This design demonstrates the implementation of a buspowered RS-485 application and allows to evaluate different filters for the DC power. This saves the cost and space for a separate power wiring.
A new preferred approach by using On-off key modulation to transmit RS-485 signals over power line is achieved with THVD8000. By integrating modulation and demodulation circuits, the THVD8000 can increase the frequency content of the baseband data being transmitted. This enables easier DC and AC coupling and system-side interfaces to standard universal asynchronous receivers-transmitters (typically used for RS-485) without any need for special encoding, which is useful in low-data-rate applications. This upgraded approach works well for both DC and AC power without any need for special coding in a microcontroller.
A fully assembled board has been developed for testing and performance validation only, and is not available for sale.
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Reference design overview and verified performance test data
Detailed schematic diagram for design layout and components
Complete listing of design components, reference designators, and manufacturers/part numbers
Design file that contains information on physical board layer of design PCB
| Type | Title | Date | ||
|---|---|---|---|---|
| * | Design guide | RS-485 Power Over Bus Design Guide | May 15, 2015 |
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