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3U OpenVPX Multichannel Discrete I/O Board

The 68DT1 is a 3U OpenVPX™ board featuring up to 96-Channels of Standard Functionality (SF) DT1 module-type or Enhanced Functionality (EF) DT4  module-type Discrete I/O functions [optioned, factory configurable]. 48-Channels are dedicated as input (voltage or contact sensing with programmable, pull-up/pull-down current sources). An additional 24 or 48-Channels are programmable for either input or output (current source, sink, or push-pull) switching up to 500 mA per channel from an applied 3 – 60 V external VCC source (or sink to ISO-GND). The 68DT1 has the capability to sense broken input connections and whether an input is shorted to +VCC or to ground. Additional features of the DT4 EF are listed below. The 68DT1 offers unparalleled programming flexibility, a wide range of operating characteristics, and a unique design that eliminates the need for pull-up resistors or mechanical jumpers.

  • 3U OpenVPX Profiles: MOD3-PER-1U-16.3.3-2, SLT3-PER-1U-14.3.3
  • PCIe (x1)
  • 1x 10/100/1000 Base-T Ethernet
  • IMPC (option): VITA 46.11 Tier-2 compatible
  • Commercial or rugged applications
  • Operating temp: Commercial: 0 ºC to +70 ºC, Rugged: -40 ºC to +85 ºC
  • Conduction or air-cooled options: VITA 46/48/65 compliant, 4H, 0.8" Pitch
  • Power / Weight: 5V @ 1.5A (max.) (external Vcc not included), 1.25 lbs. (est.)
  • 48-Ch. programmable for: Input: voltage or contact sensing
  • 24-Ch. or 48-Ch. programmable for: Input: voltage or contact sensing, Output: current source, sink or push-pull (per channel/bank)
  • Application features and support: Current share, by connecting multiple channels in parallel, Handle high inrush current loads (for example, two #327 incandescent lamps in parallel), Dual channel "turn-on" (series channel output) applications (e.g. dual series "key" missile launch control), Ability to sense broken input connection and if input is shorted to +Vcc or to ground, Ability to read I/O voltage and output current (indicates if load is connected) 
  • 10 µs input timing resolution
  • Programmable input debounce circuitry (filter) with selectable time delay; eliminates false signals resulting from input relay contact bounce
  • Continuousd Built-In-Test (BIT)
  • Intelligent I/O library support included
  • (Optional) Enhanced (EF) Mode Operations: Input: Pulse Measurements, Transition Timestamps, Transition Counters, Period Measurement and Frequency Measurement, Output: PWM Output and Pattern Generator Output

68DT1 Function Specifications
Input Characteristics
Input Range: 0 to 60 VDC. Programmable for either voltage or switch closure sensing.
Overvoltage Surge Protection: 80 VDC max. (< 50 ms); 100 VDC max. (< 1 μs)
Voltage/Content Sensing: Software selectable per bank. When the input channel is utilized for direct voltage sense, VCC is not required. When input is used to detect switch closures, VCC is required to provide a current source (pull-up). VCC per channel bank must be between 3 VDC min. and 60 VDC max. (a virtual module has 4 VCC banks, each with 6 channels for a total of 24 channels/module).
Input Pulse Detection: A pulse of > 20 μs minimum width will be sensed and reported by the appropriate High–Low or Low-High transition status/interrupt.
Input Impedance: 1 MΩ (with or without power applied to module)
Switching Threshold: Four levels (Upper, Lower, Max High, Max Low ) are programmable from 0 to 60 VDC with 12-bit resolution
Voltage Measurement: User can read input voltage of each channel. From: LSB=100 mV; Accuracy: ±3 LSB’s (300 mV) over temp. To: 1% FSR
HIGH/LOW Differential (Hysteresis): 300 mV min. recommended. Programmable by using Upper & Lower thresholds.
Debounce: Programmable per channel from 0x00000000 (deactivated) to 0xFFFFFFFF (2^32 * 10μs) (LSB= 10 μs; 32-bit resolution).
Sample Rate: Each channel is updated every 10 μs.
[Optional] Enhanced Input Mode Operation: Pulse Measurements, Transition Timestamps, Transition Counters, Period Measurement and Frequency Measurement.
Output Characteristics
Output Formats: Low-Side (I sink), High-Side (I source) or Push-Pull (I source-sink); programmable per channel.
Output Voltage Range: 0 to 60 VDC. (Output voltage is defined by the user provided VCC applied to channel bank) Low-side drive does not require VCC. High-side and push-pull drive requires VCC.
Overvoltage Surge Protection: 80 VDC max. (< 50 ms); 100 VDC max. (< 1 μs)
Output current: 0.5 A maximum (28 V VCC typical) per channel. 2 A total per VCC bank (Note: VPX connectors may be limited). Measurement accuracy: ±10% ± 25 mA
Output Impedance: < 1 Ω (0.5 Ω typical)
Current Share Applications: Channels can be connected and operated in parallel to provide > 0.5A to act as a single channel. When current sharing, de-rate the per-channel maximum current output to at least 66% (or 333 mA/channel)
Overcurrent Protection: Low current (average): > 625 mA average over 3 ms.
High current (pulse): > 4 amps for less than or equal to 30 μs.
[Optional] Enhanced Output Mode Operation: PWM Output and Pattern Generator Output.


Block Diagram
9/6/2023 1:53:24 PM
9/6/2023 1:54:34 PM

The 68DT1 includes SSKs to support multiple operating systems. In addition, SSKs are supplied with source code and board-specific library I/O APIs to facilitate system integration.

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