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4.
Please note that the module's CTS is connected to the host's CTS, and the module's RTS is
connected to the host's RTS.
4.4. PCM and I2C
The module 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 18: Pin Definition of PCM Interface
Pin Name
Pin No.
PCM_CLK
4
PCM_SYNC
5
PCM_DIN
6
PCM_DOUT
7
Table 19: 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
I2C serial clock
OD
(for external codec)
I2C serial data
OD
(for external codec)
LPWA Module Series
Comment
1.8 V power domain.
If these pins are unused, keep
them open.
Comment
Require external pull-up to 1.8 V only.
If these pins are unused, keep them
open.
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