TJA1081B Flexray Node Transceiver

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TJA1081G is the recommended part for new designs as the TJA1081B does NOT have production continuity guaranteed by the NXP longevity program.

The TJA1081B is a FlexRay node transceiver that is fully compliant with the FlexRay electrical physical layer specification V3.0.1. In order to meet the JASPAR-specific requirements, it implements the ‘Bus driver increased voltage amplitude transmitter’ functional class. It is primarily intended for communication systems from 2.5 Mbit/s to 10 Mbit/s and provides an advanced interface between the protocol controller and the physical bus in a FlexRay network.

The TJA1081B features enhanced low-power modes, optimized for ECUs that are permanently connected to the battery.

The TJA1081B provides differential transmit capability to the network and differential receive capability to the FlexRay controller. It offers excellent EMC performance as well as effective ESD protection.

The TJA1081B 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 TJA1081B supports mode control as used in the TJA1080A and is fully function and footprint compatible with the TJA1081.

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Data Sheet

Product Details

Block Diagram

TJA1081B Block Diagram

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Features

Optimized for Time Triggered Communication Systems

Compliant with FlexRay electrical physical layer specification V3.0.1
Meets JASPAR requirements as described in the ‘Bus driver increased voltage amplitude transmitter’ functional class
Automotive product qualification in accordance with AEC-Q100
Data transfer rates from 2.5 Mbit/s to 10 Mbit/s
Supports 60 ns minimum bit time at 400 mV differential input voltage
Very low ElectroMagnetic Emissions (EME) to support unshielded cable, meeting latest industry standards
Differential receiver with wide common-mode range for high ElectroMagnetic Immunity (EMI), meeting latest industry standards
Auto I/O level adaptation to host controller supply voltage V_IO
Can be used in 14 V, 24 V and 48 V powered systems
Instant transmitter shut-down interface (via BGE pin)
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
V_BAT operating range: 4.75 V to 60 V
Gap-free specification
Local and remote wake-up
Supports remote wake-up via dedicated data frames
Wake-up source recognition

Diagnosis (Detection and Signaling)

Enhanced supply monitoring of V_BAT, V_CC and V_IO
Overtemperature detection
Short-circuit detection on bus lines
V_BAT power-on flag (first battery connection and cold start)
Clamping diagnosis on pin TXEN
BGE status feedback

Protection

Bus pins protected against ±6 kV ESD pulses according to IEC61000-4-2 and HBM
Pins V_BAT and WAKE protected against ±6 kV ESD pulses according to IEC61000-4-2
Bus pins protected against transients in automotive environment (according to ISO 7637 class C)
Bus pins short-circuit proof to battery voltage (14 V, 24 V and 48 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
No reverse currents from the digital input pins to V_IO or V_CC when the transceiver is not powered

Functional Classes According to FlexRay Electrical Physical Layer Specification

Bus driver voltage regulator control
Bus driver - bus guardian interface
Bus driver logic level adaptation
Bus driver remote wake-up
Bus driver increased voltage amplitude transmitter (JASPAR)

Buy/Parametrics

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