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5 Functional interface
5.1 Control interface
Control interfaces used for module power on/off and reset operations. The pin definitions are as follows:
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~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 User Manual
Pin Num
Description
When the module in operating mode, pull down RESET_N
20
700ms~1s, and then release it, the module is reset
When module in power off mode, pull down PWRKEY
100ms~2s, and release it, the module will power on; When
21
module in operating mode, pull down PWRKEY 3s~8s, and
then release it, the module will power off
Table 5- 1 Control Signal
Figure 5- 1 OC Drive Power on Reference Circuit
Page 28 of 65
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