CD00237391 Datasheet, PDF (163/177 Pages) STMicroelectronics – ARM-based 32-bit MCU, 150DMIPs, up to 1 MB Flash/128+4KB RAM

STM32F20xxx
Application block diagrams
Figure 94. Master clock (MCK) used to drive the external audio DAC
I2S_CK
/I2SD
I2S controller
2,3,4,..,129
/8
/(2 x 16)
for 16-bit stereo
F_SAUDIO
I2S_MCK = 256 × F_SAUDIO
= 11.2896 MHz for F_SAUDIO = 44.1 kHz
= 12.2880 MHz for F_SAUDIO = 48.0 kHz
I2S_SCK⁽¹⁾ = I2S_MCK/8 for 16-bit stereo
= I2S_MCK/4 for 32-bit stereo
/4
/(2 x 32)
for 32-bit stereo
F_SAUDIO
1. I2S_SCK is the I2S serial clock to the external audio DAC (not to be confused with I2S_CK).
Figure 95. Master clock (MCK) not used to drive the external audio DAC
ai16042
I2S controller
I2SCOM_CK
/I2SD
/(2 x 16)
for 16-bit stereo
/(2 x 32)
for 32-bit stereo
F_SAUDIO
F_SAUDIO
I2S_SCK⁽¹⁾
ai16042
1. I2S_SCK is the I2S serial clock to the external audio DAC (not to be confused with I2S_CK).
Doc ID 15818 Rev 9
163/177