原标题：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

　　• Support for easy system fault diagnosis

　　• Two-edge sensitive wake-up input signal via pin WAKE

　　TJA1054主要特性和优势：

　　Optimized for in-car low-speed communication

　　Baud rate up to 125 kBd

　　Up to 32 nodes can be connected

　　Supports unshielded bus wires

　　Very low ElectroMagnetic Emission (EME) due to built-in slope control function and a

　　very good matching of the CANL and CANH bus outputs

　　Very high ElectroMagnetic Immunity (EMI) in normal and low power operating modes

　　Fully integrated receiver filters

　　Transmit Data (TxD) dominant time-out function

　　Bus failure management

　　Supports single-wire transmission modes with ground offset voltages up to 1.5 V

　　Automatic switching to single-wire mode in the event of bus failures, even when the CANH bus wire is short-circuited to VCC

　　Automatic reset to differential mode if bus failure is removed

　　Full wake-up capability during failure modes

　　Protections

　　Bus pins short-circuit safe to battery and to ground

　　Thermally protected

　　Bus lines protected against transients in an automotive environment

　　An unpowered node does not disturb the bus lines

　　Support for low power modes

　　Low current sleep mode and standby mode with wake-up via the bus lines

　　Power-on reset flag on the output

　　图1。TJA1054方框图

　　图2。TJA1054动态特性测试电路图

　　图3。TJA1054汽车瞬态性能测试电路图

　　图4。TJA1054应用框图

　　图5。TJA1054和TJA1053典型应用电路图

　　图6。TJA1054典型应用电路图