M12 Hardware Design
M12_Hardware_Design_V3.3 - 33 -
certain time, which is similar to the way to turn on module. Before restarting the module, at least
500ms should be delayed after detecting the low level of STATUS. The restart scenario is
illustrated as the following figure.
PWRKEY
(INPUT)
STATUS
(OUTPUT)
Delay >0.5s
Turn off
Restart
Pull down the PWRKEY
to turn on the module
Figure 12: Timing of restarting system
The module can also be restarted by the PWRKEY after emergency shutdown. The restart scenario
is illustrated as the following figure.
EMERG_OFF
(INPUT)
STATUS
(OUTPUT)
Delay >2s
6us
Pulldown >20ms
PWRKEY
(INPUT)
Figure 13: Timing of restarting system after emergency shutdown
3.5. Power saving
Upon system requirement, there are several actions to drive the module to enter low current
consumption status. For example, “AT+CFUN” can be used to set module into minimum
functionality mode and DTR hardware interface signal can be used to lead system to SLEEP
mode.
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