Functional Interface; Control Interface; Power On/Off; Power On - Fibocom NL668-LA Series Hardware Manual

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
RESET_N I
PWRKEY I

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:
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:
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FIBOCOM NL668-LA Series Hardware Guide
Pin No. Description
When the module in operating mode, pull down RESET_N
20
700ms to 1s, and then release it, the module is reset.
When module in power off mode, pull down PWRKEY 100ms
to 2s, and release it, the module will power on; When module
21
in operating mode, pull down PWRKEY 3s to 8s, and then
release it, the module will power off.
Figure 5-1 OC drive power on reference circuit
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