M10 Hardware Design
M10_HD_V3.0 - 34 -
3.4.2.4. Emergency shutdown
The module can be shut down by driving the pin EMERG_OFF to a low level voltage for over 20ms
and then releasing it. The EMERG_OFF line can be driven by an Open Drain/Collector driver or a
button. The circuit is illustrated as the following figures.
Figure 10: Reference circuit for EMERG_OFF by using driving circuit
Figure 11: Reference circuit for EMERG_OFF by using button
Be cautious to use the pin EMERG_OFF. It should only be used under emergent situation. For
instance, if the module is unresponsive or abnormal, the pin EMERG_OFF could be used to
shutdown the system. Although turning off the module by EMERG_OFF is fully tested and nothing
wrong is detected, this operation is still a big risk as it could cause destroying of the code or data
area of the NOR flash memory in the module. Therefore, it is recommended that PWRKEY or AT
command should always be the preferential way to turn off the system.
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