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4.3. PCM and I2C
The module provides one Pulse Code Modulation (PCM) digital interface and one I2C interface for
VoLTE*
only. The PCM interface supports the following modes:
Table 14: Pin Definition of PCM Interface
Pin Name
Pin No.
PCM_CLK
4
PCM_SYNC
5
PCM_DIN
6
PCM_DOUT
7
Table 15: Pin Definition of I2C Interface
Pin Name
Pin No.
I2C_SCL
40
I2C_SDA
41
The reference design is illustrated as follows:
BG950A-GL&BG951A-GL_Hardware_Design
Interfaces*
I/O
Description
DO
PCM clock
DO
PCM data frame sync
DI
PCM data input
DO
PCM data output
I/O
Description
OD
I2C serial clock (for external codec)
OD
I2C serial data (for external codec)
Figure 17: Reference Circuit of PCM Interface
LPWA Module Series
Comment
1.8 V power domain.
If unused, keep this pin open.
Comment
External pull-up resistor is
required.
1.8 V only.
If unused, keep this pin open.
43 /89
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