NXP TJA1054汽车CAN收发方案

NXP 公司的TJA1054是控制器局部网（CAN）中的协议控制器和物理总线间的接口器件，提供差分接收和发送功能，波特速率高达125kBd,可连接高达32个节点，支持未屏蔽的总线连接，有非常低的电磁辐射（EME）和非常高的电磁干扰（EMI）免疫力，并集成了接收滤波器。本文介绍了TJA1054主要特性和优势，方框图，动态特性和瞬态性能测试电路，以及多种典型应用电路图。

TJA1054 Fault-tolerant CAN transceiver

The TJA1054 is the interface between the protocol controller and the physical bus wires in
a Controller Area Network (CAN). It is primarily intended for low-speed applications up to
125 kBd in passenger cars. The device provides differential receive and transmit capability but will switch to single-wire transmitter and/or receiver in error conditions.

The TJA1054T is pin and downwards compatible with the PCA82C252T and the TJA1053T. This means that these two devices can be replaced by the TJA1054T with retention of all functions.

The most important improvements of the TJA1054 with respect to the PCA82C252 and
TJA1053 are:

• Very low EME due to a very good matching of the CANL and CANH output signals

• Good EMI, especially in low power modes

• Full wake-up capability during bus failures

• Extended bus failure management including short-circuit of the CANH bus line to VCC..

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