AS8221
Data Sheet - Detailed Description
Table 7. Transition Table
Transition
Under Voltage Flag
Host Input
STBN
Wake
Flag
Event
Remarks
Start Point
Destination
VIO
VBAT
VCC
L
EN
NORMAL
S
S
U
S
U
U
L
L
L
X
(1) L→H
H
L
L
X
L
L
L
L
L
(1) H→L
STANDBY
L
L
(1) L→H
(2) X→L
L
H
H
H
H
t≥tSLEEP
L
(1) L→H
L
L
L
L
L
L
GO-TO-SLEEP
SLEEP
(2) X→L
(2) X→L
(1) L→H
sleep timer
disabled
GO-TO-SLEEP
W
L
L
L
L
L
(1) L→H
L
H
S
W
U
U
S
L
L
(1) L→H
H
H
H
H
L
(2) X→L (2) X→L
(2) X→L
(1) L→H
H
NORMAL
RECEIVE-ONLY
STANDBY
L
(1) H→L
L
(1) H→L
L
L
H
L
L
L
L
H
L
L
(1) L→H
W
U
U
W
U
U
U
(2) X→L (2) X→L
(2) X→L
(1) L→H
H
H
H
L
H
L
L
(1) H→L
L
L
(1) H→L
L
L
L
L
(2) X→L (2) X→L
(2) X→L
(1) L→H
L
L
(1) H→L
L
L
L
L
L
L
L
(1) H→L
(1) H→L
L
L
L
L
H
X
X
SLEEP
sleep timer
disabled
W
U
(2) X→L (2) X→L
(2) X→L
(1) L→H
L
L
L
H
H
H
sleep timer
disabled
GO-TO-SLEEP
L
(1) H→L
L
L
L
L
sleep timer
disabled
U
(1) H→L
L
S
S
S
S
U
U
U
X
X
X
L
L
L
L
L
L
L
X
(1) L↔H
H
L
X
(1) L↔H
X
X
X
X
X
X
L
H
L
(1) L↔H
SLEEP
H
H
L
(1) L↔H
X
(1) L→H
L
(1) L→H
L
X
X
X
X
X
L
(1) L↔H
Note: S = transition forced via EN, STBN; U = transition forced via undervoltage or voltage recovery; W = transition forced via WAKE
(1) Indicates the action, that initiates the transition
(2) Indicates the consequence after performed transition
(3) In case the wake flag is set, it is not possible to enter SLEEP mode through a Sleep command, requested by the host.
(4) In case an undervoltage on VBAT and VCC is detected, the device enters the POWER-OFF state.
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