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UM3483
User manual
Getting started with the X-NUCLEO-ISO1A1 industrial input/output expansion
board for STM32 Nucleo
Introduction
The
X-NUCLEO-ISO1A1
evaluation board is designed to expand the STM32 Nucleo board and provide micro-PLC functionality
with isolated industrial input and output. Isolation between logic and process side components is provided by the UL1577
certified digital isolators STISO620 and STISO621.
Two current-limited high-side inputs from the process side are realized through the CLT03-2Q3. Protected outputs with
diagnostics and smart driving features are provided by one each of the high-side switches IPS1025H/HQ and IPS1025H-32/
HQ-32 which can drive capacitive, resistive, or inductive loads up to 5.6 A.
Two
X-NUCLEO-ISO1A1
boards can be stacked together on top of an STM32 Nucleo board via ST morpho connectors with the
appropriate selection of jumpers on the expansion boards to avoid conflict in GPIO interfaces.
Rapid evaluation of the onboard ICs is facilitated by the
X-NUCLEO-ISO1A1
using the
X-CUBE-ISO1
software package.
®
Provision for ARDUINO
connections is provided on the board.
Figure 1.
X-NUCLEO-ISO1A1 expansion board
Notice:
For dedicated assistance, submit a request through our online support portal at www.st.com/support.
UM3483 - Rev 1 - May 2025
www.st.com
For further information, contact your local STMicroelectronics sales office.
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Summary of Contents for ST X-NUCLEO-ISO1A1
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Page 1: Figure 1. X-Nucleo-Iso1A1 Expansion Board
HQ-32 which can drive capacitive, resistive, or inductive loads up to 5.6 A. X-NUCLEO-ISO1A1 boards can be stacked together on top of an STM32 Nucleo board via ST morpho connectors with the appropriate selection of jumpers on the expansion boards to avoid conflict in GPIO interfaces. -
Page 2: Safety And Compliance Information
Both CLT03-2Q3 and IPS1025H are designed to meet common industrial requirements, including IEC61000-4-2, IEC61000-4-4, and IEC61000-4-5 standards. For a more detailed evaluation of these components, refer to the single-product evaluation boards available at www.st.com. The X-NUCLEO-ISO1A1 serves as an excellent tool for initial assessments and rapid prototyping, providing a robust platform for developing industrial applications with STM32 Nucleo boards. -
Page 3: Component Diagram
The different components on the board are shown here, with description. • U1 - CLT03-2Q3: Input current limiter • U2, U5 - STISO620: ST digital isolator unidirectional • U6, U7 - STISO621: ST digital isolator bidirectional. • U3 - IPS1025HQ-32: high-side switch (package: 48-VFQFN Exposed Pad) •... -
Page 4: Overview
The key features of the constituent components are given below. Dual-channel digital isolator The STISO620 and STISO621 are dual-channel digital isolators based on the ST thick oxide galvanic isolation technology. The devices provide two independent channels in the opposite direction (STISO621) and in the same direction... -
Page 5: High-Side Switches Ips1025H-32 And Ips1025Hq-32
The board is designed to meet application requirements in terms of galvanic isolation between user and power interfaces using ST’s new technology STISO620 and STISO621 ICs. This requirement is satisfied by a dual- channel digital isolator based on the ST thick oxide galvanic isolation technology. -
Page 6: High-Side Current Limiter Clt03-2Q3
UM3483 Overview High-side current limiter CLT03-2Q3 X-NUCLEO-ISO1A1 board has two input connectors for any industrial digital sensors, such as proximity, capacitive, optical, ultrasonic, and touch sensors. Two of the inputs are intended for isolated lines with opto- couplers on the outputs. Each input then feeds directly into one of the two independent channels in CLT03-2Q3 current limiters. -
