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UMTS/HSPA Module Series

UC20 Hardware Design

UC20_Hardware_Design Confidential / Released 47 / 82

1. It is recommended to reserved RC (R=22Ω, C=22pF) circuit on the PCM lines, especially for

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

Pin No.

Description

ADC0

General purpose analog to digital converter.

ADC1

General purpose analog to digital converter.

The following table describes the characteristic of the ADC function.

Table 16: Characteristic of the ADC

Parameter

Min.

Typ.

Max.

Unit

ADC0 Voltage Range

0.2

2.1

ADC1 Voltage Range

0.2

4.2

ADC Resolution

bits

Offset Error

3.5

Gain Error

2.5

NOTES

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