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LIS2DH12 bypass capacitor

sparky619
Associate

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?

1 ACCEPTED SOLUTION

Accepted Solutions

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.

In order to give better visibility on the answered topics, please click on 'Accept as Solution' on the reply which solved your issue or answered your question.

View solution in original post

5 REPLIES 5
Andrew Neil
Super User

STEVAL-MKI151V1 BoM:

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

 

A complex system that works is invariably found to have evolved from a simple system that worked.
A complex system designed from scratch never works and cannot be patched up to make it work.

Thank you!

sparky619
Associate

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.

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.

In order to give better visibility on the answered topics, please click on 'Accept as Solution' on the reply which solved your issue or answered your question.

@Federica Bossi wrote:

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


So the datasheet should be updated to reflect this:

AndrewNeil_0-1749724575544.png

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

 

A complex system that works is invariably found to have evolved from a simple system that worked.
A complex system designed from scratch never works and cannot be patched up to make it work.