On 11/30/13 11:13 AM, Grahame Marsh wrote:
I'm looking to pass a, i2c bidirectional data signal between two systems
that have about 2kV voltage difference between their respective
"grounds". I can find several device on, say, Mouser's website but I'm
getting lost with all the insulation terms. There is a variety of test
voltage conditions like "Vrms for 1 minute" and "galvantic isolation in
kV". These voltages are typically 4 - 6kV. But I also find "Maximum
working insulation VIORM 566 voltage" - so does this mean a normal
working voltage difference? And so well less than 2kV.
Sorry, but I need an idiot's (that's me) guide to what isolation voltage
I should be looking for to isolate these systems that live 2kV apart? I
know there are solutions that use multiple optoisolators and drivers but
I was looking for a single chip solution. Any helpers please?
(The application is between a microcontroller and the cathode circuit of
a CRT so it is almost on topic.)
Grahame
Grahame,
A quick Google search turned up this HP (Agavo) app note. It may or may
not help. There are amusing graphs of volts vs hours of lifetime. 2KV is
usually at 10 hours.
http://www.avagotech.com/docs/5989-0802EN
--
David Forbes, Tucson AZ
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