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Published 20 hours ago • verified publisher icon makerbase-mks

External Motor Driver Voltage

Open pionex opened this issue 1 year ago • 1 comments

I am trying to drive external drivers, but I'm only seeing about 3.7v out of the external drive pins. When set to inverted drive mode, the logical low is 1.2v. Is there some reason this chip is not driving 0-5v? The 74HC595 chip has 5v on VCC, so I'm not sure why the output voltage is so low. This is measured with my scope and DMM with no load and nothing plugged into the rest of the board. Is this voltage normal?

pionex avatar Aug 15 '23 00:08 pionex

It seems to me like this board should have a 74HCT595 (CMOS with TTL compatible inputs) instead of a 74HC595 (pure CMOS). I have replaced the chip on my board and now it works properly.

pionex avatar Sep 12 '23 03:09 pionex