General description

The TJA1080 is a FlexRay transceiver, which is in line with the FlexRay electrical physical layer specification V2.1 Rev. A (see Ref. 1). It is primarily intended for communication systems from 1 Mbit/s to 10 Mbit/s, and provides an advanced interface between the protocol controller and the physical bus in a FlexRay network.

The TJA1080 can be configured to be used as an active star transceiver or as a node transceiver.

Features

2.1 Optimized for time triggered communication systems

■ Data transfer up to 10 Mbit/s

■ Usable for 14 V and 42 V powered systems

■ Very low ElectroMagnetic Emission (EME) to support unshielded cable

■ Differential receiver with high common-mode range for ElectroMagnetic Immunity (EMI)

■ Transceiver can be used for linear passive bus topologies as well as active star topologies

■ Auto I/O level adaptation to host controller supply voltage VIO

■ Bus guardian interface included

■ Automotive product qualification in accordance with AEC-Q100

2.2 Low power management

■ Low power management including two inhibit switches

■ Very low current in Sleep and Standby mode

■ Wake-up via wake-up symbol on the bus lines (remote), negative edge on pin WAKE (local), and a positive edge on pin STBN if VIO is present

■ Wake-up source recognition

■ Automatic power-down (in Star-sleep mode) in star configuration

2.3 Diagnosis (detection and signalling)

■ Overtemperature detection

■ Short-circuit on bus lines

■ VBAT power-on flag (first battery connection and cold start)

■ Pin TXEN and pin BGE clamping

■ Undervoltage detection on pins VBAT, VCC and VIO

■ Wake source indication

2.4 Protections

■ Bus pins protected against 8 kV HBM ESD pulses

■ Bus pins protected against transients in automotive environment (ISO 7637 class C compliant)

■ Bus pins short-circuit proof to battery voltage (14 V and 42 V) and ground

■ Fail-safe mode in case of an undervoltage on pins VBAT, VCC or VIO

■ Passive behavior of bus lines in the event that transceiver is not powered