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EPC110 参数 Datasheet PDF下载

EPC110图片预览
型号: EPC110
PDF下载: 下载PDF文件 查看货源
内容描述: 完全集成的可配置的光障的驱动程序和接收器 [Fully integrated configurable light barrier driver & receiver]
分类和应用: 驱动
文件页数/大小: 27 页 / 588 K
品牌: EPC [ ESPROS PHOTONICS CORP ]
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epc110  
R
Stab  
VDD  
VDD  
epc100  
RLED  
VDD33  
VDD  
OUTN  
IN1  
IN2  
OUTH  
LED  
EN  
C1  
µC  
EN  
PD  
OUT  
GND  
GND  
OUT  
GND  
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  
.
IPD  
Light pulse detection  
IPD  
Light reserve detection  
Threshold levels:  
Light reserve OUTH  
Signal output OUTN  
t
t
t
t
t
t
OUTNINT  
OUTHINT  
Figure 5: Pulse evaluation  
© 2011 ESPROS Photonics Corporation  
Characteristics subject to change without notice  
7
Datasheet epc110 - V2.1  
www.espros.ch  
 
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