TJA1082

General description

The TJA1082 FlexRay node transceiver is compatible with the FlexRay electrical physical layer specification V2.1 Rev. B (see Ref. 1). It also incorporates features and parameters anticipated to be included in V3.0, currently being finalized. 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.

The TJA1082 provides a differential transmit capability to the network and a differential receive capability to the FlexRay controller. It offers excellent ElectroMagnetic Compatibility (EMC) performance as well as high ElectroStatic Discharge (ESD) protection.

The TJA1082 actively monitors system performance using dedicated error and status information (readable by any microcontroller), as well as internal voltage and temperature monitoring.

Features

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 V_IO
• Can be used in 14 V and 42 V powered systems
• Instant shut down interface (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 V_CC and V_IO
• 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 and HBM
• 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
• 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 V_IO or V_CC when the transceiver is not powered

FlexRay conformance classes

• Bus driver - bus guardian interface
• Bus driver logic level adaptation

Products/packages

Quality/reliability/chemical content

Quality and reliability disclaimer

Pricing/ordering/availability

Applications

Related applications
Body controller module

Design support

Support Documents

web; IBIS and HSPICE Model ()

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Disclaimers

• General product disclaimer
• Quality and reliability disclaimer