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L830-EB-11 Hardware User Manual
Page 29 of 39
Description:
I2S interface can be configured as master or slave mode.
It supports multiple audio sampling rates (44.1KHz,32KHz,24KHz,16KHz,8KHz).
It supports 16bit and 32bit mode.
3.8.2 PCM Mode
In the case of the Bluetooth (BT) call, the PCM mode is used to transmit digital voice data if the BT chip
does not support I2S. For the scenario, the module works as the PCM master, and BT works as the PCM
slave mode. The signal connection under the PCM mode is shown in Figure 3-19:
Figure 3-19 Signal Connection for PCM Mode
Description:
The PCM mode interface can be configured as master or slave mode.
It supports various audio sampling rates (444.1KHz,32KHz,24KHz,16KHz,8KHz).
It supports short frame sync for 16 and 32 bit mode.
It supports burst and continuous transmission modes.
It supports clock length trigger for frame sync signal and rising/falling edge trigger for data
transmission.
Note:
The PCM mode timing is relative complicated to adjust, and the audio quality will be reduced if it
is not fine tuned. In contrast to PCM mode, I2S mode is easier to adjust, hence it is
recommended to use I2S mode.
3.9
I2C Interface Description
The L830 module supports one I2C interface, which is configured as I2C master by default. The I2C
master is used for driving external I2C slave devices, such as the Audio Codec.
