Expanding PDM channel count & frequency

[Roger]

The question is almost the same as in this other thread, but some moderator just blocked it and he said to me to open a new thread..., since I have to open a new thread, I will extend my question.

I'm trying to get ultrasonic sounds using SPH0641LU4H-1, according to the thread above linked, just changing the SINC_RATE parameter does the job, but I could not find the SINC_RATE parameter either in PCM_PDM example in ModusToolbox or PSoC creator. So...

1.- Where can I find this parameter?

2.- Which are the ranges of this parameter?

3.- Which PSoC 6 can I use to get ultrasonic sound from a PDM microphone since some of them seem limited at 24.000Hz?

Thanks.

[RodolfoGL · Accepted solution]

The SINC_RATE is linked to decimation rate.

In PSoC Creator, double click in the PDM/PCM component and go to:

Timing > Sinc Decimation Rate

It is calculated as Rate = 2 x SINC_RATE

In ModusToolbox, open the design.modus and go to:

Digital > PDM-PCM Converter > Timing > Sinc Decimation Rate

It is also calculated as Rate = 2 x SINC_RATE.

If you are using PDM/PCM HAL, there is a variable in the cyhal_pdm_pcm_cfg_t called decimation_rate.