User's Manual

Smart Machine Smart Decision
SIM7100A_User Manual_V1.01 2014-12-11
30
NETLIGHT/GPIO1
(
Output
)
V
IL
<0.3V
Toff
PWRKEY
( Input
)
Tpd-
UART Port
UndefinedActive
USB Port
UndefinedActive
VDD_EXT
(
Output
)
Tpw-
Tuart
Tusb
V
IL
<0.3V
Ton
Trestart
Figure 11: Power off timing sequence
Table 10: Power off timing
Symbol Parameter
Time value
Min. Typ. Max. Unit
Toff The time pulling PWRKEY down to power off 0.5 - 5 s
TpD- The time to indicate disconnecting from the network - - 2 s
Tpw- The time to indicate the module power off completely - - 2 s
Tuart The time to disable UART - - 3 s
Tusb The time to disable USB - - 2 s
Trestart The time to power on again after Tpw- 0 - - s
User can also use the AT command
“AT+ CPO F” to power down the module. After that, the AT
commands cannot be executed any longer. The module enters the POWER DOWN mode.
VDD_EXT pin can be used to detect whether module is powered on or not. When module is powered
on and firmware goes ready, VDD_EXT will be high level.
Note: For details about “AT+CPOF”, please refer to Document [1].
3.2.3 Reset Function
SIM7100A also have a RESET pin (PIN4) to reset the module. This function is used as an emergency reset