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?