Interface Isolators (UART/RS232/RS485/CAN) with built-in Power | 🧨 Engineering Schematic Solutions
Intro
In this article I described issue with standard DC-DC isolated power modules which widely used for interfaces isolation also.
 | High Output Voltage on Isolated DC-DC Converter Modules | 🧨 Engineering Schematic Solutions |
Where isolation is used (examples)?
Board-to-board connections in Deye hybrid inverter:
LCD Board
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MCU Board
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Types
| DIGITAL ISOLATOR + INTERFACE + POWER ISOLATOR | INTERFACE ISOLATOR + POWER ISOLATOR | INTERFACE ISOLATOR WITH POWER |
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Let's take a looks at the real example and real components to understand how much space we can save.
More
| UART | RS-232 | RS-485 | CAN |
| CA-IS2631HA | ADM3251EARWZ-REEL | CA-IS2092A | CA-IS2062A |
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| LGA16 (4.65mm × 5.2mm) | SOIC-20-300mil | LGA16 (4.65mm × 5.2mm) | LGA16 (4.65mm × 5.2mm) |
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Aliexpress
 | CA-IS2092A ISO RS485 Transceiver Module |
 | 1PCS CA-IS2092A Isolated RS485/422 Transceiver Module High-Speed Data Communication Interface |
 | CA-IS2062A Screen printing 2062A 100% brand new and original |
PCB Example
| RS485 | CAN |
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EMI Compliant (Update 2026/09/15)
Use schematic wth additional ferrite beads from this document: EMI-Optimized Design for the CA-IS2092A Ultra-small, Isolated RS-485 Transceiver
Conclusions
| 🟢 | Modern IC offer very high integration just on one small package with reasonable price |