Pcm And I2C Interfaces - Quectel BG772A-GL Hardware Design

3.12. PCM and I2C Interfaces*

BG772A-GL provides one Pulse Code Modulation (PCM) digital interface and one I2C interface for
VoLTE only. The following table shows the pin definition of the two interfaces which can be applied on
audio codec design.
Table 16: Pin Definition of PCM and I2C Interfaces
Pin Name Pin No.
PCM_CLK 3
PCM_SYNC 35
PCM_DIN 2
PCM_DOUT 34
I2C_SCL 37
I2C_SDA 5
The following figure shows a reference design of PCM and I2C interfaces with an external codec IC.
Figure 19: Reference Circuit of PCM Application with Audio Codec
NOTE
PCM and I2C interfaces support VoLTE only.
BG772A-GL_Hardware_Design
I/O Description
DO/PD PCM clock
DO/PU PCM data frame sync
DI/PU PCM data input
DO/PU PCM data output
OD I2C serial clock (for external codec)
OD I2C serial data (for external codec)
LPWA Module Series
BG772A-GL Hardware Design
Comment
1.8 V power domain
Require external pull-up
to 1.8 V
Require external pull-up
to 1.8 V
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