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    IL01x IL260 IL261 IL262 IL2985 IL3022 IL3085 IL3122 IL3185 IL3222 IL3285 IL3422 IL3485 IL3522 IL3585 IL3685 IL3685P IL41050TT IL41050TA IL41050TFD Series IL422
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    ACT001 DB001 DC001 DC002 ILDC1x
 
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Isolated PROFIBUS

NVE offers a unique PROFIBUS-compliant isolated RS-485 transceiver, the IL3685.

Extraordinary specifications include a 40 Mbps maximum data rate, up to 50 node fanout, and a 15 kV ESD rating for the bus nodes. The part provides transceiver and isolation functions in a single 0.3"-wide 16-pin SOIC package.

An illustrative PROFIBUS circuit is:
 
PROFIBUS Circuit


The 220 ohm termination resistor, along with another 220 ohm resistor and the other end of the bus, matches the bus impedance to minimize reflections. The 390 ohm "fail-safe" resistors guarantee a known state with no active transceivers. Bypass capacitors should be placed as close as possible to the appropriate IC.

 Isolated PROFIBUS Demonstration

PROFIBUS Evaluation Boards

 IL3685 product details

 IL3685 data sheet


Recommended application bulletins:

  AB-5: Isolated RS-485 and RS-422 (.pdf)
Dramatically reduce chip count and board area with IL400- and IL3000-Series single-chip isolated transceivers.
 
AB-6: RS-485 Systems (.pdf)
Practical tips and rules of thumb for making RS-485 systems work.
 
AB-19: PROFIBUS Compliance: A Hardware Design Guide (.pdf)
Hardware design best practices for Profibus DP nodes. Covers three important but sometimes tricky design considerations: isolation, Profibus compatibility, and bus node polarity.
 
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