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FAQ
How to set the I2S sampling frequency and select an external crystal? Issue Date：2015-11-02
The following table lists common sampling frequency in accordance with the formula of I²S clock sources.
If the system only requires a sampling frequency, the clock source can be determined by an external crystal. If two or more sampling frequencies are required, most of the chips will be limited to hardware restrictions. Each sampling frequency can only be the result of I2S clock source divider.
In the NUC140 series, for example, the I2S selects 12.288 MHz as clock source and 16 bits, and the available sampling frequency are 96K, 48K, 32K, 24K, 19.2K, 16K, 12K, 9.6K, 8K and 6K. As to the 44.1K, 22.05K and 11.025K, the clock source must be changed to 5.6448 MHz.
|
I2S_BCLK = I2S_CLK /(2x(BCLK_DIV + 1)) = SR * Length * 2 |
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|
Sampling Rate |
I2S_BCLK (8-bit) |
I2S_BCLK (16-bit) |
I2S_BCLK (32-bit) |
I2S_CLK |
|
192000 |
3072000 |
6144000 |
12288000 |
24576000 |
|
96000 |
1536000 |
3072000 |
6144000 |
12288000 |
|
48000 |
768000 |
1536000 |
3072000 |
6144000 |
|
44100 |
705600 |
1411200 |
2822400 |
5644800 |
|
32000 |
512000 |
1024000 |
2048000 |
4096000 |
|
22050 |
352800 |
705600 |
1411200 |
2822400 |
|
19200 |
307200 |
614400 |
1228800 |
2457600 |
|
16000 |
256000 |
512000 |
1024000 |
2048000 |
|
12000 |
192000 |
384000 |
768000 |
1536000 |
|
11025 |
176400 |
352800 |
705600 |
1411200 |
|
9600 |
153600 |
307200 |
614400 |
1228800 |
|
8000 |
128000 |
256000 |
512000 |
1024000 |
|
6000 |
96000 |
192000 |
384000 |
768000 |
| Products: | Microcontrollers ,Arm Cortex-M0 MCUs ,Nano100/102 Base Series ,Nano110/112 LCD Series ,Nano120 USB Series ,Nano130 Advanced Series ,NUC100/200 Advanced Series ,NUC120/122/123/220 USB Series ,NUC130/230 CAN Series ,NUC140/240 Connectivity Series ,Arm Cortex-M4 MCUs ,M451 Base Series ,M451M Series ,M452 USB Series ,M453 CAN Series ,NUC442/472 Series ,NUC505 Series |
|---|---|
| Applications: | |
| Function: | Peripherals,Connectivity,I2S |