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FIBOCOM NL668-AM Hardware User Manual
Page 26 of 62
Pin name I/O Pin
Description
on mode, give it a Tst (2s
~
8s) low level, and then pull it high, the module
will power off
Table 3-6 Control Signal
3.3.1 Module power on
3.3.1.1 power on circuit reference
When the NL668-AM module is in power off mode, the module will power on by pulling down PWRKEY for
100ms
~
2s . It is recommended to use OC/OD drive circuit to control PWRKEY pin. The reference circuit
is shown in Figure 3-4:
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
（
recommended
：
ESD9X5VL-2/TR
)
near the button for ESD protection.
The reference circuit is shown in Figure 3-5.
Figure 3-5 Button Power on Reference Circuit
