ST LIS2DE12 1LSb = 16mg @FS = +/- 2g ?

[antonius]

Dear ST Community Members,

I have question,

Related with

ST LIS2DE12 1LSb = 16mg @FS = +/- 2g ,

What does it mean in math calculation ?

Datasheet

https://www.st.com/resource/en/datasheet/lis2de12.pdf

page 43

Thanks

[antonius]

Anyone ?

[Eleon BORLINI]

​Hi antonius, the 1LSB you are referring (16mg) is the minimum selectable threshold. The sign and the axis of the threshold is selectable into the INT1_CFG (30h) register

[antonius]

Hi Eleon,

Can I use bottom view as reference for footprint on my PCB ?

or do you have a reference ?

so if the value = 0x01, it is 16mg @ +/- 2g FS, FS = full scale, correct me ?

Thanks

[Eleon BORLINI]

​hi Antonius

>> or do you have a reference ?

you can use the package info for the footprint design.

however, please follow the indication of technical note TN0018 (first link).

if you want to start from something existing, you can refer to component search circuit (second link), but be careful and check the correct import in your pcb design tool.

>> so if the value = 0x01, it is 16mg @ +/- 2g FS, FS = full scale, correct me ?

You're right. Remember to select sign and axis in INT1_CFG reg.

Links: https://www.st.com/content/ccc/resource/technical/document/technical_note/73/17/9c/16/dd/96/4a/01/CD00134799.pdf/files/CD00134799.pdf/jcr:content/translations/en.CD00134799.pdf

https://componentsearchengine.com/LIS2DE12TR/STMicroelectronics

[antonius]

Dear eleon,

So 2g = 2 g-force, 2 * gravitation force ? mg = mili g-force ?

Thanks

[Eleon BORLINI]

​hi antonius, yes, the "g" surface earth acceleration (9.8m/s^2) is the typical unit of measure for an accelerometer, and mg stands for milli-g