Eddy Wireless SD Cards Series Spécifications télécharger pdf (Page 33)

M12 Hardware Design

M12_HD_V3.3 - 32 -

button. The circuit is illustrated as the following figures.

Emergency

shutdown pulse

EMERG_OFF

4.7K

47K

Figure 10: Reference circuit for EMERG_OFF by using driving circuit

EMERG_OFF

Close to S1

TVS

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.

3.4.3. Restart module using PWRKEY pin

Customer’s application can restart the module by driving the PWRKEY to a low level voltage for

Quectel

Confidential

1 2 ... 28 29 30 31 32 33 34 35 36 37 38 ... 75 76

Pas de commentaire

Eddy Wireless SD Cards Series Spécifications Page 33