I am trying to build a wireless motion detector that can work on a battery for a really long time. I am using this PIR sensor: http://www.digikey.ca/product-detail/en/555-28027/555-28027-ND/1774435
When there is no motion, the sensor is drawing about 100uA, as specified in the data sheet. However, when it detects motion the current consumption jumps to about 3mA, which is completely unacceptable for my low power design. I don't know much about PIR sensors, but I don't think this is supposed to be happening. My guess is that all the extra current is being drawn to illuminate two tiny red LEDs that are built into the circuit board under the lens.
Does this sound like the right assessment? The sensor itself should not be drawing any extra current when it detects motion, whereas LEDs can easily consume 3mA of current, right?
If this is correct, then it appears that I will either need to somehow disable the LEDs on the PIR (any suggestions how?), or I'll need to use a different PIR sensor in my design.
Can someone recommend another PIR I should look into that would be in the same price range?
Would something like this be a good choice? http://www.digikey.ca/product-detail/en/AMN34111/255-2649-ND/1137326