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I'm designing a board for using the FLIR Lepton 2.0 LWIF camera (datasheet at https://www.flir.com/globalassets/imported-assets/document/lepton-engineering-datasheet---without-radiometry.pdf), and several of the pins are marked as unused. One is labeled as "No Connection" and four others as "RESERVED" (which is due to the fact that the Lepton 2.5, which uses the same case, has additional I/O pins). Given that I cannot set (and therefore do not know) the input/output state of these pins, and that they are likely disconnected internally, what should I do with them? My instinct is to connect them to ground through a pull-down resistor, but this may not be correct.

(As a side note, I'm using the Molex 105028-1001 socket for mounting this component.)

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Do not connect those pins to anything. If there would be a need or advantage to tying the pins a certain way, the data sheet would tell you so.

"Reserved" pins can have several meanings, including manufacturer testing, factory programming, or reservation for a future device that will be pin-compatible with this device. Whatever the purpose, it's not intended for end use. It may be an input, an output, bidirectional, or a special voltage. If the data sheet tells you to tie it high or low, it might be to disable factory functions, prevent an ambiguous state, or eliminate noise.

"No connection" means there is no actual circuit connected to the pin. It may or may not actually be connected to the die (e.g. to dissipate heat).

If the data sheet doesn't tell you what to do with the pin, leave a solder pad to help mechanically anchor the pin, but it should be otherwise unconnected.

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