Associate III

Question

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

Forum|Forum|7 years ago
January 18, 2019
6 replies
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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

Accelerometers

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Associate III

Anyone ?

ST Employee

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

Associate III

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

ST Employee

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

Associate III

Dear eleon,

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

Thanks

ST Employee

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