Lots of resources describe the DRV8825 as a "drop-in replacement" for A4988.
But according to their respective pinouts, the pin that on the A4988 is a 5v input, is a fault signal output on the DRV8825?
How then can they be interchangeable? If the DRV8825 sets the pin low, would that not cause a short if you have 5v going into it?
I assume I have misunderstood something.
From the Pololu DRV8825 webpage
Note that the carrier (DRV8825) includes a 1.5k protection resistor in series with the FAULT pin that makes it safe to connect this pin directly to a logic voltage supply, as might happen if you use this board in a system designed for the pin-compatible A4988 carrier. In such a system, the 10k resistor between SLEEP and FAULT would then act as a pull-up for SLEEP, making the DRV8825 carrier more of a direct replacement for the A4988 in such systems
So no short will happen