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MMA8452QR1 Z Axis Stuck

Question asked by Michael Pasternak on Dec 27, 2018
Latest reply on Jan 2, 2019 by Tomas Vaverka

We use the NXP MMA8452QR1 accelerometer.

We assembled 50 devices. In 10% of devices we see that the Z Axis is stuck:

  • No change in the value read
  • Self-test mode does not change it.
  • Oblique tapping (z-axis direction) will sometimes provide a temporary fix
  • Problem returns in some of the “fixed” cases

 

BTW - Replacement of this chip solves this problem.

 

Can anybody explain what’s wrong?

Elements, assembly process, anything else?

 

Please advise.

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