With the exception of some specific products, most AMR sensors deliver
digital output at the Hi
and Lo levels.
Depending on the product, some sensors output a Hi signal (positive logic)
when switched on, and
other sensors output a Lo signal (negative logic) when switched on, and so check the respective
datasheet for details.
The typical values are as follows: Vout at Hi level = Vcc x 0.9V or more, and Vout at Lo level = Vcc x 0.1V or less.