What are the min/max parameters for the sensitivity for the LIS3DH?

[Nathalie MAGNIEZ]

Posted on September 07, 2013 at 17:37

What are the min/max parameters for the sensitivity for the LIS3DH?

#lis3dh #lis3dh #motion-sensor #accelerometer

[Thiago REIS]

Posted on September 09, 2013 at 18:19

Hello Naue,

At +/-2g full scale range, the typical sensitivity is 1mg/LSB and the min/max are 0.9/1.1. So it is +/-10%.

For more information, please visit

http://www.st.com/mems

Thank you,

Thiago Reis

From: naue

Posted: Saturday, September 07, 2013 5:37 PM

Subject: What are the min/max parameters for the sensitivity for the LIS3DH?

[gavrilov]

Posted on October 22, 2013 at 13:18

Hello Thiago.

How can it's may be, if ''LIS3DH embeds a 32-slot of 10bit data FIFO for each of the three output channels, X, Y and Z.'' and then 4g/1024=~4mg/LSB?

Thanks.

[Thiago REIS]

Posted on October 22, 2013 at 14:35

Hello Gav,

Following the same logic as mentioned on the topic earlier, for 4g the sensitivity should be 2mg/digit.

You can also reference the attached datasheet on page

Thank you,

Thiago

________________

Attachments :

LIS3DH.pdf : https://st--c.eu10.content.force.com/sfc/dist/version/download/?oid=00Db0000000YtG6&ids=0680X000006HzKl&d=%2Fa%2F0X0000000bK2%2F6K5TYcEPNknWmwcGcLmj3szb.Kemoo7iCAX8Ul44i1s&asPdf=false

[gavrilov]

Posted on October 23, 2013 at 06:30

Hello, Thiago.

Sorry, you did not understand me.

I would like to say that the values ​​of + /-2g with sensitivity 1mg/LSB not possible to pack in 10bit.

Because a 10-bit digit can hold data from 0 to 1023 only.

Consequently 1mg/LSB*1024 = 1g or only +/-0.5g.

But for a range of +/-2g, maximum amplitude signal equal to 4g.

And these 4g should be packed into 10bits, hence the maximum of sensitivity is possible 4g/1024 = 4mg/LSB only.

Value of sensitivity ​​are listed in the table on p.10 of the attached document is wrong, and contrary to both the document itself and the experimental data obtained with a real device.

The same document states that:p.17: ''The LIS3DH contains a 10bit, 32-level FIFO.''

p.19: ''LIS3DH embeds a 32-slot of 10bit data FIFO for each of the three output channels, X, Y and Z.''

And I can confidently confirm that the real LIS3DH issue only 10bit data.