We are using NXP’s MMA8653FC accelerometer sensor in a vibration sensing product (vehicular). We developed and tested, both in the lab and in the field, over 40 prototypes without issue in the past 18 months. Following pilot production we have experienced a failure rate of around 9%, some 450 assemblies during the self-test procedure. After investigation we discovered that the device in the failed assemblies are sending the same value for Z-axis, 0x80 or 0x79 (we are using 8 bit in our application).
Further research within the forum identifies the problem of ‘stiction’ (see attachment) however, this was apparently addressed and rectified in this part number 2013. Our production stock is from week 42, 2017. The devices were stored for 14 months prior to mounting in late April, 2019. The re-flow process shows no abnormalities. We are in the process of lodging the necessary paperwork for NXP to investigate but, as this will take some time, I’d like to ask if anyone else has any experience or feedback regarding the same?
Thanks in advance.