General description
The TJA1082 FlexRay node transceiver is compliant with the FlexRay electrical physical layer specification V2.1 Rev. B (see Ref. 1). In addition, it incorporates features and parameters included in V3.0.1 (see Ref. 2 and Section 14). It is primarily intended for communication systems operating at between 2.5 Mbit/s and 10 Mbit/s, and provides an advanced interface between the protocol controller and the physical bus in a FlexRay network. The TJA1082 offers an optimized solution for Electronic Control Unit (ECU) applications that do not need enhanced power management and are typically switched by the ignition or activated by a dedicated wake-up line.

FEATUREs and benefits
Optimized for time triggered communication systems
■ Compliant with Electrical Physical Layer specification 2.1 Rev. B
■ Automotive product qualification in accordance with AEC-Q100 (Grade 1)
■ Data transfer at 2.5 Mbit/s, 5 Mbit/s and 10 Mbit/s
■ Supports 60 ns minimum bit time at 400 mV differential voltage
■ Very low ElectroMagnetic Emission (EME) to support unshielded cable
■ Differential receiver with high common-mode range for excellent ElectroMagnetic Immunity (EMI)
■ Auto I/O level adaptation to host controller supply voltage VIO
■ Can be used in 14 V and 42 V powered systems
■ Instant shut-down interface (via BGE pin)

Low power management
■ Very low current consumption in Standby mode
■ Remote wake-up via a wake-up pattern or dedicated FlexRay data frames on the bus lines

Diagnosis and robustness
■ Enhanced supply voltage monitoring for VCC and VIO
■ Two error diagnosis modes:
   ◆ Status register readout via the Serial Peripheral Interface (SPI)
   ◆ Simple error indication via pin ERRN
■ Overtemperature detection
■ Short-circuit detection on bus lines
■ Power-on flag
■ Clamping diagnosis for pins TXEN and BGE
■ Bus pins protected against 8 kV ESD pulses (according to IEC61000-4-2 and HBM)
■ Bus pins protected against transients in automotive environment (according to ISO 7637 class C)
■ Bus pins short-circuit proof to battery voltage (14 V and 42 V) and ground
■ Maximum differential voltage between pins BP or BM and any other pin of 60 V
■ Bus lines remain passive when the transceiver is not powered
■ No reverse currents from the digital input pins to VIO or VCC when the transceiver is not powered

FlexRay conformance classes
■ Bus driver - bus guardian interface
■ Bus driver logic level adaptation