Iis3dwb temperature leads to sampling rate deviation and inaccurate FFT

[SsfChen]

Hello ST engineer, our company is currently using your iis3dwb MEMS sensor. We have encountered an issue where we have found that its sampling rate is not the standard 26667 in different environments and varies depending on temperature. Additionally, during frequency domain conversion, the frequency spectrum waveform is shifted due to inaccurate sampling rate input. Do you have a solution to this problem? We have tried linear interpolation, but the effect has been poor.

 

[SsfChen]

The error is still high even after using this register for calculation。

[Federica Bossi]

Hi @SsfChen ,

Is the variation you observed aligned to the value reported on the datasheet?