基于TJA1054設(shè)計的汽車CAN收發(fā)技術(shù)
加入技術(shù)交流群
TJA1054是控制器局部網(wǎng)（CAN）中的協(xié)議控制器和物理總線間的接口器件，提供差分接收和發(fā)送功能，波特速率高達(dá)125kBd,可連接高達(dá)32個節(jié)點，支持未屏蔽的總線連接，有非常低的電磁輻射（EME）和非常高的電磁干擾（EMI）免疫力，并集成了接收濾波器。
TJA1054主要特性和優(yōu)勢：
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
圖1。TJA1054方框圖
圖2。TJA1054動態(tài)特性測試電路圖
評論