LIS2DH12 fault

[lbing.1]

Hello everyone

Our device use lis2dh12 to measure the acceleration. We tested 10 boards. But we find 3 board work abnormal.

These three board are all facing up, the reading of x axis and y axis should be 0, and z axis should be 1g. But the readings of x/y/z are (33, -39, 31), (1, -6, 1541), (24, -7, 1115).

The other 7 boards work well.

We plan to produce a lot of boards, but the failure rate is too high.​ We understand that the chip itself is good. We want to know what are the reason of this.

Thanks.

LiBing

Best Regards

[Eleon BORLINI]

Hi @lbing.1​ , there could be a residual offset due to any tilt or bending caused by the soldering of the sample on the board. The suggestion is to measure this offset at application level and store it in a variable/define of the application firmware, subtracting it to the dataout acquisition in real time or in post-processing. Regards

[lbing.1]

Hi Eleon, Thank you very much for your reply and suggestion.

Your suggestion is good and useful. We will follow your suggestion and also pay attention on our soldering process. But I wonder the reading like (33, -39, 31), is it also caused by the offset? After all, the offset is too large. The z-axis reading should be 1g, but it's 31mg.

I mean are there any other​ factors may cause the sensor chip damage during production.

Thank you very much.

LiBing.

Best Regards