I read about how PIR sensor works. It is written that it has two slots that convert IR energy to electrical voltage pulses. The working principle is to diff between the two slots and when the differentiation is not zero it is means that new object(human) has just entered the field of view (FOV).
If I am sitting and NOT moving in right edge of the FOV I assumed the diff will always gives non-zero at after the diff-amp and thus the sensor's output will be HIGH even if I am not moving. I try it but the sensor didn't signal HIGH. It doesn't matter if I am not-moving in the right edge nor the left edge.
My question is why? Why if I am constantly giving high energy to one part(slot) of the sensor it is not constantly trigger the alert?
Data sheet can be found here