Hi, I believe we might be experiencing this issue as well.
We have 4 custom boards using the BNO055 (no external crystal) and 2 of them seem to be having the reset issue while the rest behave just fine.
Is this clock issue consistent or intermittent?
It is currently unclear if the issue is consistent or not. The text from the official Microchip Errata is not very precise. See section 1.5.7
We've updated our design to include an external crystal to mitigate the power on reset issue.
We did not use the same crystal as the bosch bno055 shuttle board since it was too large for our design but instead went with a smaller 2 pin crystal oscillator (32.678khz) with PN: FC-135R32.7680KA-AG3
Is there a particular reason Bosch went with the large tuning fork oscillator? PN: MS1V-T1K 32.768kHz 7pF +/-20PPM TA.
Attached is our schematic for the BNO055. We would really like to get this right the second time around so any help verifying this design would be greately appreciated!