I don't really know if this sensor is tricky or not to use; based on what I presume is your post here:
http://letsmakerobots.com/node/34705(at least, it's by someone named "SeL" and uses the same images, asking the same question...)
Based on what people have posted there (code from OddBot for the 2SA10, link to the Hall Effect tutorial) - it seems like all you would need to do is provide a source of regulated voltage (which you could easily get from the Arduino itself - start with the 3.3V output), and monitor the voltage outputs for the XA/XB and YA/YB outputs (what your graphic notes as "poles") - in other words use four analog inputs.
You could then just try dumping the output of all four reads to the terminal; likely, you could use the code (or some minor variant) that OddBot posted on LMR (which would be for one axis only, of course); something akin to:
int xangle, yangle;
double XA, XB, AX;
double YA, YB, AY;
void setup() {
}
void loop() {
XA = (analogRead(0) - 512);
XB = (analogRead(1) - 512);
AX = (atan2(XB, XA) * 180 / PI);
xangle = (int) ((AX + 180) * 10);
YA = (analogRead(2) - 512);
YB = (analogRead(3) - 512);
AY = (atan2(YB,YA) * 180 / PI);
yangle = (int) ((AY + 180) * 10);
}
TBH - I'm not sure my typecasting is right, plus I don't know if math.h is needed to be included for this to work - but the gist of it is there, I think...