UMTS/HSPA Module Series
WCDMA UGxx Audio Design Note
WCDMA_UGxx_Audio_Design_Note Confidential / Released 8 / 56
2
PCM Characteristic
Quectel UGxx modules provide one PCM digital interface for audio design, which supports the following
features:
Supports16, 32 bit mode with short frame synchronization
,
the PCM supports 32 bit mode by default.
The default configuration of PCM codec is
AT+QDAC=1,0,0,2,0,0
.
Refer to
document [3]
for more
details.
Supports
master and slave
mode
.
Supports
audio
sample
rate
8
kHz
.
The following table shows the pin definition of PCM and I2C interface.
Table 1: Pin Definition
Table 2: IO Characteristics
Pin Name
I/O
Description
PCM_IN
DI
PCM data input
PCM_OUT
DO
PCM data output
PCM_SYNC
DO
PCM data frame sync signal
PCM_CLK
DO
PCM data bit clock
I2C_SCL
OD
I2C serial clock
I2C_SDA
OD
I2C serial data
Parameter
Description
Min.
Max.
Unit
V
IL
Low-level input voltage
-0.3
0.35
V
V
IH
High-level input voltage
1.3
1.85
V
V
OL
Low-level output voltage
0
0.25
V
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