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FIBOCOM NL668-LA Series Hardware Guide
Page 25 of 61
5 Functional Interface
5.1 Control Interface
Control interfaces used for module power on/off and reset operations. The pin definitions are as follows:
Table 5-1 Control signal
Pin name
I/O
Pin No.
Description
RESET_N
I
20
When the module in operating mode, pull down RESET_N
700ms to 1s, and then release it, the module is reset.
PWRKEY
I
21
When module in power off mode, pull down PWRKEY 100ms
to 2s, and release it, the module will power on; When module
in operating mode, pull down PWRKEY 3s to 8s, and then
release it, the module will power off.
5.1.1 Power On/Off
5.1.1.1 Power On
When NL668-LA series module in power off mode, pull down PWRKEY pin 100ms to 2s, the module will
power on, it is recommended to use OC/OD drive circuit to control PWRKEY pin. The OC drive reference
circuit is shown as follows:
Figure 5-1 OC drive power on reference circuit
The other way to control PWRKEY pin is use a button switch, a TVS should located near the button
(recommended ESD9X5VL-2/TR) for ESD protection. The button switch power on reference circuit is
shown as follows:
