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PCM4222: PCMEN pin control

Amy Luo
Expert 6895 points
Part Number: PCM4222
Other Parts Discussed in Thread: PCM4220

Hi team,

Problem: after PCMEN pin of PCM4222 is pulled down, PCM still outputs. PCM output cannot be turned off, only after PCM4222 RST is reset can PCM output be turned off.

The IO of STM32 is directly connected to the PCMEN pin of PCM4222. PCMEN pin high level is 3.3V, low level is 0V. There is no problem with using a multimeter to test the level.

STM32 I2S is used to collect PCM4220 data, STM32 is used as slave and PCM4220 is used as master. After STM32 I2S is ready, data can be collected normally after PCMEN is enabled. However, data can still be collected after PCMEN is disabled. Only after the PCM4222 RST can the PCM output be disabled.