User's Manual

LTE Module
EC20 Hardware Design
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A reference circuit is shown in the following figure.
4.7K
47K
VBAT
2.2K
Module
Network
Indicator
Figure 25: Reference Circuit of the Network Indicator
3.15. Operating Status Indication
The STATUS pin is an open drain output for indicating the module operation status. You can connect it to
a GPIO of DTE with pulled up, or as LED indication circuit as 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 operation status
Require external pull-up
The following figure shows different design circuit of STATUS, you can choose either one according to
your application demands.
VDD_MCU
10K
Module
STATUS MCU_GPIO
Module
STATUS
VBAT
2.2K
Figure 26: Reference Circuit of the STATUS