Quectel EG91 Series Hardware Design page 50

PCM_CLK
PCM_SYNC
PCM_DOUT
PCM_DIN
The following table shows the pin definition of PCM and I2C interfaces which can be applied on audio
codec design.
EG91_Hardware_Design
125us
1 2
MSB
LSB
MSB LSB
Figure 22: Primary Mode Timing
Figure 23: Auxiliary Mode Timing
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LTE Module Series
EG91 Hardware Design
255 256
MSB
MSB