CLM920 TD3 LTE Module Hardware Usage Guide
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Table 3-15 Network indicator pin definition
Pin
Signal name
I/O
Description
6
NET_STATUS
OD
Network status indication
Table 3-16 Network indication status
status
LED display status
No service
Constantly bright
Module registration on non-4G network
Slow flash
The module registers 4G network or module to register
non-4G network for voice SMS and other services.
Flashing
LED network indicator reference design is as follows
：
Figure 3-18 Network indicator circuit diagram
The brightness of the network indicator can be adjusted by adjusting the current limiting
resistor R. The current can be adjusted up to 40mA.
3.10 Module status indication
The CLM920 TD3 module provides a pin as a working status indicator of the module.
This pin can be used to connect to a GPIO or LED with pull-up. It is used to indicate the
power-on status of the module. The drive current should be less than 0.8mA. , STATUS pin
will output low level, and the rest will be high impedance state.
Table 3-17 Module Status Pin Definitions
Pin
Signal name
I/O
Description
Remarks
61
STATUS
DO
Module power on status indication
External pull-up
