M32
Mezzanine Card with 16 Digital Inputs, Low-Side Switching

Main Features
- 16 inputs 0 V to 24 V
- Constant current inputs
- Debouncing circuit
- Interrupt generation
- Load on supply voltage
- Optical isolation
16-Bit Digital Input M-Module
The mezzanine card M32 is a 16-bit digital input M-Module with latching capabilities for industrial applications. The inputs are optically isolated with a high isolation voltage of 500 V DC.
A current limit for each input guarantees an input voltage range of 0 V to 24 V.
Each input signal edge generates a maskable interrupt for each channel.
The signals of mechanical switches are debounced by a digital circuit with the precision debouncing time of 300 ns to 14 ms.
Low-Side Switching
The M32 has its input load on supply voltage which means that switching an input to ground activates the respective optocoupler.
Based on ANSI Standard
The M32 is based on the M-Module ANSI mezzanine standard. It can be used as an I/O extension in any type of bus system, i.e. CPCI, VME or on any type of stand-alone SBC.
Appropriate M-Module carrier cards in 3U, 6U and other formats are available from duagon or other manufacturers.
Reliable and Robust
The M32 can operate in a -40 °C to +85 °C temperature range, depending on the product model. The board withstands shock and vibration for reliable operation.
- Input voltage
- Logical low max.: 1 V
- Logical low min.: 0 V
- Logical high max.: 24 V
- Logical high min.: 5 V
- Input current
- Logical low max.: 0.2 mA
- Logical low min.: 0 mA
- Logical high max.: 3.5 mA
- Logical high min.: 2.5 mA
- Input type: Low-side switch (load to supply voltage)
- FET constant current source inputs
- Switching time for input change: 3 µs typ.
- Debouncing time: 14 ms (defined by PLD programming)
- Digital I/O
- 16 × digital input, isolated, D-Sub, 25-pin, receptacle
- 16 × digital input, isolated, board to board
- M-Module
- 1 × A08/D16/INTA/INTB/IDENT, board to board
- 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
- Dimensions: M-Module: (W) 149 mm, (D) 53 mm
- Weight: 67.5 g
- Operating temperature
- 0 °C to +60 °C
- Airflow: min. 10 m³/h
- Storage temperature: -40 °C to +85 °C
- Relative humidity (operation): max. 95% non-condensing
- Relative humidity (storage): max. 95% non-condensing
- Altitude: -300 m to +3000 m
- Shock: 15 g / 11 ms
- Bump: 10 g / 16 ms
- Vibration (sinusoidal): 2 g / 10 Hz to 150 Hz
- EN 55022 (radio disturbance)
- IEC 61000-4-2 (ESD)
- IEC 61000-4-4 (burst)
- Linux
- Windows
- VxWorks
- QNX