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sinara-hw / AUX_PSU

Low noise, 3-channel, regulated power supply module
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[Schematic review] T28 always open #8

Closed mkiepiela closed 3 years ago

mkiepiela commented 3 years ago

What is the purpose of T28? It will be always open, regardless if Kasli is connected or not (P3V3_MP exists or not).

obraz

gkasprow commented 3 years ago

It's a voltage translator

mkiepiela commented 3 years ago

Take a look at this once again, please. It does not look like voltage translator. P-MOS will be always open. On the En line will be more than 8V (R57/R98 voltage divider additionally pulled up by R64 and LD1D).

gkasprow commented 3 years ago

Right! There should be NMOS. I didn't notice that PMOS was used instead