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FIBOCOM L610 Series Hardware Guide
Page 31 of 59
Pin Name I/O Pin
Description
when pulling down for power off, the minimum duration of low level is 3.1s
3.3.1 Module Power-on
3.3.1.1 Power-on Circuit Reference
When L610 module is in powered-off mode, the module will power on by pulling down PWRKEY for at
least 2s. It is recommended to use OC/OD drive circuit to control PWRKEY pin. The reference circuit is
shown in Figure 3-4:
4.7K
47K
10nF
PWRKEY
Turn on pulse
2s
Figure 3-4 OC/OD drive power-on reference circuit
Another method to control PWRKEY pin is to directly control through a button, and place a TVS
(ESD9X5VL-2/TR recommended) near the button for ESD protection. The reference circuit is shown in
Figure 3-5:
Figure 3-5 Button power-on reference circuit