[Bug]: Pro-Micro Power Problems

[jrsteensen]

Discord Username

Noctum

Bug Summary

Problem 1: Power from ABSIS Bus backdrives the USB on pro-micro. (No known workaround or fix.)
Problem 2: Power from USB backdrives the ABSIS Bus.
Problem 3: Many clones use sub-par regulators not capable of handling the 12V we provide on the ABSIS bus.
Problem 4: Almost all (including many Sparkfun Pro-Micros) have power trace from regulator too close to ground, violating ERC, and causing an arc or short between the two, which fries the pro-micro upon powerup.

Problems 2 thru 4 would be fixed by duplicating the power protection circuit from the pro-micro on the PCB itself and including a diode to control power flow.

Applicable Part Numbers

ABSIS001-10 (ABSIS ALE), ABSIS007-10 (ABSIS PMS), OH5A2A4-23 (RALT CONTROLLER), OHC0015-10 (DDI/AMPCD CONTROLLER)

Release Version

Latest develop branch (towards v0.3.0)

Category

Electrical (PCBs/Wiring/etc)

Applicable End Item(s)

Upper Instrument Panel (UIP), Lower Instrument Panel (LIP), Center Tub (CT), Left Console (LCON), Right Console (RCON)

Built to print?

• I built (or attempted to build) the part to the OpenHornet print without any deviations.
• I am not building this part to the OH print. (List deviations in detail in the Miscellaneous Info text area below.)