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hall sensor - quiscent voltage

vamsee

Jan 10, 2013
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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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Harald Kapp

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A second best method would be using the AC range of your voltmeter. It should show only a few mV AC at best. If you see more than 100mV AC, your circuit is almost certainly oscillating.
 

vamsee

Jan 10, 2013
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A second best method would be using the AC range of your voltmeter. It should show only a few mV AC at best. If you see more than 100mV AC, your circuit is almost certainly oscillating.

it showing 0.9V :(

what shud i do, to reduce the oscillations?
 

CDRIVE

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May 8, 2012
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OK, sorry about that. It should be close to zero then. Once again... bad sensor, wired wrong? Not much options left.

Chris

Second apology. I have no idea how I transposed data for an A1301 - A1302, who's outputs go to near 0V with no magnetic field, with your A1321 - A1323 which don't.

Chris
 
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vamsee

Jan 10, 2013
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Hi guys!! thank u very much for ur suggestions..

Now its working fine..

I changed my hall sensor A1322 to A1325. Output also changing linearly as the magnetic field varies.

Thanx all once again..
 
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