Safeguard Your RS-485 Communication Networks from Harmful EMC Events
Analog Devices, Inc., and Bourns, Inc., have partnered to extend their offering of system oriented solutions by co-developing the industry's first EMC compliant RS-485 interface design tool that provides up to Level 4 protection levels for IEC61000-4-2 ESD, IEC61000-4-4 EFT, and IEC61000-4-5 surge. It gives designers the design options depending on the level of protection required and available budgets. These design tools allow designers to reduce risk of project slippage due to EMC problems by considering them at the start of the design cycle.
Key Features:
- Saves times and budget by allowing:
- Testing of the circuits at the beginning of the design cycle.
- Use of schematics and layout as a starting point in your design.
- Certified to protect ADI's ADM3485E, 3.3-V RS-485 transceiver for:
- 6-kV, 4-kV and 1-kV surge (IEC61000-4-5)
- 2-kV EFT (IEC61000-4-4)
- 15-kV air-discharge and 8-kV contact ESD (IEC61000-4-2)
Circuit description
The circuits shown below demonstrate proven and tested electromagnetic compatibility (EMC) compliant solutions for three protection levels for popular RS-485 communication ports using the ADM3485E transceiver.
Protection Scheme 1. TVS
Protection Scheme 2. TVS/TBU/TISP
Protection Scheme 3. TVS/TBU/GDT
Three EMC Compliant ADM3485E Protection Circuits (Simplified Schematic, All Connections Not Shown)
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