The X-NUCLEO-ISO1A1 is an evaluation board with isolated industrial input/output designed to expand the STM32 Nucleo board and provide micro-PLC functionality.

Two of the X-NUCLEO-ISO1A1 boards can be stacked together on top of an STM32 Nucleo board with appropriate selection of jumpers on the expansion board to avoid conflict in GPIO interfaces.

The UL1577 certified digital isolators STISO620 and STISO621 provide isolation between logic and process side components.

Two current limited high-side inputs from the process side are realized through CLT03-2Q3.

The CLT03-2Q3 provides protection, isolation, and energy-less status indication for industrial conditions, designed to meet standards such as IEC61000-4-2, IEC61000-4-4, and IEC61000-4-5.

Each of high-side switches, IPS1025H-32 provides protected output up to 5.6A with diagnostics and smart driving features. These can drive capacitive, resistive, or inductive loads.

The X-NUCLEO-ISO1A1 allows rapid evaluation of the onboard ICs using the X-CUBE-ISO1 software package.

The board has provision for Arduino connections.

• 2x input equipped with CLT03-2Q3 high-speed protected digital termination array
• 2x output features IPS1025H and IPS1025H-32 high-efficiency, high-side switches with extended diagnostics and smart driving for capacitive loads
• Dual-channel digital isolators include 2x STISO621 isolators with two channels in opposite directions providing up to 6 kV galvanic isolation
• Dual-channel digital isolators include 2x STISO620 isolators offering up to 4 kV galvanic isolation
• LDO40LPURY: low drop regulator with wide input voltage range up to 38 V, 0.4 A output current, and adjustable output voltage from 2.5 V
• LEDs for each input and output, as well as for the power port
• Interfaces with STM32 Nucleo board via 34-pin ST morpho
• Free comprehensive development firmware library and examples compatible with STM32Cube firmware, X-CUBE-ISO1
• Two programmable LEDs for custom indications
• RoHS compliant