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PCM_CLK
PCM_SYNC
PCM_DOUT
PCM_DIN
Clock and mode can be configured by AT command, and the default configuration is master mode using
short frame synchronization format with 2048kHz PCM_CLK and 8kHz PCM_SYNC. In addition, EG21-G
Mini PCIe's firmware has integrated the configuration on some PCM codec's application with I2C interface.
Please refer to document [2] for details about AT+QDAI command.
The following figure shows a reference design of PCM and I2C interfaces with an external codec IC.
PCM_CLK
PCM_SYNC
PCM_DOUT
PCM_DIN
I2C_SCL
I2C_SDA
Module
Figure 10: Reference Circuit of PCM and I2C Application with Audio Codec
EG21-G_Mini_PCIe_Hardware_Design
1
2
MSB
MSB
Figure 9: Timing in Auxiliary Mode
1.8V
LTE Standard Module Series
EG21-G Mini PCIe Hardware Design
125us
31
32
LSB
LSB
MIC_BIAS
BCLK
FS
MIC+
MIC-
DACIN
ADCOUT
SPKOUT+
SCLK
SDIN
SPKOUT-
Codec
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