I have two new Automation pHats and a new Pi 3 B v1.2 Neither pHat works properly with the sample “read inputs” program when plugged in bare with no wires or other equipment attached. The pHat is detected but the _update deamon throws an IOError and dies. When I check the voltages on the pHat (header and outputs) the 3.3V is nominal but the 5V is less than 0.5V. With no pHat connected both 3.3V and 5V are nominal at the header. I’m using a 2.5A “official” supply and the Pi 3 shows no other operational problems.
- What quiescent current should the pHat draw on 3.3V and 5V lines?
- Is there anything else I could look at?