AS8222 FlexRay Enhanced Basic Transceiver

The AS8222 is a high-speed fault tolerant device operating as interface between a generic FlexRay Communication Controller and the copper wiring. The AS8222 is designed to extend the application range for high speed and safety critical time triggered bus systems in an automotive environment. The bus driver is protected against short circuits to the supply. The AS8222 operates at baudrates up to 10 Mbps and is fully conforming to the FlexRay Electrical Physical Layer Specification V2.1 Rev B.

The AS8222 provides an host controller interface consisting of Enable (EN) and Standby (STBN) input pins for mode handling by the microcontroller and the Error (ERRN) output pin, signalling the failures or status information.

The device supports the NORMAL mode with activated FlexRay bus transmitter and receiver, the RECEIVE_ONLY mode with with activated receiver to avoid unwanted disturbances while listening to the communication and the low-power modes STANDBY and SLEEP with very low-power consumption.

In case of undervoltage at one of the supply voltages (VBAT, VCC, and VIO) the device will change its mode to a low-power mode (either STANDBY or SLEEP mode) and the device will signal an error accordingly. In case of low voltage is detected on both VBAT and VCC the device will enter the POWER-OFF mode.

Ensuring application in safety critical environments a two wire bus-guardian interface is implemented where additional monitoring circuitries on the electronic-control-unit can activate and deactivate (BGE) the transmitter and additionally on the receive enable output (RxEN) in low-power modes the wake conditions and in normal power modes the received FlexRay streams can be monitored.

A thermal sensor circuit with an integral shutdown mechanism prevents damage to the device in extreme temperature conditions.

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