MMA8451 motion and transient detection

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MMA8451 motion and transient detection

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tadeuszstudnik
Contributor I

Hi. 

It is posible to configure MMA8451 to detect motion and transient simultaneously?

I can configure MMA8451 to motion detection or transient but if i configure both and assing interrupt to int1 and int2, it doesn't work.

Thanks in anticipation!

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lisettelozano
NXP Employee
NXP Employee

Hello Tadeusz,

It is not possible to use the motion and the transient detection functions together.

However, the transient detection and the motion detection functions are similar except that in the transient detection the high-pass filtered data is compared. There is an option to disable the high-pass filter (0x1D: TRANSIENT_CFG register), in which case the behavior of the transient function will be the same as the motion detection allowing to have two motion detection functions. For this, please check section 6.5 of the datasheet and application note AN4071.

I hope this information can be helpful.


Have a great day,

Paulina

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