Figure 22: Reference Circuit of I2S Application with Audio Codec
4.6. PCM Interfaces
The module provides two PCM digital interfaces, one is used for SLIC or Codec (multiplexed with I2S*),
the other is only for Bluetooth audio*. PCM interfaces support the following modes:
⚫ Primary mode (short frame synchronization, works as both master and slave)
⚫ Auxiliary mode (long frame synchronization, works as master only)
In primary mode, the data is sampled on the falling edge of the PCM_CLK and transmitted on the rising
edge. The PCM_SYNC falling edge 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 also supports 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 PCM_SYNC rising edge represents the MSB. In this mode, PCM interface operates with a
256 kHz, 512 kHz, 1024 kHz or 2048 kHz PCM_CLK and an 8 kHz, 50 % duty cycle PCM_SYNC only.
The I2S interface can be multiplexed as PCM function and is configured as PCM by default. If you need
I2S function, contact Quectel Technical Support.
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