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  Low Cost isoSPI Coupling Circuitry for High Voltage High Capacity Battery Systems &mdash LT Journal
  PDF, 302 Kb, Datei veröffentlicht: Apr 9, 2014
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  Low Cost isoSPI Coupling Circuitry for High Voltage High
  Capacity Battery Systems
  Jon Munson The isoSPIв„ў feature built into the LTC6804 battery
  stack monitor, when combined with an LTC6820 isoSPI
  communications interface, enables safe and robust
  information transfer across a high voltage barrier. isoSPI is
  particularly useful in energy storage systems that produce
  hundreds of volts via series-connected cells, which require
  full dielectric isolation to minimize hazards to personnel.
  In a typical isoSPI application (Figure 1)
  pulse transformers provide the dielectric isolation and reject common-mode
  interference that can be impressed on
  the wiring. The isoSPI function operates
  with readily available and inexpensive
  Ethernet LAN magnetics, which typically
  include a common-mode-choke section (as shown in Figure 1) to improve
  common-mode line noise, along with the
  usual 100Ω line termination resistors and
  common-mode decoupling capacitors.
  Ordinary signal transformers, including
  Ethernet and gate-driver types, are wound with enameled wire that can have pin-hole
  sized insulation defects, which expose
  the copper to the atmosphere, inherently …

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• Interface > Isolated Transceivers > isoSPI Isolators
• Interface > Extended Temperature (H & MP) Interface

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LTC6820IUDTRPBF, LTC6820IUD TRPBF