AS8221
Data Sheet - 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....................................................................................................................................................... 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
8.5.1 Undervoltage/Voltage Recovery VBAT ........................................................................................................................................ 17
8.5.2 Undervoltage/Voltage Recovery VIO........................................................................................................................................... 17
8.5.3 Undervoltage/Voltage Recovery VCC.......................................................................................................................................... 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
8.12.5 BP Short Circuit to VCC (BP_VCC) ............................................................................................................................................ 24
8.12.6 BP Short Circuit to GND (BP_GND)......................................................................................................................................... 24
8.12.7 BM Short Circuit to VCC (BM_VCC)........................................................................................................................................... 24
8.12.8 BM Short Circuit to GND (BM_GND)........................................................................................................................................ 24
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