CLM920_NC3_LTE Module hardware manual
Shanghai Yuge Information Technology co., LTD
- 30 -
Figure 3-8 Power-on reference circuit
3.4.3 Shut down
If the CLM920 NC3 module is to be shut down, the shutdown can be controlled by the
PWRKEY pin. At this time, the module performs a normal shutdown process. The module can
also be shut down by AT command, the shutdown command is AT$QCPWRDN.
3.4.4 Reset control
The CLM920 NC3 module PIN20 signal is the RESET reset pin. The application detects that
the module is abnormal. When the software does not respond, the module can be reset.
Pull the pin low for 100-450ms to reset the module. The RESET pin is sensitive to
interference and can be installed with a 10 nF to 0.1
μ
F capacitor near the signal for
signal filtering and away from RF interference signals when routing.
Table 3-7 Reset foot definition
Pin
Signal name
I/O
High value
Description
20
RESET
PI
1.8V
±
0.3V
Active low
Figure 3-9 Reset reference circuit