Infineon TLE9351SJ: A Multi-Channel LIN System Basis Chip for Automotive Body Control Applications

The evolution of automotive electronics demands highly integrated, robust, and cost-effective solutions, particularly for body control modules (BCMs) which manage a growing number of convenience and comfort functions. Addressing this need, the Infineon TLE9351SJ stands out as a highly integrated System Basis Chip (SBC) designed to serve as the central power and communication hub for sophisticated body electronics networks.

At its core, the TLE9351SJ is a multi-channel LIN transceiver system basis chip. Its primary function is to consolidate several critical functions that would typically require multiple discrete components onto a single piece of silicon. This high level of integration is paramount for reducing system complexity, saving space on the PCB, and enhancing overall reliability. The chip features two fully independent LIN system basis channels, each capable of operating as a LIN slave or being configured as a LIN master. This dual-channel architecture allows a single SBC to control two separate LIN networks or clusters of smart actuators and sensors, making it exceptionally versatile for complex door modules, seat control units, or smart junction boxes.

Beyond its communication capabilities, the TLE9351SJ excels in power management. It incorporates two high-efficiency voltage regulators (one pre-regulator and one 5V/3.3V regulator) to supply power to an external microcontroller and other logic circuits. Furthermore, it includes six high-side drivers configurable as current sources, ideal for directly driving LEDs for interior lighting or other resistive loads. For safety-critical applications, the device is equipped with a comprehensive suite of protection features and diagnostic functions, including over-voltage, under-voltage, and over-temperature protection, as well as failure mode feedback to the host microcontroller. This ensures robust operation in the harsh automotive environment, characterized by wide voltage fluctuations and extreme temperature ranges.

Compliant with the latest automotive quality and standards requirements, the TLE9351SJ is engineered for exceptional electromagnetic compatibility (EMC) and low electromagnetic emission (EME), which is critical for avoiding interference with other sensitive electronic systems in the vehicle. Its design focuses on achieving very low quiescent current, a key parameter for supporting modern energy management and automotive sleep/wake-up cycles, which are essential for minimizing battery drain when the vehicle is parked.

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The Infineon TLE9351SJ represents a significant advancement in automotive SBC design. By integrating dual LIN channels, robust power supplies, multiple drivers, and extensive diagnostic capabilities into a single package, it provides a compact, reliable, and cost-optimized foundation for next-generation automotive body control applications, simplifying design and accelerating time-to-market for manufacturers.

Keywords:

1. System Basis Chip (SBC)

2. LIN Transceiver

3. Automotive Body Control

4. Power Management

5. Diagnostic Functions