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Add MAX31865

Matthijs Kooijman requested to merge github/fork/matthijskooijman/max31865 into master

This adds the MAX31865 RTD temperature sensor amplifier. Datasheet: https://datasheets.maximintegrated.com/en/ds/MAX31865.pdf

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This adds the SSOP and TQFN versions. They are mostly identical, except:

  • Pin numbering is different
  • TQFN has an exposed pad connected to GND (represented as a hidden stacked pin in the symbol).

There is one remaining checklib violation:

 - Pin SDO (14) @ (-700,200) is type TRISTATE : suggested OUTPUT

However, the SDO pin is a MISO pin that is tristated (to support multiple SPI devices), so TRISTATE is more appropriate.

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