Adc Interface - Quectel EG91 Series Hardware Design

Table 18: Pin Definition of STATUS
Pin Name Pin No.
STATUS 20
The following figure shows the reference circuit of STATUS.

3.16. ADC Interface

The module provides one analog-to-digital converter (ADC) interface. AT+QADC=0 command can be used
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's operating status
Module
STATUS
Figure 27: Reference Circuit of STATUS
I/O Description
Force the module to enter into
AI
emergency download mode
LTE Standard Module Series
VBAT
2.2K
4.7K
47K
EG91 Hardware Design
Comment
1.8V power domain.
If unused, keep it open.
Comment
If unused, keep this pin
open.
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