User's Manual

LTE Module Series
EC21 Hardware Design
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Figure 25: Reference Circuit of the Network Indicator
3.15. STATUS
The STATUS pin is an open drain output for indicating the module’s operation status. You can connect it
to a GPIO of DTE with a pull up resistor, or as the LED indication circuit shown below. When the module is
turned on normally, the STATUS will present the low state. Otherwise, the STATUS will present
high-impedance state.
Table 19: Pin Definition of STATUS
Pin Name Pin No. I/O Description Comment
STATUS 61 OD Indicate the module’s operation status Require external pull-up
The following figure shows different circuit designs of STATUS, and you can choose either one according
to your application demands.
Figure 26: Reference Circuits of STATUS