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M31 - Mezzanine Card with 16 Digital Inputs, High-Side Switching


The M31 is an M-Module with 16 digital high-side switch inputs that connect or disconnect a load to ground. It is designed for industrial automation, medical computers, in-vehicle computers, and embedded computers in transportation.

  • M31 Product ImageM31 16 Binary Inputs
  • M31 Product Image

Main Features

  • 16 inputs 0 V to 155 V
  • Constant current inputs
  • Debouncing circuit
  • Interrupt generation
  • Load on ground
  • Optical isolation
  • -40 °C to +85 °C
M31 Product Image

Technical Data

Digital Inputs
  • Input load on ground
  • FET constant current source inputs
  • Input voltage: Logical low max. 1 V
  • Input voltage: Logical low min. 0 V
  • Input current: Logical low max. 0.2 mA
  • Input current: Logical low min. 0 mA
  • Input voltage: Logical high max. 40 V
  • Input voltage: Logical high max. 155 V (M-Module version for extended temperature range)
  • Input voltage: Logical high min. 5 V
  • Input current: Logical high max. 3.5 mA
  • Input current: Logical high min. 2.5 mA
  • Switching time for input change: 3µs typ.
  • Debouncing time: 14ms (defined by PLD programming)
  • Digital I/O
    • 16x digital input, isolated, D-Sub, 25-pin, receptacle
    • 16x digital input, isolated, board to board
  • M-Module
    • 1x A08/D16/INTA/INTB/IDENT, board to board
Product Standard
M-Module: ANSI/VITA 12-1997 (S2012)
Electrical Specifications
  • Supply voltage
    • +5 V (-3 % / +5 %)
  • Power consumption
    • 0.25 W typ.
  • Isolation voltage
    • 500 V DC between isolated side and digital side
    • Voltage between the connector shield and isolated ground is limited to 180 V using a varistor; AC coupling between connector shield and isolated ground through 47 nF capacitor
Mechanical Specifications
  • Dimensions standard: M-Module: (W) 149 mm, (D) 53 mm
  • Weight: 67.5g
Environmental Specifications
  • Operating temperature
    • 0 °C to +60 °C, or
    • -40 °C to +85 °C
    • Airflow: min. 10 m³/h
  • Storage temperature: -40 °C to +85 °C
  • Relative humidity range (operation): max. 95% non-condensing
  • Relative humidity range (storage): max. 95% non-condensing
  • Altitude: -300m to + 3,000m
  • Shock: 15g/11ms
  • Bump: 10g/16ms
  • Vibration (sinusoidal): 2g/10..150Hz
MTBF: 2 496 550 h predicted @ 40 °C according to IEC/TR 62380 (RDF 2000)
Flammability (PCBs)
  • UL 94 V-0
  • EN 55022 (radio disturbance)
  • IEC 61000-4-2 (ESD)
  • IEC 61000-4-4 (burst)
Software Support
  • Linux
  • Windows
  • VxWorks
  • QNX
  • For more information on supported operating system versions and drivers see Software.

Ordering Information

Standard M31 Models

16 binary sink inputs, 0..+60°C


16 binary sink inputs, -40..+85°C with qualified components

Miscellaneous Accessories

M-Module cable, 2 m, with 25-pin D-Sub plug/housing to pig tail


25 mounting screw sets to fix M-Modules on carrier boards (3 different screw types, 50 pieces each)



MDIS5 low-level driver sources (MEN) for M31, M32 and M82


MDIS5 System (and Device Driver) Package (MEN) for Linux. 
This software package includes most standard device drivers available from MEN.


MDIS5 Windows driver (MEN) for M31, M32 and M82


MDIS5 low-level driver sources (MEN) for M31, M32 and M82


MDIS5 System (and Device Driver) Package (MEN) for VxWorks. This software package includes most standard device drivers available from MEN.


MDIS5 low-level driver sources (MEN) for M31, M32 and M82


MDIS4 system (and device driver) package (MEN) for QNX, source code. This software package includes most standard device drivers available from MEN.

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