Hi - I’m going to purchase an Allegro 3213 hall effect sensor to experiment with detecting model trains on a layout. I’m looking at the example circuit diagram from:
I’ve got a couple of questions.
What is the 10pF capacitor for on Vout ? The sensor output is HIGH when no magnetic field is detected and the MOSFET ties it LOW in the presence of a magnetic field.
Secondly, the data sheet says it can sink 1mA on Vout. What sort of current will a micro controller draw when reading that output ?