According to the datasheet the A1321-1232 differ in noise and sensitivity, but all should have Vout=50%Vcc at zero mag. field. Something else is wrong.
Can you measure the Vcc and Vout with an oscilloscope to verify that these voltages are straight DC and none of the components is oscillating?
am afraid to say that, i dont have oscilloscope... Allegro has stopped production of the sensor which i am using now. guess that might be the reason, because they are not working fine
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