Low cost Isolated RS-485/RS-422 transceiver

The IL3022E low cost RS-485/RS422 isolated transceiver from NVE is designed to galvanically isolate bidirectional data communication over balanced transmission lines. The IL3022 series delivers at least 1.5V into a 27Ω load for excellent data integrity over long cables, and is also compatible with 3V input supplies, allowing interfacing to standard microcontrollers without additional level shifting. A unique ceramic/polymer composite barrier provides excellent isolation and virtually unlimited barrier life. This particular device uses NVE’s patented IsoLoop spintronic Giant Magnetoresistance (GMR) technology and comes in a 0.3″ 16-pin SOIC package.

• Low cost surface-mount RS-485/RS422 isolated transceiver
• Power supply V_DD1 3.3V to 5V, V_DD2 4.5V to 5.5V
• Data rate of 4Mbps
• Bus ESD protection of 7kV
• Isolation voltage of 2.5kV_RMS per UL 1577
• Working voltage of 600V_RMS per VDE V 0884-10
• Temperature range of −40°C to +85°C
• Typical common mode rejection 50kV/μs (30kV/μs minimum)
• Supports up to 32 nodes
• Thermal shutdown protection
• Typical propagation delay of 48ns (5V)
• UL 1577 recognised; VDE V 0884-10 certified
• 0.3″ 16-pin SOIC package

The IL3011E has current limiting and thermal shutdown features to protect against output short circuits and bus contentions that may cause excessive power dissipation, and also incorporate a “fail-safe if open” design, ensuring a logic high on R if the bus lines are disconnected or “floating.”

Typical applications for the IL3022 series include:

• Factory automation
• Industrial control networks
• Building environmental controls
• Equipment covered under IEC 61010-1 Edition 3
• 5kV_RMS rated IEC 60601-1 medical applications

The below table gives the recommended operating conditions for the NVE IL3022E isolated RS485/RS422 transciever: