User's Manual

GSM/GPRS/GNSS Module Series
MC60 Hardware Design
MC60_Hardware_Design Confidential / Released 44 / 99
3.5.2.4. Under-voltage Automatic Shutdown
The module will constantly monitor the voltage applied on the VBAT. If the voltage is ≤3.5V, the following
URC will be presented:
UNDER_VOLTAGE WARNING
The normal input voltage range is from 3.3V to 4.6V. If the voltage is <3.3V, the module will automatically
shut down.
If the voltage is <3.3V, the following URC will be presented:
UNDER_VOLTAGE POWER DOWN
After that moment, no further AT commands can be executed. The module logs off from network and
enters into power down mode.
When unsolicited result codes do not appear when autobauding is active and DTE & DCE are not
correctly synchronized after start-up, the module is recommended to be set to a fixed baud rate.
3.5.3. Restart
Restart is a process of module power down first and then power on. The module can be restarted by
driving the PWRKEY to a low level for a certain time, which is similar to the way of turning on the module
but differs in the time for PWRKEY driving. In order to make the internal LDOs discharge completely after
turning off the module, it is recommended to delay about 500ms before restarting the module.
3.6. Power on and down Scenarios in Stand-alone Solution
In stand-alone solution, GSM and GNSS parts are controlled separately, and thus the power on and down
control of them are independent from each other as well. The GSM part can be turned on/off or restarted
via PWRKEY pin control, which is the same as that in all-in-one solution. The GNSS part is turned on/off
via an external switch of MCU.
3.6.1. Power on GSM Part
The GSM part can be turned on by driving the pin PWRKEY to a low level voltage. An open collector
NOTE