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M12 Hardware Design

M12_HD_V3.3 - 28 -

Turn on pulse

PWRKEY

4.7K

47K

Figure 6: Turn on the module using driving circuit

The other way to control the PWRKEY is using a button directly. A TVS component is

indispensable to be placed nearby the button for ESD protection. When pressing the key,

electrostatic strike may generate from finger. A reference circuit is showed in Figure 7.

PWRKEY

Close to S1

TVS

Figure 7: Turn on the module using keystroke

The power on scenarios is illustrated as the following figure.

Quectel

Confidential

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Eddy Wireless SD Cards Series Specifiche Pagina 29