Page 7: Figure 5. Output Operating Region Of Clt03-2Q3
UM3483 Overview Figure 5. Output operating region of CLT03-2Q3 UM3483 - Rev 1 page 7/31... -
Page 8: Functional Blocks
UM3483 Functional blocks Functional blocks The board is designed to operate with nominal 24V input which powers the process side circuitry. The logic component on the other side of isolators are powered by 5 V input to the X-NUCLEO board which is typically powered by a USB port of a PC. -
Page 9: Isolator Stiso621
UM3483 Functional blocks Isolator STISO621 The STISO621 digital isolator has 1-to-1 directionality, with 100MBPS data rate. It can withstand, 6KV galvanic isolation and high common-mode transient: >50 k V/μs. Figure 8. Isolator STISO621 Isolator STISO620 The STISO620 digital isolator has from 2-to-0 directionality, with 100MBPS data rate as the STISO621. It can withstand, 4KV galvanic isolation and has a Schmitt trigger input. -
Page 10: Current Limited Digital Input
UM3483 Functional blocks Current limited digital input The current limiter IC CLT03-2Q3 has two isolated channels, where we can connect isolated inputs. The board has an input excitation LED indicator. Figure 10. Current-limited digital input High-side switch (with dynamic current control) The high-side switches are available in two packages with identical features. -
Page 11: Jumper Setting Options
UM3483 Functional blocks Jumper setting options The control and status pins of the I/O devices are connected through jumpers to the MCU GPIO. The jumper selection allows connection of each control pin to one of two possible GPIOs. To simplify, these GPIOs are clubbed in two sets marked as default and alternate. -
Page 12: Figure 13. Mcu Interface Routing Options
UM3483 Functional blocks Figure 13. MCU interface routing options UM3483 - Rev 1 page 12/31... -
Page 13: Led Indicators
UM3483 Functional blocks LED indicators Two LEDs, D7 and D8 are provided on the board to have programmable LED indications. Refer to the software user manual for detailed information on various LED configurations and features, including power status and error states. -
Page 14: Board Setup And Configuration
UM3483 Board setup and configuration Board setup and configuration Get started with the board A detailed image is provided to help you become familiar with the board and its various connections. This image serves as a comprehensive visual guide, illustrating the layout and specific points of interest on the board. Terminal J1 is provided to connect 24V supply to power the process side of the board. -
Page 15: System Setup Requirements
2. NUCLEO-G071RB Board: The NUCLEO-G071RB board is a Nucleo development board. It serves as the main microcontroller unit for driving outputs, monitoring output health status, and fetching process side inputs. 3. X-NUCLEO-ISO1A1 Board: The Micro PLC board for evaluation of specific functionality of the devices. We can stack two X-NUCLEO as well. -
Page 16: Figure 16. Stack Of Two X-Nucleo Boards
UM3483 Board setup and configuration Default configuration Alternate configuration Serigraphy Schematic PIN feature Jumper Header on board name Header setting Name Name setting QA0_CNTRL_ 1-2(CN2- QA0_CNTRL_ 2-3(CN1- QA0_CNTRL_ QA.0 PIN-19) PIN-2) Output (IPS-1025) QA1_CNTRL_ QA1_CNTRL_ 2-3(CN1- QA1_CNTRL_ QA.1 1-2(CN1- PIN-1) PIN-10) 2-3(CN1- FLT1_QA0_L... -
Page 17: How To Set Up The Board (Tasks)
2. The FW is configure d for default jumper selection. appropriate modifications are needed to use alternate jumper selections. Figure 17. Jumper connection of X-NUCLEO-ISO1A1 1. Connect the Nucleo board via a micro-USB cable to the computer 2. Place the X-NUCLEO on top of Nucleo as shown in Figure 18 3. -
