Product Info

LTE Module Series
EC21 Hardware Design
EC21_Hardware_Design
3-47
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Figure 22: Primary Mode Timing
Figure 23: Auxiliary Mode Timing
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.
I/O
Description
Comment
PCM_IN
24
DI
PCM data input
1.8V power domain
PCM_OUT
25
DO
PCM data output
1.8V power domain