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Addition of lots of LT RS22/485 Drivers

James Lucas requested to merge github/fork/jamesrlucas/add_LT_RS485_Drivers into master

Addition of RS422/485 Drivers from the following families:

LT1785/1791, LTC2850/2851/2852 & LTC2856/3857/2858

I've basically created a symbol for each package type within each family - to make it easier to add other parts as aliases in future. The symbol itself comes from ADUM1491EBR, with the pins in the same place to facilitate easy part swapping.

I've created all the variants listed in the datasheet (in terms of output type, package, and speed (in the case of LTC2856/7/8 parts)

image

All contributions to the kicad library must follow the KiCad library convention

Thanks for creating a pull request to contribute to the KiCad libraries! To speed up integration of your PR, please check the following items:

  • Provide a URL to a datasheet for the symbol(s) you are contributing
  • An example screenshot image is very helpful
  • Ensure that the associated footprints match the official footprint library
    • A new fitting footprint must be submitted if the library does not yet contain one.
  • If there are matching footprint PRs, provide link(s) as appropriate
  • Check the output of the Travis automated check scripts - fix any errors as required
  • Give a reason behind any intentional library convention rule violation.

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