Honestly, I have a good deal of questions so this may not be for the faint of heart.
I will do my best to ask them in a logical order with specific language. I really appreciate the helpful answerers out there. My questions are related to many aspects of the whole device, so it might help a lot if you actually read the datasheet before and/or after reading my questions. I will assume you have read it when asking my questions, it will save a lot of space (save the trees, man) and time for reading this. Without further adieu...
Here is a link to the datasheet for the NCS36000 device.
- What would the possible purposes be of changing the oscillator frequency?
- Would using a voltage regulator to up the outputting VREF voltage (since my PIR sensor might need a higher in voltage) change the values of \$V_{h}\$ or \$V_{l}\$ such that it will ruin the mechanism used to 'detect' a signal from the PIR? Any other problems with this?
- What is a push/pull output as referenced at top of pg. 3? I am confused as to how this is the output for the device when \$V_{oh}\$ and \$V_{ol}\$ are not mentioned anywhere else.
- So am I correct when I say \$V_{ref}\$ powers the PIR, and the OUTPUT of the PIR (when it senses) goes to the
OP1_P
pin? How do the pins \$V_{ref}\$ and the OP pins relate? I am having trouble conceptualizing it from the datasheet alone. - On page 4 it says the LDO Regulator has a nominal voltage reference for the sensor of 2.7V +/-5%. What is my sensor needs 4 or 5Vdc to even power it?
- For the window comparator, why would
COMP_N
ever trigger? Why would the PIR sense something and spit out a low voltage instead of high? I know I can just use single pulse mode and either way would give identical signalings, but I'd like to understand as much as possible. - Is the
xLED_EN
pin active low? Looking at figure 6 the timing diagram at the LED pin sequence it says ifLED_EN = 0
(so it allows the LED pin to toggle when motion is detected) the LED goes from hi -> low. - Again, how do clock cycles come into play? I figure it is within this realm (last two questions-ish, but why might I change such a thing).
- Note 10 on page 7 says R4 can be replaced by a potentiometer to adjust system sensitivity, yet this is the only mention of sensitivity. What am I missing in regard to understanding the role R4 plays?