mma8451q reading problem

vanajagujjala — Tue, 03 Feb 2026 23:08:53 GMT

hai,any one help me on accelerometer mma8451q,my problem is enabled motion and transient interrupts for to get shock or shake.And fullscale is 8g,and threshold for the interrupt is 4g,but for a small shake i am getting 8g count on X,Y,Z values.whether i didn't understand accelerometer properly i don't know.how can i convert x,y,z count values into with respect to threshold or fullscale,can any one explain this if you understand my problem.

thank you.

Re: mma8451q reading problem

reyes — Wed, 19 Mar 2014 17:05:52 GMT

Hi Vanaja,

In section 8 of the application note AN4076 you can find how to stream the 8-bit data from the accelerometer and how to convert these count values into signed decimal fractional in g’s.

AN4076: http://cache.freescale.com/files/sensors/doc/app_note/AN4076.pdf

In this application note you can find all the basic settings needed in order to get the acceleration data and hoe to manipulate this data.

There is a downloadable example code about this complete Application Note, you can download it from the following link: http://cache.freescale.com/files/sensors/doc/app_note/AN4076SW.zip?fpsp=1

Regards,

Jose

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mma8451q reading problem

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