KAD/DSI/102 Discrete input (programmable counters, time tagging) - 24 channel

The KAD/DSI/102 monitors the status (high/low) of up to 24 differential-ended discrete input channels. Each of these has an assigned programmable 32-bit counter. Additionally each of the inputs can be used to trigger time tagged events. Each counter can be programmed to operate in one of the following modes: Period, Pulse Width, Duty Cycle, Frequency, Events Since Sample, Events Since Power Up, Events Since Reset, Samples Since Power Up, Samples Since Reset, or Time Since Event.

The range of each counter is programmable, as is the threshold (within ±28V), hysteresis (0.8 to 20V) and sensitivity to the rising/falling edge. All the channels control the time tagging to the 1K word deep FIFO (80 bits wide each word). For each input, time tagging can be triggered by a rising edge, falling edge, both edges, or neither (when the channel is disabled). Every time a trigger occurs, an 80-bit word is written to the FIFO consisting of the 24 inputs (configurable to be either input state after the change or value representing the bits which triggered the event) and the 48-bit binary coded decimal IRIG time that the event happened. There are also three FIFO flags which indicate that the FIFO is empty, that a message has been skipped, or that a message is stale. If a narrower input voltage range and hysteresis is required, contact us using the support tab below.

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Features

  • 24 differential-ended discrete bi-level input channels
  • 24 x 32-bit counters, each counter can be programmed to operate in one of ten different modes
  • 40 ns internal resolution
  • First In First Out (FIFO) based time tagging
  • Resettable counters
  • Independent channel programmability- Threshold- Hysteresis (for slow slew rate, high noise applications)- Falling/rising edge detection
  • Detection of 0.5µs wide input signal pulses

Applications

  • Engine speed measurement
  • Frequency, period, pulse width, duty cycle measurements
  • Data capture from a parallel bus
  • Time stamping of events
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