| | | |  | One Wire, Many LEDs, and the Noise You Didn’t Plan For | | | Read this article on LinkedIn to join the conversation | Single‑wire ICLEDs rely on fast digital signals with sharp edges. Those signals don’t just stay on the data line; they create high‑frequency content that interacts with ground return paths, power traces, and any loops in the layout. Once that happens, both radiated and conducted emissions can increase, sometimes enough to cause compliance issues late in a project. A few clear patterns came out of the measurements: - Continuous ground planes are critical. Boards with a solid ground plane consistently showed the best EMC performance. When the ground plane was removed and replaced with return traces, emissions increased dramatically.
- Decoupling only works with the right return path. Even when every ICLED had its recommended capacitor, long or indirect ground paths reduced the benefit. Keeping current loops as small as possible made a noticeable difference.
- Ferrites help, but they’re not a replacement for good layout. Adding ferrites to the data line reduced emissions, but designs without a ground plane still struggled to maintain healthy margins.
- One PCB beats two. Placing the MCU and ICLEDs on the same board made it much easier to control emissions and immunity. The moment the system was split across two boards, noise levels climbed.
When the design has to be split In many real products, keeping everything on one PCB isn’t an option. LED panels or strips are often mounted away from the control electronics and connected by a cable. Testing showed that this setup increases both radiated and conducted emissions, sometimes by a large amount. ... | | | | | | | | This email was intended for KESAVAN .V (DFM Engineering at Sierra Circuits) | | Learn why we included this. | | You are receiving LinkedIn notification emails. Others can see that you are a subscriber. | | Unsubscribe · Help |  | | © 2026 LinkedIn Corporation, 1000 West Maude Avenue, Sunnyvale, CA 94085. LinkedIn and the LinkedIn logo are registered trademarks of LinkedIn. | | |
