• In the Headset design, we use I
2
C interface to configure CODEC.
• The NXH3670 communicates with CODEC using I
2
, the attached jumpers of 9-10,
11-12, and 13-14 indicate that they can transfer data directly without the extra operation of K32L2B.
• User must make sure the existence of jumper 9-10 (J10 CLK_SELECT, the yellow jumper OSC_MCLK
(12.288 MHz) in
), as it is used to obtain 12.288 MHz frequency and then can provide 24.576 MHz
frequency to
I2S_MCLK
.
NOTE
3 Software introduction
3.1 Audio path
The Bluetooth LE Audio System consists of two channels:
1. The forward-channel transmits the audio from the PC to the Headset.
2. The backward-channel transmits the microphone signal from the Headset to the PC.
3.1.1 Forward audio channel
• The forward-channel is a stereo-channel.
• The RF transports the forward-channel as 16-bit samples @ 48 KHz sample-rate.
• The I
2
S bus emulated by FlexIO and USB signals uses 48 KHz sample-rate.
Figure 6. Data path of forward audio system
3.1.2 Backward audio channel
• The backward-channel is a mono-channel, only the left channel used.
• The RF transports the backward channel as 16-bit samples @ 16 KHz sample-rate.
• The I
2
S bus emulated by FlexIO and USB signals uses 48 KHz sample-rate.
Figure 7. Data path of backward audio system
NXP Semiconductors
Software introduction
Getting Started with NxH3670 Gaming Use Case, Rev. 0, 01/2020
Application Note
5 / 15