Page 18: Figure 18. Led Indication Pattern During Normal Board Operation
UM3483 How to set up the board (tasks) Figure 18. LED indication pattern during normal board operation UM3483 - Rev 1 page 18/31... -
Page 19: Schematic Diagrams
Schematic diagrams Figure 19. X-NUCLEO-ISO1A1 circuit schematic (1 of 4) TP10 Vout Sense P C Te s t P oint, 10UF Gre e n LED LDO40LPURY S M15T33CA Te rmina l Block 10UF 24V DC Input GND_EARTH EARTH Field Side Connections Figure 20. -
Page 20: Figure 21. X-Nucleo-Iso1A1 Circuit Schematic (3 Of 4)
Figure 21. X-NUCLEO-ISO1A1 circuit schematic (3 of 4) High side Switch Section Isolation Section VDD1 VDD2 QA0_CNTRL_P FLT1_QA0 FLT1_QA0_L 220K QA0_CNTRL_P QA0_CNTRL_L FLT2_QA0 FLT2 FLT1 FLT1_QA0 GND1 GND2 J 10 R28 220K 3 pin jumpe r S TIS O621 R29 220K GND_Logic QA.0... -
Page 21: Figure 22. X-Nucleo-Iso1A1 Circuit Schematic (4 Of 4)
Figure 22. X-NUCLEO-ISO1A1 circuit schematic (4 of 4) QA1_CNTRL_2 QA0_CNTRL_2 FLT2_QA0_2 FLT1_QA0_2 IA1_IN_1 QA1_CNTRL_1 AGND FLT1_QA0_1 FLT1_QA1_2 GND_Logic LOGIC_GND IA0_IN_1 QA0_CNTRL_1 FLT2_QA0_1 GND_Logic FLT2_QA1_1 GREEN LED RED LED AGND FLT2_QA1_2 IA1_IN_2 GND_Logic IA0_IN_2 FLT1_QA1_1 Le ft Ha nd S ide Conne ctor... -
Page 22: Bill Of Materials
UM3483 Bill of materials Bill of materials Table 2. X-NUCLEO-ISO1A1 bill of materials Item Q.ty Ref. Part/value Description Manufacturer Order code 10OHM Ferrite Beads WE-CBF Würth Elektronik 7427927310 Safety Capacitors C1, C3 4700pF Vishay VY1472M63Y5UQ63V0 4700pF Multilayer Ceramic C10, C11 0.47uF... - Page 23 UM3483 Bill of materials Item Q.ty Ref. Part/value Description Manufacturer Order code Thick Film Resistors - R12, R16 10KOHM Bourns CMP0603AFX-1002ELF Thick Film Resistors - 0Ohm Vishay CRCW06030000Z0EAHP Thin Film Resistors - 12KOHM Panasonic ERA-3VEB1202V Thin Film Chip R26, R27 150 OHM Vishay MCT06030C1500FP500...
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Page 24: Board Versions
UM3483 Board versions Board versions Table 3. X-NUCLEO-ISO1A1 versions Finished good Schematic diagrams Bill of materials X$NUCLEO-ISO1A1A X$NUCLEO-ISO1A1A schematic diagrams X$NUCLEO-ISOA1A bill of materials 1. This code identifies the X-NUCLEO-ISO1A1 evaluation board first version. UM3483 - Rev 1 page 24/31... -
Page 25: Regulatory Compliance Information
UM3483 Regulatory compliance information Regulatory compliance information Notice for US Federal Communication Commission (FCC) For evaluation only; not FCC approved for resale FCC NOTICE - This kit is designed to allow: (1) Product developers to evaluate electronic components, circuitry, or software associated with the kit to determine whether to incorporate such items in a finished product and (2) Software developers to write software applications for use with the end product. -
Page 26: Appendices
UM3483 Appendices An example is described here for the easy use and handling of the board. Example - Digital input and Digital Output test case 1. Stack the X-NUCLEO Board onto the Nucleo board 2. Debug the code using a Micro- B Cable 3. -
Page 27: Revision History
UM3483 Revision history Table 5. Document revision history Date Revision Changes 05-May-2025 Initial release. UM3483 - Rev 1 page 27/31... -
Page 28: Table Of Contents
UM3483 Contents Contents Safety and compliance information ..........2 Compliance information (Reference) . -
Page 29: List Of Tables
X-NUCLEO-ISO1A1 bill of materials ........ -
Page 30: List Of Figures
Jumper connection of X-NUCLEO-ISO1A1........ - Page 31 ST’s terms and conditions of sale in place at the time of order acknowledgment. Purchasers are solely responsible for the choice, selection, and use of ST products and ST assumes no liability for application assistance or the design of purchasers’...
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