Why do some cmos Imaging sensors have 48 pins and others 36 and some 34…e.c.t? I'm new to these sensors and I don't really understand the connectivity differences.
What determines the # of pins of a cmos Imaging sensor
cmosfloating-pinpinoutpins
Related Solutions
The answers are in the datasheet:
Points 3, 4 and 5 tell you what the pins do. INx are digital inputs for controlling motor direction. ENx are digital inputs for enabling each motor. The CS pins are for current monitoring purposes. There is a small resistor (e.g. 0.5 ohms in this case) between this pin and ground, so the current will be translated to a voltage at the CS pin (e.g. 1A * 0.5 ohms = 0.5V)
You can see the two large 3W, 0.5 ohm current sense resistors clearly in the picture below:
Here is an example from the L298 datasheet:
The quality isn't very good, sorry. Note this shows only 1/2 of the LM398. Hopefully you can see the resistor at the bottom left, with a tap off to "control circuit" (e.g. current can be controlled if desired, and monitored for overcurrent)
The truth table gives the same info as points 3, 4, 5. C and D equal IN1 and IN2 (or IN3, IN4 for the other half) Ven equals EN1 (or EN2..) and the pin with the resistor is CSA (or CSB)
Hope this all makes sense.
You might want to read about the Kepler spacecraft's CCD readout system. Monitoring thousands of stars at a time continuously, with 42 CCD chips, is just too much data. It doesn't take conventional 2D images but reads out only the CCD cells in areas of interest. Sounds sort of like what you're asking about.
Basic info http://kepler.nasa.gov/Mission/QuickGuide/MissionDesign/PhotometerAndSpacecraft/
More detailed technical info http://iopscience.iop.org/2041-8205/713/2/L87/fulltext/apjl_713_2_87.text.html
Plenty more is available online, in particular from NASA Ames and the SETI Institute.
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Best Answer
The design of the sensor and the interface really. Some are a parallel interface and could be 8,10,12 bit etc. It might include hsync and vsync or they might use embedded sync codes. Or it could be a serial interface and have only on lane or four or eight.
The configuration interface could be spi or i2c. One might have more powers and grounds than another etc.
So really it's sensor dependent although the interfaces are somewhat similar.