Overview
The L9678PTR-S, produced by STMicroelectronics, is a system basis chip designed for automotive airbag systems, particularly targeting emerging market applications. This IC integrates multiple functionalities to provide a comprehensive solution for airbag and battery cut-off systems. It features an energy reserve voltage power supply, high-frequency boost regulator, and user-configurable linear power supplies, making it a versatile and reliable component for automotive safety systems.
Key Specifications
| Parameter | Specification |
|---|---|
| Package | LQFP 64 (10x10x1.4 mm) |
| Operating Voltage | Minimum 6 V |
| Operating Temperature | -40 °C to 95 °C |
| Boost Regulator Frequency | 1.882 MHz |
| Output Voltage | User selectable: 23 V or 33 V ±5% |
| Linear Regulators | 5.0 V and 7.2 V ±4% with external pass transistor, fully integrated 3.3 V ±4% |
| Battery Voltage Monitor | With shutdown control and wake-up control |
| Squib/Pyroswitch Deployment Drivers | 4 channel HSD/LSD, 25 V max, 1.2 A @ 2 ms and 1.75 A @ 0.5/0.7 ms |
| Remote Sensor Interface | Two channel PSI-5 (asynchronous mode), four channel hall-effect, resistive or switch sensor interface |
| Communication Interface | 32-bit SPI, ISO9141 transceiver |
| Integrated Oscillators | 7.5 MHz and 16 MHz |
| Temperature Sensor | Integrated |
| Watchdog Timer | Integrated |
| Certification | AEC-Q100 qualified |
Key Features
- Energy Reserve Voltage Power Supply: High-frequency boost regulator with user-selectable output voltage (23 V or 33 V ±5%).
- User Configurable Linear Power Supplies: 5.0 V and 7.2 V ±4% output voltages with external pass transistor, and a fully integrated 3.3 V ±4% linear regulator.
- Battery Voltage Monitor and Shutdown Control: With wake-up control to manage system power efficiently.
- Squib/Pyroswitch Deployment Drivers: Four independent high and low side drivers capable of deploying at 25 V max with various current profiles.
- Remote Sensor Interface: Two channel PSI-5 (asynchronous mode) and four channel hall-effect, resistive or switch sensor interface.
- Integrated ADC and Diagnostics: System voltage diagnostics with integrated ADC and various diagnostic features for deployment loops and sensors.
- Watchdog Timer and Oscillators: Integrated watchdog timer and two oscillators (7.5 MHz and 16 MHz).
- Temperature Sensor and LED Drivers: Integrated temperature sensor and dual channel configurable high-side/low-side LED drivers.
- ISO9141 Transceiver and SPI Communication: For robust communication and data exchange.
Applications
- Low End Airbag Systems: Designed to support the requirements of airbag systems in emerging markets.
- Cut-off Battery Systems: Manages battery cut-off functions efficiently.
- Pyro Fuse/Pyroswitch Management: Handles the deployment and management of pyro fuses and pyroswitches.
Q & A
- What is the L9678PTR-S used for?
The L9678PTR-S is used in automotive airbag systems and battery cut-off systems, particularly in emerging market applications.
- What is the operating voltage range of the L9678PTR-S?
The minimum operating voltage is 6 V.
- What are the output voltage options for the boost regulator?
The output voltage is user-selectable between 23 V and 33 V ±5%.
- What types of linear regulators are available on the L9678PTR-S?
The IC includes 5.0 V and 7.2 V ±4% linear regulators with external pass transistors and a fully integrated 3.3 V ±4% linear regulator.
- How many channels of squib/pyroswitch deployment drivers are available?
There are four independent high and low side drivers.
- What remote sensor interfaces are supported?
The IC supports two channel PSI-5 (asynchronous mode) and four channel hall-effect, resistive or switch sensor interfaces.
- Is the L9678PTR-S AEC-Q100 qualified?
Yes, the L9678PTR-S is AEC-Q100 qualified.
- What is the operating temperature range of the L9678PTR-S?
The operating temperature range is -40 °C to 95 °C.
- What communication interfaces are available on the L9678PTR-S?
The IC supports 32-bit SPI and ISO9141 transceiver.
- Does the L9678PTR-S have integrated oscillators?
Yes, it includes two integrated oscillators (7.5 MHz and 16 MHz).
