AS8222-HSSP datasheet(2/43 Pages) AMSCO

2 / 43 page

AS8222

Enhanced FlexRay Standard Transceiver

www.ams.com/eng/FlexRay/AS8222

Revision 1.0

1 - 42

1 General Description

The AS8222 is a high-speed fault tolerant device operating as

interface between a generic FlexRay Communication Controller and

the copper wiring.

This device is the first FlexRay certified Transceiver for temperature

ranges up to 150°C ambient temperature. For bare-die deliveries

please contact ams for more information.

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 and GND. 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 a 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 failures

and status information.

The device supports the NORMAL mode with activated FlexRay bus

transmitter and receiver, the RECEIVE_ONLY mode with activated

receiver only 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 redundant

circuitries on the electronic-control-unit can monitor the

communication on the receive enable output (RxEN) and can

activate and deactivate through the bus guardian enable input (BGE)

the transmitter. Additionally in low-power modes the wake conditions

at the RxEN pin can be monitored.

A thermal sensor circuit with an integral shutdown mechanism

prevents damage to the device in extreme temperature conditions.

2 Key Features



Data transfer up to 10 Mbps



Compliant with FlexRay Electrical Physical Layer Specification

V2.1 Rev. B



Wide operating ambient temperature range -40°C to +150°C



Excellent EMC performance



High common mode range insures excellent EMI immunity



Interface with optional bus guardian for bus supervision



Automatic thermal shutdown protection



Supports 12, 24V systems with low sleep current consumption



Integrated power management system



Two INH pins for the external voltage regulators control



Local wake-up input



Remote wake-up capability via FlexRay bus in sleep mode



Supports 2.5, 3, 3.3, 5 V microcontrollers and automatically

adapts to interface levels



Does not disturb the bus line if not powered



Protected against damage due to short circuit conditions on the

bus (positive and negative battery voltage)



Small Pb-free package: SSOP-20



Automotive qualified to AEC-Q100, grade 0



For bare-die deliveries please contact us.

3 Applications

The AS8222 FlexRay Standard Transceiver is best fitting for

automotive FlexRay nodes where bus wake-up and voltage regulator

control for voltage supplies is needed.

The device addresses all ECUs connected to the permanent battery

supply (terminal 30).

The device is best suited for high temperature applications with up to

150°C.

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