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I'm looking at this schematic for the TSL1401 line scan camera module and trying to understand what the various pins do. I understand what the labels SI, CLK, AO and Vdd mean but I'm totally lost when it comes to what the J1, J2 & J3 mean.

Here is a picture with the J labeled:

enter image description here

Can anyone here shine some light on this? I looked it up online and it seemed like it was a pretty standared term but I can't find any good documentation on it.

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J1, J2 and J3 are reference designators for connectors (or in some cases specifically pin headers).

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The "J" stands for "jumper", although the designator is also used for off-board connectors as well as jumper pins.

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    \$\begingroup\$ I use "J" for "jack" as well as for Jumper. \$\endgroup\$ – Peter Bennett May 31 '16 at 16:15
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    \$\begingroup\$ I actually see "J" used for "jack" more frequently than I see it used for "jumper". \$\endgroup\$ – DerStrom8 May 31 '16 at 17:27

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