Class D SPKR A/B Output on STM32F407 Discovery evaluation board

[delanokeuter]

Posted on November 14, 2015 at 19:02

Dear all,

Is there a way to use the Class D functionality in the CS43L22 audio codec on the STM32F407 Discovery Kit?

 

I have been looking at the schematics for some time now, but it seems that the SPKR A+, A-, B+, B- power outputs of the codec are not connected to any GPIO pin on the board... am I missing something?

#speaker #cs43l22 #stm32f407

[romanetz4]

Posted on November 15, 2015 at 16:33

Right, only headphones outputs are available. I think that its due to the weak load capability of 2V5 regulator. But you may try to solder thin wires to pins 4,6,7,9 of the chip and change output device when init the CS43L22. Of course, don't forget to change 2V5 regulator to more powerful.

[delanokeuter]

Posted on November 16, 2015 at 12:15

Oke, thanks for confirming my suspicions. I'll try another way around.