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4 Discrete/Switch I/O Channels (±100 V, 3 A/Ch.)

The DT3 module (the enhanced version) feature 4 independent, high current, isolated, programmable channels that can be used for input voltage measurements (±100 V), or as a bi-directional current switch (up to 3 A per channel). When programmed as a switch with the switch closed, both the current through the switch and the voltage across the switch can be monitored. These modules include diode clamping on each channel. Clamping is useful for inductive loads, such as relays and short circuit protection.

  • Voltage Range: 100 VDC/Ch. max. (external supplied VCC source) Note: ±100 VDC is maximum when configured as “bridge type”
  • Resolution: 10-bits/channel for either output range
  • Mode Format: Programmable. Individual, Half or ‘H’ bridge control.
  • Output Current: 3.5 A per channel maximum; 7 A per channel maximum in factory configured ‘H’ bridge control only.
  • Output Impedance: < 0.1Ω
  • System Protection: Output is set to 0 at reset or Power-On.
  • Debounce: Programmable per channel from 0 to 366 ms (LSB= 20.48 μs; 16-bit resolution). (pending characterization)
  • Switching Frequency: Programmable 500 kHz maximum.
  • On-Resistance (RDS): 0.05 MΩ (x2) typical
  • Load: 3.5 A DC per channel maximum. Short circuit protected. When current exceeds 3.85 A for any channel, for > 50 ms, that channel is set “off” and a flag is set. All channels can be reset by either an automatic retry or by a control port command.
  • Voltage Measurement: User can read input voltage of each channel. Voltage: LSB=100 mV; Accuracy: The greater of ±10% of Source or ±3 LSB’s typical over temperature.
  • Current Measurement: User can read current of each channel. Current: LSB=100 mA; Accuracy: The greater of ±10% of Source or ±3 LSB’s typical over temperature.
  • Isolation: Module power returns (GND) and I/O to system ground is > 500 VDC.
  • Update Rate: Each channel command is updated every 20.48 µs.
  • Thermal Protection: Provided
  • Power: 5 VDC/TBD mA typical
  • Weight: 1.5 oz. (42 g)
Block Diagram

(Click diagram to enlarge)

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NAI’s Configurable Open Systems Architecture™ (COSA®) offers a choice of over 70 smart I/O, communication, and Ethernet switch functions, providing the highest packaging density and greatest flexibility of any multifunction I/O board in the industry. Preexisting, fully-tested functions can be combined quickly and easily in an unlimited number of ways. Each I/O function has dedicated processing, unburdening the system Single Board Computer (SBC) from unnecessary data management overhead.

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