M10 Hardware DesignIt can caused the module logoff from the network and allow the software to enter into a securestate and save data before completely disconnect the power supply.Before the completion of the switching off procedure the module will send out result code:NORMAL POWER DOWNAfter this moment, the AT commands can’t be executed. The module enters the POWER DOWNmode, only the RTC is still active. POWER DOWN can also be indicated by VDD_EXT pin,which is a low level voltage in this mode.PWRKEY（INPUT）VDD_EXT（OUTPUT）V IL<0.3*VBATV IH >0.7*VBAT1s > Pulldown > 0.6sHizLogout net about 2s to 8sFigure 8: Timing of turn off system3.4.2.2 Turn off module using AT commandYou can use an AT command “AT+QPOWD=1” to turn off the module. This command will letthe module to log off from the network and allow the software to enter into a secure state and savedata before completely disconnecting the power supply.Before the completion of the switching off procedure the module will send out result code:NORMAL POWER DOWNAfter this moment, the AT commands can’t be executed. The module enters the POWER DOWNmode, only the RTC is still active. POWER DOWN can also be indicated by VDD_EXT pin,which is a low level voltage in this mode.Please refer to document [1] for detail about the AT command of “AT+QPOWD”.3.4.2.3 Over-voltage or under-voltage automatic shutdownThe module will constantly monitor the voltage applied on the VBAT, if the voltage ≤ 3.5V, theM10_HD_V1.00 - 27 -Quectel
