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OCB100-KIT Datasheet(PDF) 6 Page - OPTEK Technologies |
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OCB100-KIT Datasheet(HTML) 6 Page - OPTEK Technologies |
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6 / 24 page  6 OCB100-KIT preset phototransistor output level is reached. At this time, the LED drive current is locked and maintained until the calibration pin is grounded. If for some reason the LED drive cur- rent reaches the maximum allowable value, a RED warning light will turn on. During the calibration process, remote monitoring of J1-Pin 5 allows the designer to ensure the system is calibrated (this output should be at the preset calibrated output level of 1/2 Vcc when the calibration procedure is completed). Adjusting the phototransistor load resistor may allow the system to calibrate properly. After the calibration process is complete, the device is ready for acknowledgement of a change in the signal. The design engineer can monitor either the Analog Output (J1-Pin 5) or Logical Output (J1-Pin 2 or J1-Pin 3). Connection of the analog ouput to additional circuitry allows the design engineer to set any reference point to recognize an optical change for the device being monitored. The Analog Output can be used with reflective devices to monitor small changes in the distance from the device. The Logical Output will change state once the preset optical light condition is reached. Logic Out A” (mating connector orange wire) switches when the optical output signal decreases below approxi- mately 1/3 of Vcc while “Logic Out B” (mating connector blue wire) switches when the optical output signal increases above approxi- mately 2/3 of Vcc. As with all optical devices with logic outputs, the switching condition is consistent with the phototransistor receiving a preset light level. |
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