Infineon TLE7257SJ LIN Bus Transceiver: Features and Application Overview

The Infineon TLE7257SJ is a highly integrated local interconnect network (LIN) transceiver designed to serve as the physical layer interface between a LIN master/slave protocol controller and the LIN bus. Complying with the latest LIN 2.x and SAE J2602 standards, it is a robust solution for in-vehicle networking in body control and convenience systems.

Key Features and Technical Advantages

The TLE7257SJ stands out with its comprehensive feature set tailored for the demanding automotive environment. A primary feature is its extremely low power consumption in sleep mode, typically drawing just 6 µA, which is critical for preserving battery life in always-connected vehicles. It supports a wide supply voltage range from 5.5 V to 27 V, accommodating load dump conditions and ensuring stable operation through voltage fluctuations.

Its integrated wake-up functionality is sophisticated; the device can be woken up not only by a host microcontroller but also by LIN bus wake-up patterns and local wake-up via the WAKE pin. This flexibility is essential for complex network management. For enhanced system diagnostics and robustness, it includes over-temperature and undervoltage detection, with the status reported to the microcontroller (MCU). Furthermore, it offers excellent electromagnetic compatibility (EMC) and high electrostatic discharge (ESD) protection (up to ±6 kV on the LIN pin according to IEC 61000-4-2), safeguarding the system against electrical transients.

Application Overview

The TLE7257SJ is engineered for a broad spectrum of automotive applications, particularly those within distributed body control modules. Its primary role is to enable reliable, low-cost, and simple communication for sub-networks where the high speed of CAN is unnecessary.

Typical use cases include:

Comfort Systems: Controlling power windows, sunroofs, seat adjustment modules, and mirror folding.

Door Control Modules: Managing window lifters, door locks, and mirror adjusters.

Sensor Actuator Nodes: Interfacing with sensors for rain/light, climate control, and steering wheel switches.

Smart Switches and Lighting: Controlling interior lighting and simple ON/OFF functions.

In these applications, the TLE7257SJ acts as the reliable gateway, translating digital commands from the local MCU into a standardized, robust signal on the single-wire LIN bus and vice-versa.

ICGOOODFIND

The Infineon TLE7257SJ is a premier choice for automotive designers, offering a blend of ultra-low quiescent current, robust protection features, and full LIN standard compliance. It provides a reliable and cost-optimized physical layer solution for a wide array of LIN-based body electronics and sensor applications, ensuring both performance and longevity in the harsh automotive environment.

Keywords: LIN Transceiver, Automotive Networking, Low Power Consumption, ESD Protection, Body Control Module