Adc Interface - Quectel EG91 Series Hardware Design

Table 18: Pin Definition of STATUS
Pin Name Pin No.
STATUS 20
The following figure showsthe reference circuit of STATUS.
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.
ADC0 24
The following table describes the characteristics of ADC interface.
EG91_Hardware_Design
I/O Description
DO Indicate the module'soperatingstatus
Figure 27: Reference Circuit of STATUS

3.16. ADC Interface

I/O Description
Force the module to enter into
AI
emergency download mode
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LTE Module Series
EG91 Hardware Design
Comment
1.8V power domain.
If unused, keep it open.
Comment
If unused, keep this pin
open.