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buildbotics / bbctrl-pcb

Buildbotics CNC, 3D printer and other machine controller
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Supply motor logic from motor driver 5-volt supply #8

Closed DougCoffland closed 6 years ago

DougCoffland commented 9 years ago

a. We could avoid the second IRM-10-5 by using the 5v supply on the TMC2660. These could all just be ganged together. Saves ~$7.50.

DougCoffland commented 9 years ago

I misunderstood the capability of the 5VOUT pin. I did not think it could be used as a power supply. On further review it can supply 50ma. Unless anyone disagrees, I will eliminate the second IRM-5-10 as suggested, tie all of the 5VOUT pins together on each TMC2660 and use these outputs as a common supply for all +5VM needs.

jcoffland commented 9 years ago

Pin 13, aka V5OUT does not appear to be connected to the +5Vm net in the schematic. Also, if you look at the layout it's only connected to the bypass capacitor C7.

BTW, there's a useful feature in PCB you may not know about. If you select a pin or segment of a trace you can hit CTRL-F and it will highlight all the connected traces and pins in the schematic. Hit SHIFT-F to clear this selection.

jcoffland commented 9 years ago

I changed the title of this issue because we definitely do not want to do what it originally said. That would completely mess up our isolation.

DougCoffland commented 6 years ago

No longer desired.