User Manual

Smart Machine Smart Decision
SIM7100_Hardware_Design_V1.02 2015-06-16
Table 8: Power on timing and Electronic Characteristic
Symbol Parameter Min. Typ. Max. Unit
T
on
The time of active low level impulse of PWRKEY
pin to power on module
100 500 - ms
T
on(status)
The time from power-on issue to STATUS pin
output high level(indicating power up ready )
15 - 25
s
T
on(uart)
The time from power-on issue to UART port ready 10 - 20 s
V
IH
Input high level voltage on PWRKEY pin 1.17 1.8 2.1 V
V
IL
Input low level voltage on PWRKEY pin -0.3 0 0.3 V
3.2.2 Power off
The following methods can be used to power off SIM7100.
● Method 1: Power off SIM7100 by pulling the PWRKEY pin down to ground.
● Method 2: Power off SIM7100 by AT command “AT+CPOF”.
● Method 3: over-voltage or under-voltage automatic power off. The voltage range can be set by
AT command “AT+CPMVT”.
● Method 4: over-temperature or under-temperature automatic power off.
Note: If the temperature is outside the range of -30~+80 ℃ , some warning will be reported via AT
port. If the temperature is outside the range of -40~+85 ℃ , SIM7100 will be powered off
automatically.
For details about “AT+CPOF” and “AT+CPMVT”, please refer to Document [1].
These procedures will make module disconnect from the network and allow the software to enter a
safe state, and save data before module be powered off completely.
The power off scenario by pulling down the PWRKEY pin is illustrated in the following figure.
Figure 13: Power off timing sequence