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  The Smart Rock &mdash DN161
  PDF, 322 Kb, Datei veröffentlicht: Aug 1, 1997
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  The “Smart Rock”: A Micropower Transponder
  Design Note 161 Dale Eager
  INTRODUCTION
  A “smart rock” is a locating device that is buried at a specific
  site. It is interrogated by a portable source and responds
  with information about its position, identification number
  or any data that it has collected since its last interrogation.
  Ideally, a smart rock, once placed, will wait, listening for
  its interrogator, for many years, or even for decades. A
  smart rock buried on a nature trail might send its identification number to a traveler’s handheld transponder, which
  would decode the identification number and play a message
  describing the surrounding sights. It could also be used
  to direct the traveler which way to turn at a trail junction.
  Smart rocks are sometimes placed along the edges of
  cliffs so that interrogators built into vehicles, such as
  bulldozers, will cause them to stop before they get too
  close to the edge.
  THE MICROPOWER SUBCIRCUITS
  The Oscillator
  Figure 1 shows the LTC В® 1440 implementing a micropower
  oscillator. This circuit provides the references for both
  voltage and frequency needed in our rock; it draws only
  a few microamps of battery current. …

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• Interface > RS485/RS422 Transceivers

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LTC1480IN8PBF, LTC1480IN8 PBF