User's Manual

Smart Machine Smart Decision
SIM7100A_User Manual_V1.01 2014-12-11
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Table 9: Power on timing
Symbol Parameter
Time value
Unit
Min. Typ. Max.
Ton The time to pull PWRKEY down to power on 180 500 - ms
TpD+ The time to indicate connecting with the network - - 5 s
Tpw+
The time to indicate the module is powered on
completely
-
- 0.5
s
Tuart The time to enable UART - - 8 s
Tusb The time to enable USB - - 10 s
Note: Module could be automatically power on by connecting PWRKEY pin to Low level directly.
Before designing, please refer to Document [27] for more detail.
3.2.2 Power off Sequence
The following methods can be used to power down SIM7100A. These procedures will make module
disconnect from the network and allow the software to enter a safe state, and then save data before
completely powering the module off.
● Method 1: Power off SIM7100A by pulling the PWRKEY pin down
● Method 2: Power off SIM7100A by AT command
User can power off the SIM7100A by pulling PWRKEY down for a specific time. The power off scenario
is illustrated in the following figure.