nRF5340 PDM CLK waveform

[Poki Huang]

Hi

We use nRF5340, set GPIOs as PDM for DMIC device, and measure waveform as below

The PDM DATA high level will decrease periodically

Is this waveform normal? If yes, which setting can cause this result? If not, any thing we can check?

Thank you

 

Poki

[Asbjørn]

Hello Poki,

No, this doesn't look right. What sort of HW are you measuring on? It seems the PDM_DATA at high will be leaking when the clock is hig.

Q1: What HW are you measuring on?

Q2: Difficult to see from the screen shot, but are the two signal high level at the same level?

Q3: Are there any other components on the PDM_DATA line?

Best regards

Asbjørn