Adc Function; Uc20_Hardware_Design; Confidential / Released - Quectel UC20 Hardware Design

NOTES
It is recommended to reserved RC (R=22Ω, C=22pF) circuit on the PCM lines, especially for
1.
PCM_CLK.
2. UC20 works as a master device pertaining to I2C interface.

3.14. ADC Function

The module provides two analog-to-digital converters (ADC) to digitize the analog signal to 15-bit digital
data such as battery voltage, temperature and so on. Using AT command AT+QADC=0 can read the
voltage value on ADC0 pin. Using AT command AT+QADC=1 can read the voltage value on ADC1 pin.
For more details of these AT commands, please refer to document [1].
In order to improve the accuracy of ADC, the trace of ADC should be surrounded by ground.
Table 15: Pin Definition of the ADC
Pin Name
ADC0
ADC1
The following table describes the characteristic of the ADC function.
Table 16: Characteristic of the ADC
Parameter
ADC0 Voltage Range
ADC1 Voltage Range
ADC Resolution
Offset Error
Gain Error

UC20_Hardware_Design

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Pin No. Description
45 General purpose analog to digital converter.
44 General purpose analog to digital converter.
Min.
0.2
0.2
Typ. Max.
2.1
4.2
15
3.5
2.5

Confidential / Released

UMTS/HSPA Module Series
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