Specifications

M80 Hardware Design
M80_HD_V1.0 - 40 -
3.4.3. Restart
3.4.3.1. Restart module using the PWRKEY pin
Customer’s application can restart the module by driving the PWRKEY to a low level voltage for
certain time, which is similar to the way of turning on module. Before restarting the module, at
least 500ms should be delayed after detecting the low level of STATUS. The restart timing is
illustrated as the following figure.
STATUS
（OUTPUT）
H
PWRKEY
（INPUT）
Delay > 0.5s
Turn off
Pull down the PWRKEY
to turn on the module
Restart
Figure 12: Timing of restarting system
The module can also be restarted by the PWRKEY after emergency shutdown.
PWRKEY
（INPUT）
Pulldown > 20ms
Delay>2s
EMERG_OFF
（INPUT）
STATUS
（OUTPUT）
6us
Figure 13: Timing of restarting system after emergency shutdown
3.4.3.2. Restart module using AT command
Using an AT command “AT+QPOWD=2” can achieve restart of the module. Please refer to
document [1] for detail.
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