STEVAL-FSM01M1 - dual-channel digital I/O module for STM32 Nucleo

Description

STMicroelectronics STEVAL-FSM01M1 dual-channel digital I/O module is designed as an expansion board for the development and evaluation of industrial control systems, including PLCs and functional safety applications. The board translates 3.3 V logic signals from the digital side into 0 / 24 V binary process signals, while maintaining galvanic isolation between the two domains. The board can operate with STM32 Nucleo through ST morpho connectors or as a standalone test board controlled by an external microcontroller or laboratory equipment. The STSW-FSM01 software package is designed for use with NUCLEO-F401RE and can be adapted to other STM32 Nucleo platforms. 

The input section uses the CLT03-2Q3 and provides two independent digital inputs compliant with IEC 61131-2 Type 1 and 3. The circuit supports test pulse generation for runtime integrity verification. The output section uses IPS160HF and IPS161HF intelligent high-side switches and P-channel MOSFETs in a redundant configuration. The output channels support nominal loads of 0.5 A and 2 A, while the IPS drivers provide overcurrent and overtemperature protection, diagnostics, and fast demagnetization of inductive loads. 

The board operates over a standard 8-30 V range, with optional configuration up to 60 V. Signal isolation is provided by digital isolators including the STISO621 with a data rate of 100 Mbps. The integrated 12-bit ADC120 with a sampling rate of 1 Msps enables real-time monitoring of the supply voltage and key nodes of both output channels via SPI. The design also includes reverse-polarity protection, TVS protection, and 1 kVRMS galvanic isolation. LEDs indicate the status and diagnostics of individual I/O channels, while two additional LEDs are available for user-defined indication. 

Features

• Basic information
  • Manufacturer: STMicroelectronics
  • Model: STEVAL-FSM01M1
  • Type: dual-channel digital input/output module
  • Application: industrial automation, PLCs, functional safety systems  
• Digital inputs
• • Number of digital inputs: 2
  • Input standard: IEC 61131-2 Type 1 and 3
  • Input IC: CLT03-2Q3
  • Test pulse support: yes  
• Digital outputs
  • Number of digital outputs: 2
  • OUT1 nominal current: 0,5 A
  • OUT2 nominal current: 2 A
  • Output ICs: IPS160HF, IPS161HF
  • Overcurrent protection: yes
  • Overtemperature protection: yes
  • Inductive load support: fast demagnetization
  • Channel diagnostics: yes  
• Power supply and protection
  • Operating voltage: 8-30 V
  • Optional voltage range: up to 60 V
  • Voltage regulators: L7983, LDK220
  • MOSFET: STL42P6LLF6
  • TVS protection: SMC30J36CA, SM6T33CA, SM2T3V3A
  • Reverse-polarity protection: yes  
• Interface and isolation
  • Interface logic level: 3.3 V
  • Galvanic isolation: 1 kVRMS
  • Digital isolator: STISO621, 100 Mbps
  • Expansion connectors: ST morpho
  • Hardware compatibility: STM32 Nucleo  
• Monitoring and diagnostics
  • ADC: ADC120
  • ADC resolution: 12-bit
  • ADC sampling rate: 1 Msps
  • ADC interface: SPI
  • Test points: yes
  • LED indication: I/O status and diagnostics, plus 2 user LEDs  
• Software and compliance
  • Compatible software: STSW-FSM01
  • Firmware reference platform: NUCLEO-F401RE
  • Compliance: CE, RoHS