General description

The TJA1054A 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.

特性 Features

2.1 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

■ Good ElectroMagnetic Immunity (EMI) in normal operating mode and in low power modes

■ Fully integrated receiver filters

■ Transmit Data (TxD) dominant time-out function

2.2 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

2.3 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

2.4 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