Hi Adam, A) Not as far as I know, and I'm not seeing anything documented internally. All pins have the same input protection (ESD diode to VDD/ground). B) I don't see anything risky with the schematic. Improper configuration of the VREFIO pin according to the recommended operating conditions table would not damage the device. it just won't operate properly. Operating VREFIO outside of the absolute maximum ratings table would damage the device. You're using the internal reference, so there is no risk of improper VREFIO/VDD power sequencing. You could power the chip with 5V to be outside of that edge condition, but I'm not so sure this is the source of your issue, so I wouldn't be able to say if this would help. Is replacing the DAC the only way to get out of the stuck condition? Power cycling or software resets don't help? Since replacing the DAC on the 2.91V stuck DAC, have any DACs on that board seen issues with the new FW? Best, Katlynne Jones
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