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marchalloakbow
marchalloakbow
Associate II
February 18, 2021
Solved

About DFSDM_TUTORIAL.xlsx

  • February 18, 2021
  • 6 replies
  • 2399 views

hello

​

I have a question about the tutorial for the DFSDM excel file.

https://www.st.com/content/ccc/resource/technical/document/technical_article/group0/1b/40/1d/43/1b/8d/47/65/dfsdm_tutorial/files/dfsdm_tutorial.xlsx/jcr:content/translations/en.dfsdm_tutorial.xlsx

​

In the "DFSDM configurator" sheet, what the "Sampling frequency" on B6 cell means?

I am setting the clock frequency (2～3.25MHz for MEMS mic) and results similar sampling rate with actual data plot. 

I'd like to make sure I understand the parameter correctly.

Thanks in advance.

Masaru

This topic has been closed for replies.
Best answer by Imen.D

Hi @marchalloakbow​ ,

Sorry for the delayed reply on this.

The “sampling frequency�? means the input serial clock – rate at which is the serial data provided from the sigma-delta modulator.

Each parameter has in XLS some hint – to show explanation. For example:

0693W000007ZCweQAG.jpg 

Please mark my answer as best by clicking on the "Select as Best" button if it fully answered your question. This will help other users find this solution more quickly.

Imen

6 replies

I
Imen.D
ST Technical Moderator
February 18, 2021

Hello @marchalloakbow​ ,

You should make sure to select right Trigger slection.

Which mode are you using (Serial/parallel mode) ?

Please share your paramater setting for check your use case.

Imen

In order to give better visibility on the answered topics, please click on 'Best answer' on the reply which solved your issue or answered your question. Thanks
marchalloakbow
marchalloakbowAuthor
Associate II
February 18, 2021

@Imen DAHMEN​ 

Hello Ms. Imen​, thank you for your comment.

I am using Serial mode, and Trigger selection is continuous, 64000 Hz.

Besides the question above, I'd like to know where to read to understand these trigger setting.

I
Imen.D
ST Technical Moderator
February 19, 2021

Let me check with the expert team and will come back to you with details.

Imen

In order to give better visibility on the answered topics, please click on 'Best answer' on the reply which solved your issue or answered your question. Thanks
marchalloakbow
marchalloakbowAuthor
Associate II
February 19, 2021

@Imen DAHMEN​  OK, I look forward to the details!

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