![Quectel LTE-A Series Hardware Design Download Page 59](http://html.mh-extra.com/html/quectel/lte-a-series/lte-a-series_hardware-design_772113059.webp)
LTE-A Module Series
EG18 Hardware Design
EG18_Hardware_Design 58 / 104
In order to improve the accuracy of ADC, the trace of ADC should be surrounded by ground.
Table 19: Pin Definition of the ADC Interfaces
The following table describes characteristics of ADC interfaces.
Table 20: Characteristics of ADC Interfaces
1. The input voltage of ADC should not exceed 1.875V.
2. It is prohibited to supply any voltage to ADC pins when the power supply to VBAT is cut off.
3. It is recommended to use resistor divider circuit for ADC application.
3.14. Network Status Indication
The network indication pins can be used to drive network status indication LEDs. The following tables
describe pin definition and logic level changes in different network status.
Table 21: Pin Definition of Network Status/Activity Indicator
Pin Name
Pin No.
Description
ADC0
173
General purpose analog to digital converter interface.
If unused, keep it open.
ADC1
175
General purpose analog to digital converter interface
If unused, keep it open.
Parameter
Min.
Typ.
Max.
Unit
ADC0 Voltage Range
0
1.875
V
ADC1 Voltage Range
0
1.875
V
ADC Resolution
15
bits
Pin Name
Pin No.
I/O
Description
Comment
NET_MODE
147
DO
Indicate the module
’s network
registration mode.
1.8V power domain
If unused, keep it open.
NOTES