Product Info

LTE Module Series
EG91 Hardware Design
EG91_Hardware_Design 53 / 93
Table 18: Pin Definition of STATUS
Pin Name Pin No. I/O Description Comment
STATUS 20 DO Indicate the module’soperatingstatus
1.8V power domain.
If unused, keep it open.
The following figure showsthe reference circuit of STATUS.
Figure 27: Reference Circuit of STATUS
3.16. ADC Interface
The module provides one analog-to-digital converter (ADC) interface. AT+QADC=0 command can
beused to read the voltage value on ADC0 pin. For more details about the command, please refer to
document [2].
In order to improve the accuracy of ADC voltage values, the traces of ADC should be surrounded by
ground.
Table 19: Pin Definition of ADC Interface
Pin Name Pin No. I/O Description Comment
ADC0 24 AI
Force the module to enter into
emergency download mode
If unused, keep this pin
open.
The following table describes the characteristics of ADC interface.