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AS8221

FlexRay Standard Transceiver

austriamicrosystems AG 

AS8221

Datasheet - Contents

Contents

1 General Description .................................................................................................................................................................. 1

2 Key Features............................................................................................................................................................................. 1

3 Applications............................................................................................................................................................................... 1

4 Pin Assignments ....................................................................................................................................................................... 5

4.1 Pin Descriptions.................................................................................................................................................................................... 5

5 Absolute Maximum Ratings ...................................................................................................................................................... 6

6 Electrical Characteristics........................................................................................................................................................... 7

7 Typical Operating Characteristics ........................................................................................................................................... 13

8 Detailed Description................................................................................................................................................................ 14

8.1 Block Description................................................................................................................................................................................ 14

8.2 Events................................................................................................................................................................................................. 14

8.3 Operating Modes ................................................................................................................................................................................ 14

8.3.1 NORMAL Mode ......................................................................................................................................................................... 15

8.3.2 RECEIVE-ONLY Mode .............................................................................................................................................................. 15

8.3.3 STANDBY Mode........................................................................................................................................................................ 15

8.3.4 GO-TO-SLEEP Mode ................................................................................................................................................................ 15

8.3.5 SLEEP Mode ............................................................................................................................................................................. 15

8.4 Non Operating Mode .......................................................................................................................................................................... 15

8.4.1 POWER-OFF............................................................................................................................................................................. 15

8.5 Undervoltage Events .......................................................................................................................................................................... 16

8.5.1 Undervoltage/Voltage Recovery VBAT ...................................................................................................................................... 16

8.5.2 Undervoltage/Voltage Recovery VIO ......................................................................................................................................... 16

8.5.3 Undervoltage/Voltage Recovery VCC........................................................................................................................................ 16

8.6 Power On/Off Events.......................................................................................................................................................................... 16

8.7 Wake-Up Events................................................................................................................................................................................. 16

8.7.1 Remote Wake-Up Event ............................................................................................................................................................ 16

8.7.2 Local Wake-Up Event ................................................................................................................................................................ 17

9 Application Information ........................................................................................................................................................... 18

9.1 Fail Silent Behavior............................................................................................................................................................................. 19

9.1.1 RxEN / BGE timeout .................................................................................................................................................................. 19

9.1.2 State Transitions due to Undervoltage Detection ...................................................................................................................... 19

9.1.3 State Transitions due to Voltage Recovery Detection ............................................................................................................... 19

9.2 Mode Transitions ................................................................................................................................................................................ 19

9.2.1 Operating Mode Transitions ...................................................................................................................................................... 20

9.2.2 ERRN Signalling ........................................................................................................................................................................ 22

9.3 Loss of Ground ................................................................................................................................................................................... 22

9.4 Error Flags.......................................................................................................................................................................................... 22

9.4.1 Undervoltage ............................................................................................................................................................................. 22

9.4.2 Bus Error (BUSERR) ................................................................................................................................................................. 22

9.4.3 Short Circuit between BP and BM (BP_BM).............................................................................................................................. 22

9.4.4 Over Temperature (OT) ............................................................................................................................................................. 22

9.4.5 TxEN_BGE Timeout (TxEN_TO)............................................................................................................................................... 22

9.4.6 Error Flag (ERROR) .................................................................................................................................................................. 23

9.5 Status Flags........................................................................................................................................................................................ 23

9.5.1 Local Wake Flag (LWAKE) ........................................................................................................................................................ 23

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