NVE Sensor and Isolator News
    September 2011 Electrifying  News  From  NVE
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IL3585 Transceivers

Upcoming Exhibitions

Labor Savings

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Background Music
“Scotland the Brave” is our current telephone system background music, in honor of the SPE Exhibition in Scotland (see story at right).

Labor Day
Made in USA
NVE will be closed Monday, September 5 for Labor Day.
Featured Product
IL3585 Isolated Transceiver
IL3585 Functional DiagramThe IL3585 is NVE’s flagship transceiver—a galvanically isolated, high-speed differential bus transceiver, designed for bidirectional data communication on balanced transmission lines.

Patented IsoLoop spintronic Giant Magnetoresistance (GMR) technology makes these devices unique. On the input side, the IL3585 is compatible with 3.3 V input supplies, allowing interface to standard microcontrollers without additional level shifting. On the bus side, the IL3585 delivers an exceptional 2.3 V differential output into a 54 ohm load over a bus supply range of 4.5 V to 5.5 V. This provides better data integrity over longer cable lengths, even at data rates as high as 40 Mbps.

Current limiting and thermal shutdown features protect against output short circuits and bus contention that may cause excessive power dissipation. Receiver inputs feature a “fail-safe if open” design, ensuring a logic high R-output if A/B are floating.

  • 40 Mbps Data Rate
  • 5 ns Pulse Skew
  • 3.3 V / 5 V Input Supply
  • Low EMC Footprint
  • 15 kV bus ESD Protection
  • Thermal Shutdown Protection
  • Unlimited Barrier Life
  • Meets or Exceeds ANSI RS-485 and ISO 8482:1987(E)
  • UL1577 and IEC 61010-2001 Approved
  • 16-pin SOIC Package

  • Industrial Control and Factory Automation
  • Building Environmental Controls
  • Transportation Systems
  • Security Networks

<Download Datasheet>

<Illustrative Circuits>

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Upcoming Exhibitions
Offshore Europe
IsoLoop distributor Rhopoint Components
will be exhibiting at the SPE 2011 Offshore and Gas Exhibition, September 6 to 8 in Aberdeen, Scotland. NVE T-Series High-Temperature Isolators operate at 125°C with no derating, and have been proven in the toughest downhole requirements.
Labor Day Application Corner
Labor-Saving Single-Chip
Isolated Transceivers

Labor Day is the perfect time to reduce design and manufacturing labor with isolated transceivers.

Isolated serial interfaces are often required for safety, and can improve data reliability by eliminating ground loops.

Conventional opto-isolated RS-485 circuits need separate transceiver and isolator chips. A Schmitt trigger is also required to condition slow slew rate opto-isolator edges before the transceiver. These design considerations mean a high component count board:

Components for conventional circuit
High labor content with a conventional isolated RS-485 circuit.

Single-chip isolated RS-485 transceivers dramatically reduce chip count. As shown in the layout below, all that’s required are a isolated transceiver chip and two power supply decoupling capacitors:

IsoLoop single-chip isolated RS-485 transceiver
Isolated RS-485 chip cuts design and manufacturing labor.

Bus termination resistors can be added to maximize speed and transmission length by reducing reflections, although they may not be necessary. Fail-safe resistors can also be added to ensure a known bus state with no active transceivers.

For more tips on making RS-485 systems work, watch our new video:
Play Video ->
Play Video ->

Isolated transceivers are available in a variety of configurations, including RS-422, RS-485, RS-485W, and PROFIBUS, with various speeds, bus loads, and input types. Packages as small as 0.15"-wide SOICs are available.

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