PCM codec power supply sequence

The EC200T talks about Power Supply for PCM Codec:

Captura de pantalla 2022-01-30 a la(s) 8.01.21 a. m.

To power on sugest power on 1.8v and then power on 3.3v

What happens if power on both power supplys at same time?

Best regards,


It may cause the Codec chip to not work properly. It is recommended to apply 1.8V first and then 3.3V.

I can apply 3.3v and 1.8v at same time and then restart PCM codec with software command?

I think it’s ok, you can try it once. Or use our recommended reference circuit to design.