MT3922/3924

Digital I/O
MT3922/3924 - 3U up to 4 to 1 VGA/USB switch with digital I/O. The MT3922/3924 is standard 3U 8HP/12HP module gives the convenience of sharing up to 4 VGA/USB sources with one device. It is designed for very low cross-talk, low bit-to-bitskew, high channel-to-channel noise isolation and low I/O capacitance.
Key Features 
  • 12 HP 3U 4 to 1 VGA/USB switch for the MT3922
  • 8 HP 3U 2 to 1 VGA/USB switch for the MT3924
  • 12 digital inputs/outputs (24V)
  • 8 digital inputs/outputs (TTL)
  • 2 USB 2.0
The MT3922/3924 is standard 3U 8HP/12HP module gives the convenience of sharing up to 4 VGA/USB sources with one device. It is designed for very low cross-talk, low bit-to-bitskew, high channel-to-channel noise isolation and low I/O capacitance.

The VGA/USB available on DSUB connectors at front panel. 

The MT3922/3924 has 12 24V digital inputs isolated from the computer system by optocoupler galvanically. The inputs are also potential free to each other in groups of four inputs. A high performance of input circuit ensures a defined switching point and polarization protection against confusing the pole. All inputs have a common electronic debounce circuit with a debounce time freely programmable. 

 The MT3922/3924 has 12 digital high side switches with galvanic isolation from the computer system by optocoupler. 

The outputs are also isolated against each other in groups of four outputs. All outputs are protected against shortcircuit and thermal overload. The output drivers are capable of driving 0.5A per channel continuous. A hardware watchdog clears all outputs in case of trigger fail. 

The MT3922/3924 has 8 digital TTL inputs/outputs. Two USB 2.0 are placed on the board in addition. All I/O and two USB available on the J2 rear I/O connector.

Technical Data

I/O                           


  • VGA
    DSUB connectors at front panel
    RON: 5.5 W (typ)
    ESD human body model HBM Voltage: ±2KV for all I/Os
    Channel ON capacitance: 6pF (typ)
    Switching speed: 9ns
    Crosstalk: -32dB at 825MHz
  • USB
    Two USB to UART converters FT230
    Two USB 2.0 ports on the J2 rear I/O connector
    Five USB 2.0 switchable ports on DSUB connector at front panel
    Two USB 2.0 ports on the J2 rear I/O connector
  • 24 V signal voltage on the J2 rear I/O connector
    12 digital inputs/outputs
    Optocoupler for galvanic isolation
    All inputs isolated to each other in groups of four inputs
    Programmable electronic debounce circuit (7us to 440ms)
    Current per output 0.5A
    Outputs are short-circuit protected
    Outputs are isolated to each other in groups of four outputs
    Outputs protected against thermal overload
  • TTL-level signal voltage on the J2 rear I/O connector
    8 digital input/output
MCU

  • ATmega128
    8-bit AVR
    Operating Frequency: 16 MHz
    Flash: 128 Kbytes 
Miscellaneous 

  • CompactPCI® J1 connector are assembled for power supply
  • CompactPCI® J2  rear I/O connector for digital I/O
Electrical Specifications 

  • Supply voltage/power consumption:
    +5V (-3%/+5%), 8.5mA max.
    +3.3V (-3%/+5%), 250 mA max.  
Mechanical Specifications 

  • Dimensions: conforming to CompactPCI® specification for 3U 8HP/12HP boards
  • Weight: 200g 
Environmental Specifications

  • Temperature range (operation): -40..+85°C
  • Temperature range (storage): -40..+85°C
  • Relative humidity (operation): max. 95% non-condensing
  • Relative humidity (storage): max. 95% non-condensing
  • Altitude: -300m to + 3,000m
  • Shock: 15g/11ms
  • Bump: 10g/16ms
  • Vibration (sinusoidal): 2g/10..200Hz
  • Conformal coating on request
MTBF 
  • 300 000 h @ 40°C (derived from MIL-HDBK-217F)
Software Support
  • Windows® (Windows® XP, Windows® 7), Linux


Documentation

MT3922 3924- : 1.7