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AS8221

Data Sheet - C o n t e n t s

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....................................................................................................................................................... 7

6 Electrical Characteristics........................................................................................................................................................... 8

7 Typical Operating Characteristics........................................................................................................................................... 14

8 Detailed Description ................................................................................................................................................................. 15

8.1 Block Description.................................................................................................................................................................................... 15

8.2 Events..................................................................................................................................................................................................... 15

8.3 Operating Modes.................................................................................................................................................................................... 15

8.3.1 NORMAL Mode .......................................................................................................................................................................... 16

8.3.2 RECEIVE-ONLY Mode ............................................................................................................................................................... 16

8.3.3 STANDBY Mode......................................................................................................................................................................... 16

8.3.4 GO-TO-SLEEP Mode ................................................................................................................................................................. 16

8.3.5 SLEEP Mode .............................................................................................................................................................................. 16

8.4 Non Operating Mode .............................................................................................................................................................................. 16

8.4.1 POWER-OFF.............................................................................................................................................................................. 16

8.5 Undervoltage Events .............................................................................................................................................................................. 17

8.6 Power On/Off Events.............................................................................................................................................................................. 17

8.7 Wake-Up Events..................................................................................................................................................................................... 17

8.7.1 Remote Wake-Up Event............................................................................................................................................................. 17

8.7.2 Local Wake-Up Event ................................................................................................................................................................. 18

8.8 System Description................................................................................................................................................................................. 19

8.9 Fail Silent Behavior................................................................................................................................................................................. 20

8.9.1 RxEN / BGE timeout ................................................................................................................................................................... 20

8.9.2 State Transitions due to Under Voltage Detection...................................................................................................................... 20

8.9.3 State Transitions due to Voltage Recovery Detection ................................................................................................................ 20

8.10 Mode Transitions .................................................................................................................................................................................. 20

8.10.1 Operating Mode Transitions ..................................................................................................................................................... 21

8.10.2 ERRN Signalling ....................................................................................................................................................................... 23

8.11 Loss of ground ...................................................................................................................................................................................... 23

8.12 Error Flags Description......................................................................................................................................................................... 23

8.12.1 Undervoltage ............................................................................................................................................................................ 23

8.12.2 Bus Error (BUSERR) ................................................................................................................................................................ 23

8.12.3 BP Open Line (BP_OL) ............................................................................................................................................................ 23

8.12.4 BM Open Line (BM_OL) ........................................................................................................................................................... 23

8.12.6 BP Short Circuit to GND (BP_GND) ......................................................................................................................................... 24

8.12.8 BM Short Circuit to GND (BM_GND)........................................................................................................................................ 24