OK – you’ve confirmed that I’m probably on the right track with the power management settings. However I’ve now definitely confirmed that these settings do NOT always work. My mDOTs frequently power up working in this mode, but not always. I set reset low on the mDOT for about 2 seconds after power is applied, and that reduces the occurrence rate but it still happens a lot (started out at 10mS but that didn’t seem to help much). When it does happen, it always happens on a specific device until I let it sit with power removed for a while. Makes me suspect something is powering up in a bad electrical state and needs all voltages to completely leak off to get reset.
Is the mDOT sensitive to power turn-on slope? Are there any pin states I need to define on power-up (I’m leaving all except resetb floating)? Supply voltage is 3.3V.
Any help is appreciated!!