> http://ww1.microchip.com/downloads/en/AppNotes/00710c.pdf

AN710 is also part of this package

13.56MHz System Design Guide

http://ww1.microchip.com/downloads/en/devicedoc/21299e.pdf

A 13.56MHz chip like the MCRF450 needs about 130uA to write, and
20uA in normal mode, so that's some idea of what magnitude of power
transfer is required @ > 2.8V

125kHz System Design Guide

http://ww1.microchip.com/downloads/en/devicedoc/51115f.pdf

125kHz MCRF200 is 50uA write, 5uA normal

See also

http://en.wikipedia.org/wiki/Radio-frequency_identification#Miniaturization

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