TJA1081B
FlexRay node transceiver
Rev. 1 — 4 June 2012
Product data sheet
1. General description
The TJA1081B is a FlexRay node transceiver that is fully compliant with the FlexRay
electrical physical layer specification V3.0.1 (see Ref. 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 (see Ref. 3) and is fully
function and footprint compatible with the TJA1081 (see Ref. 2).
2. Features and benefits
2.1 Optimized for time triggered communication systems
Compliant with FlexRay electrical physical layer specification V3.0.1 (see Ref. 1)
Meets JASPAR requirementsasdescribedinthe ‘Busdriverincreasedvoltage
amplitudetransmitter’functionalclass
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 VIO
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 VBAT, VCC and VIO