UMTS/HSPA(+) Module Series
UC200T-EM Hardware Design
UC200T-EM_Hardware_Design 27 / 68
3.6.2.2. Turn off Module Using AT Command
It is also a safe way to use
AT+QPOWD
command to turn off the module, which is similar to turning off the
module via PWRKEY pin.
Please refer to
document [2]
for details about
AT+QPOWD
command.
1.
In order to avoid damaging internal flash, please do not switch off the power supply when the module
works normally. Only after the module is shut down by PWRKEY or AT command, the power supply
can be cut off.
2.
When turning off module with AT command, please keep PWRKEY at high level after the execution of
power-off command. Otherwise the module will be turned on again after successful turn-off.
3.7.
Reset the Module
The RESET_N pin can be used to reset the module. The module can be reset by driving RESET_N to a
low level voltage and then releasing it.
Table 8: RESET_N Pin Description
The recommended circuit is similar to the PWRKEY control circuit. An open drain/collector driver or button
can be used to control the RESET_N.
Reset pulse
RESET_N
4.7K
47K
Figure 8: Reference Circuit of RESET_N by Using Driving Circuit
Pin Name
Pin No.
I/O
Description
Comment
RESET_N
20
DI
Reset the module
1.8V power domain
NOTES
