CLM920_AC3 Module Hardware Usage Guide
Shanghai Yuge Information Technology co., LTD
- 22 -
shutdown
When the module is working normally, do not shut down the power by turning off the
power, which may damage the module's Flash data. It is recommended to execute the
shutdown process through the PWRKEY and AT commands.
Figure 3-9 Shutdown timing diagram
3.4.4 Reset control
The CLM920 AC3 module PIN20 is a 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. A 10nF to 0.1uF
capacitor can be installed near the signal for signal filtering. Keep away from RF interference
signals when routing.
Table 3-8 Reset foot definition
Pin
Signal name
I/O
High value
Description
20
RESET_N
PI
1.8V
±
0.3V
Active low
