Specifications

M80 Hardware Design
M80_HD_V1.0 - 36 -
VDD_EXT
（OUTPUT）
V
IL
<0.1*VBAT
V
IH
> 0.6*VBAT
VBAT
PWRKEY
(INPUT)
EMERG_OFF
（INPUT）
54ms
250ms
STATUS
（OUTPUT）
800ms
1
>1s
Figure 8: Timing of turning on system
① Make sure that VBAT is stable before pulling down PWRKEY pin. The time between them
is recommended 30ms.
Note: Customer can monitor the voltage level of the STATUS pin to judge whether the module
is power-on. After the STATUS pin goes to high level, PWRKEY may be released. If the
STATUS pin is ignored, pull the PWRKEY pin to low level for more than 1 second to turn on
the module.
3.4.2. Power down
The following procedures can be used to turn off the module:
 Normal power down procedure: Turn off module using the PWRKEY pin
 Normal power down procedure: Turn off module using command “AT+QPOWD”
 Over-voltage or under-voltage automatic shutdown: Take effect when over-voltage or
under-voltage is detected
 Emergent power down procedure: Turn off module using the EMERG_OFF pin
 Emergent power down procedure: Turn off module using command “AT+QPOWD”
Quectel
Confidential