Adc Interfaces - Quectel SG865W Series Hardware Design

4.6. ADC Interfaces

The module provides 4 Analog-to-Digital Converter (ADC) interfaces. To improve the accuracy of ADC,
the trace of ADC interfaces should be surrounded by ground.
Table 19: Pin Definition of ADC Interface
Pin Name Pin No.
PM_ADC1 218
PM_ADC2 229
PM_ADC3 230
PM_ADC4 234
The accuracy of the ADC is up to 7 mV. The following table describes the characteristic of the ADC
interface.
Table 20: Characteristics of ADC Interface
Name
ADC1 Voltage Range
ADC2 Voltage Range
ADC3 Voltage Range
ADC4 Voltage Range
ADC Input Resistance
ADC1/ADC3/ADC4 Accuracy
(Voltage Range: 0–1.8 V)
ADC2 Accuracy (Voltage Range: 0–5.0 V)
ADC Sample Clock
NOTE
1. The input voltage of ADC should not exceed its corresponding voltage range.
2. It is prohibited to supply any voltage to ADC pin when VBAT is removed.
SG865W_Series_Hardware_Design
I/O Description
AI General-purpose ADC interface 1
AI General-purpose ADC interface 2
AI General-purpose ADC interface 3
AI General-purpose ADC interface 4
Min.
0
0
0
0
1
-12.5
-20
-
Smart Module Series
Comment
Typ. Max.
- 1.8
- 5.0
- 1.8
- 1.8
- -
± 7 12.5
± 10 20
4.8 -
Unit
V
V
V
V
MΩ
mV
mV
MHz
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