Sim2 M80 Dokumentacja Pobierz pdf (Strona 36)

M80 Hardware Design

M80_HD_V1.0 - 36 -

VDD_EXT

（OUTPUT）

<0.1*VBAT

> 0.6*VBAT

VBAT

PWRKEY

(INPUT)

EMERG_OFF

（INPUT）

54ms

250ms

STATUS

（OUTPUT）

800ms

>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”

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Sim2 M80 Dokumentacja Strona 36