AS8221
Data Sheet - Detailed Description
Figure 7. Signal for wake-up pattern recognition
Wake-up Symbol
Wake-up Symbol
VBUS
tBWU_Idle
tBWU_D0
tBWU_D0
tBWU_Idle
tBWU_Detect
8.7.2 Local Wake-Up Event
In all low-power modes, if the voltage on the WAKE pin falls below VLWUTH for longer than tLWFilter, a local wake-up event is detected. At the
same time the biasing of the pin is switched to pull-down. If the voltage on the WAKE pin rises above VLWUTH for longer than tLWFilter, a local
wake-up event is detected. At the same time the biasing of the pin is switched to pull-up. The pull up and down mechanism is active in low-power
and non-low-power modes.
Figure 8. WAKE input pin behavior
PULL-UP
PULL-DOWN
PULL-UP
WAKE
tLWUFilter
tLWUFilter
VBAT
RxD / RxEN
VIO
INH
VBAT
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