Users Manual

GSM/GPRS Module Series
M66 Hardware Design
M66_Hardware_Design Confidential / Released 28 / 82
placed nearby the button. When pressing the key, electrostatic strike may generate from finger. A
reference circuit is shown in the following figure.
Figure 7: Turn on the Module with a Button
The turn-on timing is illustrated as the following figure.
Figure 8: Turn-on Timing
Make sure that VBAT is stable before pulling down PWRKEY pin. The time of T
1
is recommended to be
100ms.
NOTE