General description

The TJA1080A is a FlexRay transceiver that is fully compliant with the FlexRay electrical

physical layer specification V2.1 Rev. A (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 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 TJA1080A can be configured to be used as an active star transceiver or as a node

transceiver.

The TJA1080A 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 TJA1080A actively monitors the system performance using dedicated error and

status information (readable by any microcontroller), as well as internal voltage and

temperature monitoring.

The TJA1080A supports the mode control as used in NXP Semiconductors TJA1054

(see Ref. 3) and TJA1041 (see Ref. 4) CAN transceivers.

The TJA1080A is the next step up from the TJA1080 FlexRay transceiver (Ref. 5). Being

fully pin compatible and offering the same excellent ESD protection, the TJA1080A also

features:

• Improved power-on reset concept

• Improved ElectroMagnetic Emission (EME)

• Support of 60 ns minimum bit time

• Improved bus error detection functionality

This makes the TJA1080A an excellent choice in any kind of FlexRay node.

See Section 14 for a detailed overview of differences between the TJA1080 and the

TJA1080A.

Features and benefits

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 EME to support unshielded cable

 Differential receiver with high common-mode range for 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)

 Independent power supply ramp-up for VBAT, VCC and VIO

 Transceiver can be used for linear passive bus topologies as well as active star

topologies

Low power management

 Low power management including two inhibit switches

 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

 Automatic power-down (in Star-sleep mode) in star configuration

Diagnosis (detection and signalling)

 Overtemperature detection

 Short-circuit on bus lines

 VBAT power-on flag (first battery connection and cold start)

 Pin TXEN and pin BGE clamping

 Undervoltage detection on pins VBAT, VCC and VIO

 Wake source indication

Protection

 Bus pins protected against 8 kV HBM ESD pulses

 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

 Fail-silent behavior in case of an undervoltage on pins VBAT, VCC or VIO

 Passive behavior of bus lines in the event that 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

 Active star - communication controller interface

 Active star - bus guardian interface

 Active star voltage regulator control