WEBVTT
Kind: captions
Language: en

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♪ Been waitin' for the bus ♪

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Today we're demonstrating
the world's smallest

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isolated DC-DC convertor
and an isolated RS-485 / RS-422 transceiver

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with an integrated DC-DC convertor.

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We've set up an isolated
RS-485 network with two evaluation boards:

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the Master uses the IL4622 transceiver
with integrated DC-DC convertor;

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and the Slave has a separate
transceiver and DC-DC convertor.

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The boards are each connected
to a computer via an Arduino,

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and connected to each other via RS-485.

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The controller-side power is
supplied by the computers' USB ports.

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On this board we replaced the
Arduino five-volt regulator

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with a 3.3-volt regulator...

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and on this board we have

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a simple 3.3-volt buck regulator
from the USB power.

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A circuit like this can be combined
with our DC-DC convertor to make a

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5-to-3.3 volt DC-DC convertor.

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The DC-DC convertors generate the
isolated bus power,

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so we don't need separate
bus supplies, and they're

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efficient enough to run within
the 500 milliamp USB-2.0 limit.

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Data from the Master
is read by the Slave

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and sent back to the Master.

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The terminal monitors are set
to full duplex,

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so what appears on the left computer
has made a round trip

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through both transceivers
and some cable.

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We want the RS-485 isolated,
since the computers could be

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on different power lines,
and more than a kilometer apart,

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which would be really noisy
without isolation.

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Here are the Arduino programs
for the Master:

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and for the Slave:

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NVE transceivers work well
with standard RS-485 library routines.

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Key specifications for the
ILDC11 DC-DC convertor include:

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an ultraminiature 
3 by 5.5 millimeter DFN package;

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3.3-to-3.3-volt;

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quarter-watt output;

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it's fully regulated;

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full 2500 volts isolation;

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and 125 Celsius temperature range.

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IL4622 key specifications include:

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an integrated DC-DC convertor;

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a 40 Mbps transceiver;

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only one-fifth Unit Load;

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full 2500-volt isolation;

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and 16.5 kilovolt bus ESD protection.

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We have four evaluation boards
with DC-DC convertors,

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and none of them use "brick" supplies:

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We used these two in this demonstration:

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And here are the other things we used:

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Click, e-mail, or call us for more information,

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or to order these amazing parts

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or evaluation boards.