We are in pre production with the ICM42688-P on our product. We have just had an issue we cannot explain as to either a soft of hard fault. It appears to only affect a single device.
We were performing the Self-Test call as per the example in SmartMotion_4.1.8 library codes which contains 2.0.5 ICM4xx driver and examples. This now is consistently failing and on skipping the test we can see the Z-Axis has somehow moved a significant distance from Zero while the device is stationary. The self-test code returns failure due to this it would seem.
When it occured The Self-Test suddenly started failing after self test was ran multiple times in potentially quick-ish succession. (USB power was toggled via plug/unplug to device
Questions are:
- Is there a hardware fault such as a loose Solder pad joint that could have caused this? (Device is only couple of days since fab)
- Is either a library error in the TDK code that could cause this?
- Is there a persistent register that may eb affected to cause this i.e. If self-test is interrupted partway through etc
Any help greatly appreciated as to diagnosing if the issue is known or the chip may just be faulty etc.
Cheers