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Hardware Integration Guide
VBATT
VCC_1V8
ON/OFF
Power ON
Transition
Figure 11.
Alternate ON/OFF Control
Table 37.
Power-ON Sequence Symbol Definitions
Symbol
Parameter
t
Turn ON Pulse duration
ON
t
Turn OFF Pulse duration
OFF
t
Time to Power OFF
pwroff
Time VBATT must be maintained after VCC_1V8
t
pwrrmv
goes inactive
Time required for ON/OFF to be high prior to OFF
t
HI
pulse.
T
is the time between when a power OFF pulse is complete and when shutdown is completed by
pwroff
the AirPrime AR7558 devices. This duration is network and device dependent, i.e. in a CDMA network
a power down registration is initiated by the AirPrime AR7558 device, when the acknowledgement is
received from the network power OFF completes.
Detection of power down can be accomplished by monitoring for one of the following:
+WIND: 10 output on the AT Command interface
USB ports are de-enumerated
The application must wait for a power down to be detected prior to removing power from the AirPrime
AR7558 device. If a timeout is required, it is recommended to be in excess of 30s prior to removing
power from the AirPrime AR7558 device.
Note:
Refer to document [7] for details on enabling the +WIND message for power down and
+USLGRPMSK and +USLEVTMSK for unsolicited message output.
4116922
Power OFF
Boot
In process
Complete
Rev 1.1
Baseband Specification
t
pwroff
t
t
HI
OFF
Pulse
Min
Typ
50 ms
100 ms
50 ms
100 ms
-
5 s
0 s
-
10 s
-
50 ms
January 21, 2015
t
pwrrmv
Max
∞
500 ms
-
-
33
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