Users Manual Part 1

SIM8260A_Hardware Design_V1.05
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
If the temperature is outside the range of -30~+70°C, some warning will be reported via AT port.

If the temperature is outside the range of -40~+85°C, module will be powered off automatically.

For details about “AT+CPOF”, please refer to Document [1] in the appendix.
Normal power off action will make the module disconnect from the network, allow the software entered a
safe state, and save key data before the module is powered off completely.
The power off sequence is shown in the following figure.
Figure 13: Power off sequence
Table 15: Power off timing and electronic characteristic
Parameter
Description
Time value
Unit
Min.
Typ.
Max.
T
off
The time of holding on PWRKEY pin to a low level
2
-
-
s
T
off(usb)
The time from power-off issue to USB port off
-
3.5
-
s
T
off(status)
The time from power-off issue to STATUS off
-
2.1
-
s

After pressing the PWRKEY button, you must wait for 12S to disconnect the power supply or press
the PWRKEY again to turn on the module, otherwise it may damage the module or fail to turn on
module.

The timing of T
off(usb)
and T
off(status)
is related to the module software. The time here is based on the
standard version test and is for reference only.
NOTE
NOTE