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EPC110 Datasheet(PDF) 7 Page - Espros Photonics corp |
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EPC110 Datasheet(HTML) 7 Page - Espros Photonics corp |
7 / 27 page epc110 Figure 4: Principle of controlled light barrier application using a micro-controller The photo diode current is compared to two threshold levels. The result OUTH from the higher comparison level may be used to detect the light reserve. Evaluation of a single light pulse The photodiode is operated against ground and is reverse biased at a constant voltage of 1.2V. The input impedance of pin PD is kept low (<1 kOhm @ 100kHz) in order to minimize the influence of the parasitic capacitance of the photodiode. To ensure proper operation under high ambient-light conditions, the photo diode DC current can be up to 2 mA. The resulting current from the light pulses are converted to a voltage, filtered, amplified and compared to two different threshold levels. The lower threshold SENSN (input related 60nA typical) is used for the detection of the signal, the higher threshold SENSH (input related to 96nA typical) is used to provide an output when a certain signal reserve is achieved. To detect the received light pulse properly, the given threshold must be at least five times higher than the rms value of the noise floor generated by the circuitry without AC light stimulation. The comparator results are digitally filtered and output at pin OUT and OUTH. The parameter TPER defines the scan period in the standalone light barrier application but has also an impact to the settling time of the receiver in the controlled mode application. It this case it has to be set corresponding to the scan period. Refer to the description of the TPER command. For each single light pulse, received and detected by the photodiode, the threshold levels for output OUTN and for output OUTH can be set by programming (parameter SENSN resp. SENSH). They are processed according to the following principle to propagate the output signals OUTN and OUTH resp. OUTNINT and OUTHINT. As far the received light pulse signal exceeds the corresponding threshold level, the pulse will be recognized as a valid pulse and the detection circuit sets the appropriate output signal OUTN INT or OUTHINT. Signal output OUTN Light reserve OUTH I PD Threshold levels: OUTN INT Light pulse detection Light reserve detection I PD OUTH INT t t t t t t Figure 5: Pulse evaluation © 2011 ESPROS Photonics Corporation Characteristics subject to change without notice 7 Datasheet epc110 - V2.1 www.espros.ch AN epc100 light curtain Transmitter LST VDD33 VDD epc100 GND OUTH PD OUTN EN LED GND VDD µC VDD OUT GND IN1 IN2 EN R Stab R LED OUT 11.02.2011 Page 1 File: This document is confidential and protected by law and international trades. It must not be shown to any third party nor be copied in any form without our written permission . C1 |
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