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Originally Posted by Gal Longin
I've been having abit of a problem connecting the hall effect sensors with the 4 pins. i looked at the file on http://www.allegromicro.com/datafile/0660.pdf and it said that one pin is for +v one is for GND and one is the output signal and the one left is also for GND . it seems a bit weird to me. perhaps i'm not understanding it correctly. why would you need two pins for GND. do you really have to connect both the 3rd and the 4th pin to the GND?
please help me figure this out. what is the correct way to connect it?
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If you scan down from page one you will see a reference that Pin 3 is an internal connection, scan a little further and you will see that it "must" be tied to ground externally.
It may be an electrocstatic shield or it may be the shell of the magnetic structure. Four pins tied to a PCB are better than three.