My powerStep01 is constantly triggering the Overcurrent alarm whenever I give a movement command, even if there is no stepper connected. What could possibly be causing this? Previously I was getting a similar effect on the L6470 chip. When I turned off the overcurrent shutdown feature the chip fried and apparently took out GPIO25 of the Raspberry Pi that was command it. In both cases, the motors never moved.
Yes, looking at the status register I only see that the device has detected an UVLO and and UVLO on the ADC (both bits = 0). Also OCD is active low, so OCD =1 means no overcurrent detected. UVLO and UVLO_ADC are the ones that keep the red LED on.
An UVLO_ADC is detected because the X-NUCLEO-IHM03A1 by default does not have any component mounted on the ADC pin, so the voltage on it is around zero. In my board I've already some components on ADC, I forgot to specify it :grinning_face_with_sweat: .
I see two possibilities:
The other bit UVLO is referred to Vs: at the start up there is always a detection because the voltage supply is ramping-up
All these bits are latched, meaning that even if the UVLO condition is gone, the bits stay in the error condition until a "GetStatus�? command is sent.
I expect that if 18V are applied on Vs and you send a "GetStatus�? , the UVLO bit becomes 1 (error released).
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