Hall effect reading

Hi everyone!

I´m in need to read a ratiometric hall effect sensor from Allegro (UNG3503), with a PIC12F675 and a minimum of components because of the space available.
This sensor outputs half Vdd when no magnetic field is detected (i.e. 2,5V), and increase/decrease 1,3 mV/Gauss.

Is there any "hint" to obtain readings as low as 1 Gauss only using sensor + pic, or I´ll have to use an amp.op also?

Txs

Quote:

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Originally Posted by ewandeur

Hi everyone!


Is there any "hint" to obtain readings as low as 1 Gauss only using sensor + pic, or I´ll have to use an amp.op also?

Txs

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YESS ... a 1.024 v ref. would give you only 1 unit per Gauss ...

so, an amp is needed with a voltage translator to get the best of your ADC ...

gain will depend on your measuring range ...

Alain