TJA1081

General description

The TJA1081 is a FlexRay node transceiver that is fully compliant with the FlexRay electrical physical layer specification V2.1 Rev. A (see Ref. 1) and partly complies with versions V2.1 Rev. B. In addition, the TJA1081 already incorporates features and parameters anticipated to be included in V3.0, currently being finalized. 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 TJA1081 features enhanced low-power modes, optimized for ECUs that are permanently connected to the battery.

The TJA1081 provides differential transmit capability to the network and differential receive capability to the FlexRay controller. It offers excellent EMC performance as well as high ESD protection.

The TJA1081 actively monitors system performance using dedicated error and status information (that can be read by any microcontroller), along with internal voltage and temperature monitoring.

The TJA1081 supports mode control as used in the TJA1080A (see Ref. 2).

Features

Optimized for time triggered communication systems

• Compliant with FlexRay electrical physical layer specification V2.1 Rev. A (see Ref. 1)
• Automotive product qualification in accordance with AEC-Q100
• Data transfer up to 10 Mbit/s
• Support of 60 ns minimum bit time
• Very low ElectroMagnetic Emission (EME) to support unshielded cable
• Differential receiver with wide common-mode range for high 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
• Bus guardian interface
• Independent power supply ramp-up for V_BAT, V_CC and V_IO

Low power management

• Low power management including inhibit switch
• Very low current in Sleep and Standby modes
• Local and remote wake-up
• Supports remote wake-up via dedicated data frames
• Wake-up source recognition

Diagnosis (detection and signalling)

• Overtemperature detection
• Short-circuit on bus lines
• V_BAT power-on flag (first battery connection and cold start)
• Pin TXEN and pin BGE clamping
• Undervoltage detection on pins V_BAT, V_CC and V_IO
• Wake source indication

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-silent behavior in the event of an undervoltage on pins V_BAT, V_CC or V_IO
• Passive behavior of bus lines while the transceiver is not powered

Functional classes according to FlexRay electrical physical layer specification (see Ref. 1)

• Bus driver voltage regulator control
• Bus driver - bus guardian control 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