IL485W
Application Information
Electromagnetic Compatibility
Dynamic Power Consumption
The IL485W is fully compliant with generic EMC standards
EN50081, EN50082-1 and the umbrella line-voltage standard for
Information Technology Equipment (ITE) EN61000. The
IsoLoop Isolator’s Wheatstone bridge configuration and
differential magnetic field signaling ensure excellent EMC
performance against all relevant standards. NVE conducted
compliance tests in the categories below:
IsoLoop Isolators achieve their low power consumption from the
way they transmit data across the isolation barrier. By detecting the
edge transitions of the input logic signal and converting these to
narrow current pulses, a magnetic field is created around the GMR
Wheatstone bridge. Depending on the direction of the magnetic
field, the bridge causes the output comparator to switch following
the input logic signal. Since the current pulses are narrow, about
2.5 ns, the power consumption is independent of mark-to-space
ratio and solely dependent on frequency. This has obvious
advantages over optocouplers, which have power consumption
heavily dependent on frequency and time.
EN50081-1
Residential, Commercial & Light Industrial
Methods EN55022, EN55014
EN50082-2: Industrial Environment
The approximate power supply current per channel is:
Methods EN61000-4-2 (ESD), EN61000-4-3 (Electromagnetic
Field Immunity), EN61000-4-4 (Electrical Transient Immunity),
EN61000-4-6 (RFI Immunity), EN61000-4-8 (Power Frequency
Magnetic Field Immunity), EN61000-4-9 (Pulsed Magnetic
Field), EN61000-4-10 (Damped Oscillatory Magnetic Field)
ENV50204
f
1
4
I
IN = 40 x
x
mA
fMAX
Where f = operating frequency
fMAX = 50 MHz
Radiated Field from Digital Telephones (Immunity
Test)
Immunity to external magnetic fields is even higher if
the field direction is “end-to-end” (rather than to
“pin-to-pin”) as shown in the diagram at right.
Power Supply Decoupling
Both VDD1 and VDD2 must be bypassed with 47 nF ceramic
capacitors. These should be placed as close as possible to VDD pins
for proper operation. Additionally, VDD2 should be bypassed with a
10 µF tantalum capacitor.
Application
PROFIBUS Fault Interrogation
IL485W
IL485W
6
NVE Corporation 11409 Valley View Road Eden Prairie, MN 55344-3617 USA Telephone: (952) 829-9217 Fax (952) 829-9189 Internet: www.isoloop.com
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