Table 14: Pin Definition Of Pcm And I2C Interfaces - Quectel EC21 Series Hardware Design

PCM_CLK
PCM_SYNC
PCM_OUT
PCM_IN
PCM_CLK
PCM_SYNC
PCM_OUT
PCM_IN
The following table shows the pin definition of PCM and I2C interfaces which can be applied on audio
codec design.

Table 14: Pin Definition of PCM and I2C Interfaces

Pin Name Pin No.
PCM_IN 24
PCM_OUT 25
PCM_SYNC 26
EC21_Hardware_Design
1 2
MSB
MSB
Figure 22: Primary Mode Timing
125us
1 2
MSB
MSB
Figure 23: Auxiliary Mode Timing
I/O Description
DI PCM data input
DO PCM data output
IO PCM data frame sync signal
Confidential / Released
125us
255 256
LSB MSB
MSB
LSB
15 16
LSB
LSB
Comment
1.8V power domain
1.8V power domain
1.8V power domain
LTE Module Series
EC21 Hardware Design
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