UMTS/HSPA Module Series
UC20 Hardware Design
UC20_Hardware_Design Confidential / Released 50 / 84
The following figure shows the reference design of PCM interface with external codec IC.
PCM_IN
PCM_OUT
PCM_SYNC
PCM_CLK
I2C_SCL
I2C_SDA
NAU8814
Module
1.8V
4.7K
4.7K
BCLK
MCLK
FS
DACIN
ADCOUT
SCLK
SDIN
BIAS
MIC_BIAS
MIC+
MIC-
SPKOUT+
SPKOUT-
Figure 30: Reference Circuit of PCM Application with Audio Codec
1. It is recommended to reserved RC (R=22Ω, C=22pF) circuit on the PCM lines, especially for
PCM_CLK.
2. UC20 work 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 17: Pin Definition of the ADC
General purpose analog to digital converter.
General purpose analog to digital converter.
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