LIS2DH12 bypass capacitor

[sparky619]

Hi, I'm putting down a LIS2DH12 accelerometer on a new PCB. The datasheet calls for an aluminum capacitor on VDD, but the eval board (STEVAL-MKI151V1) shows a small capacitor that looks like a ceramic. I don't know for sure because I can't find the BOM for the eval board. I really don't have clearance for an electrolytic capacitor. How critical is it?

[Andrew Neil]

STEVAL-MKI151V1 BoM:

https://www.st.com/en/evaluation-tools/steval-mki151v1.html#cad-resources

[sparky619]

Thank you!

[sparky619]

BOM lists that capacitor as a generic polarized.. but the silkscreen is not marked with polarity and the gerbers do not show the right size for a polarized capacitor. Still wondering why a polarized capacitor is called out in the datasheet for the sensor.

[Federica Bossi · Accepted solution]

Hi @sparky619 ,

The purpose of 10uF capacitor is to have a tank capacitor close the device. It is also possible to use MLCC capacitor instead of aluminum type.

[Andrew Neil]

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@Federica Bossi wrote:

It is also possible to use MLCC capacitor instead of aluminum type.

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So the datasheet should be updated to reflect this:

https://www.st.com/resource/en/datasheet/lis2dh12.pdf#page=20