Pcm And I2C Interfaces - Quectel EG060K Series Hardware Design

Figure 22: Reference Circuit of PCM and SPI Application with SLIC

4.5. PCM and I2C Interfaces

The module supports audio communication via PCM (Pulse Code Modulation) digital interface and I2C
interfaces. The PCM interface supports the following modes:
⚫
Primary mode (short frame synchronization): the module works as both master and slave.
⚫
Auxiliary mode (long frame synchronization): the module works as master only.
In primary mode, the data is sampled on the falling edge of PCM_CLK and transmitted on the rising
edge. The falling edge of PCM_SYNC represents the MSB. In this mode, the PCM interface supports
256 kHz, 512 kHz, 1024 kHz or 2048 kHz PCM_CLK at 8 kHz PCM_SYNC, and 4096 kHz PCM_CLK at
16 kHz PCM_SYNC.
In auxiliary mode, the data is sampled on the falling edge of the PCM_CLK and transmitted on the rising
edge. The rising edge of PCM_SYNC represents the MSB. In this mode, the PCM interface operates
with 256 kHz PCM_CLK and 8 kHz, 50 % duty cycle PCM_SYNC only.
The module supports 16-bit linear data format. The following figures show the primary mode's timing
relationship with 8 kHz PCM_SYNC and 2048 kHz PCM_CLK, as well as the auxiliary mode's timing
relationship with 8 kHz PCM_SYNC and 256 kHz PCM_CLK.
EG060K &EG120K _Series_Hardware_Design
103
PCM_CLK
PCM_SYNC
PCM_DOUT
PCM_DIN
SPI_CS
SPI_CLK
SPI_DOUT
SPI_DIN
INT
RST
Module
LTE-A Module Series
PCM
SPI
INT
RST
SLIC
50 /