The SS495-S sensor
The Honeywell SS495B-S [1] is a ratiometric (linear) Hall sensor. It contains a Hall plate which generates a p.d. when exposed to an external magnetic eld, and a differential ampli er, both housed in a 3mm square package. This is illus- trated in gure 1.
The sensor has three pins, one of which is normally held at +5V, a central ground con- nection, and an output pin at which a B- eld- dependent voltage appears (B is the magnetic ux density). The sign of the output voltage depends on the direction of the B- eld applied to the sen- sor. This can be seen in the lower half of gure 1.