TJA1054T

GENERAL DESCRIPTION

The TJA1054 is the interface between the protocol controller and the physical wires of the bus lines in a Control Area Network (CAN). It is primarily intended for low-speed applications, up to 125 kBaud, in passenger cars. The device provides differential transmit capability but will switch in error conditions to single-wire transmitter and/or receiver.
The TJA1054T is pin and upwards 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 are:

• Very low RFI due to a very good matching of the CANL and CANH bus lines outputs
• Good immunity performance of EMC, especially in low power modes
• Fully wake-up capability during failure modes
• Extended bus failure management including short-circuit of the CANH bus line to VCC
• Supports easy fault localization
• Two-edge sensitive wake-up input signal via pin WAKE.

FEATURES

Optimized for in-car low-speed communication
• Baud rate up to 125 kBaud
• Up to 32 nodes can be connected
• Supports unshielded bus wires
• Very low Radio Frequency Interference (RFI) due to built-in slope control function and a very good matching of the CANL and CANH bus outputs
• Fully integrated receiver filters
• Permanent dominant monitoring of transmit data input
• Good immunity performance of ElectroMagnetic Compatibility (EMC) in normal operating mode and in low power modes.

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
• Fully wake-up capability during failure modes.

Protection

• Short-circuit proof to battery and ground in 12 V powered systems
• 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 and standby mode with wake-up via the bus lines
• Power-on reset flag on the output.