channel remote sensor interface. - Does the L9679P have built-in diagnostic features?
Yes, it includes various diagnostic features such as capacitor value & ESR diagnostics, system voltage diagnostics, and FET tests.
