Overview
The L9663-1, produced by STMicroelectronics, is an Automotive PSI5 Transceiver IC designed for use in automotive sensor applications. It is part of the Peripheral Sensor Interface (PSI5) standard, which is an open standard based on existing sensor interfaces. This device is particularly suited for safe and critical applications such as airbag systems, power train, chassis, and other safety-related domains. The L9663-1 supports both PSI5 revisions 1.3 and 2.1, offering a flexible and universal solution for multiple sensor applications. It operates in both asynchronous and synchronous modes and can be configured in point-to-point or bussed mode.
Key Specifications
| Specification | Value |
|---|---|
| Package | VFQFPN28 |
| PSI5 Compatibility | Revisions 1.3 and 2.1 |
| Data Transmission Speed | 125 kbps (optional 83.3 kbps and 189 kbps) |
| Operating Voltage | VB = 4.8 V (5.2 V for sync pulses) |
| Ambient Temperature Range | -40°C to 140 °C |
| Interface | 32-bit SPI with address multiplexing |
| EMC Robustness | High EMC robustness and low emission |
| Protection Features | Reverse voltage protection, short to ground tolerant with ±1.5 V ground shift |
| Supply Configuration | Integrated charge pump stage for pre-regulation with spread spectrum approach |
Key Features
- Manchester coded digital data transmission
- Bootstrap circuits for sync pulses
- Current limitation and voltage clamp on interface pins
- Integrated FLL module for high accuracy timing control
- Integrated charge pump stage for pre-regulation with spread spectrum approach
- Reverse voltage protection structure
- Short to ground tolerant with ±1.5 V ground shift
- 32-bit SPI interface with address multiplexing
- High EMC robustness and low emission
Applications
The L9663-1 is primarily used in automotive sensor applications, including:
- Airbag systems
- Power train applications
- Chassis and safety applications
- Other safety-critical automotive systems
It is designed to provide a reliable and flexible interface for connecting sensors to the Electronic Control Unit (ECU) in vehicles.
Q & A
- What is the PSI5 standard, and how does the L9663-1 comply with it?
The PSI5 standard is an open interface for automotive sensor applications. The L9663-1 complies with both PSI5 revisions 1.3 and 2.1, supporting asynchronous and synchronous operations.
- What are the key data transmission speeds supported by the L9663-1?
The L9663-1 supports data transmission speeds of 125 kbps, with optional speeds of 83.3 kbps and 189 kbps.
- What is the operating voltage range for the L9663-1?
The operating voltage range for the L9663-1 is VB = 4.8 V (5.2 V for sync pulses).
- What protection features does the L9663-1 offer?
The L9663-1 offers reverse voltage protection and is short to ground tolerant with ±1.5 V ground shift.
- How does the L9663-1 manage power supply for the sensors?
The L9663-1 includes an integrated charge pump stage for pre-regulation with a spread spectrum approach to manage power supply for the sensors.
- What interface does the L9663-1 use for communication with the microcontroller?
The L9663-1 uses a 32-bit SPI interface with address multiplexing for communication with the microcontroller.
- What are the ambient temperature range and EMC characteristics of the L9663-1?
The L9663-1 operates within an ambient temperature range of -40°C to 140 °C and offers high EMC robustness and low emission.
- Can the L9663-1 be used in both point-to-point and bussed modes?
- How does the L9663-1 handle timeslot monitoring (TSM)?
The L9663-1 provides several methods for implementing timeslot monitoring, including a simple TSM option that monitors timeslot end times.
- What are the diagnostic features available on the L9663-1?
The L9663-1 implements various diagnostic checks, including OFF and ON diagnostic phases to monitor and detect deviations from expected operation.
