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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  
Functional Description  
Light barrier applications  
To cover different aspects of applications the epc110 device can operate in various modes:  
1. Standalone mode  
The LED flashes in a predefined/programmed cycle time.  
2. Controlled mode together with a micro-controller  
The LED pulse starts on the positive edge of the input EN. The light is detected while the enable signal EN is high.  
3. Fix-parameter mode  
This is the use of a pre-programmed parameter setting all the time. Usually the programming takes place during configuration and  
test period of the board.  
4. Ambient adaptive reading by dynamic parameters  
In this mode the micro-controller is doing the parameter setting during the operation mode. For the communication the SPI interface  
is used. For more technical details refer to chapter “SPI Interface“.  
Application is for enhanced functionality and requirements as additional filtering of environmental ac light, adjustments of the  
sensitivity on the fly, controlling the LED current by micro-processor, etc. Example of a sensitivity control: The photo diode current is  
compared to two threshold levels. The result from the higher comparison ( OUTH) may be used to regulate the LED current as well  
the photodiode receiving parameters appropriate to the environmental conditions.  
Light barrier application without an additional controller  
RStab  
VDD  
VDD  
epc110  
VDD33  
RLED  
OUTN  
OUTH  
OUTN  
OUTH  
PD  
LED  
C1  
C2  
GND  
D2  
D1  
GND  
Figure 3: Principle of standalone light barrier application  
Figure 3 shows the epc110 in a light barrier application with minimal part count. The LED flashes with a predefined rate. If the current of the  
light reflected (e. g. from a diffuse reflecting object or a retro reflector) to the photo diode at pin PD exceeds the threshold val ue IPDN, the output  
OUTN goes to the low state for a time which is longer than the time to the next LED pulse. Thus, the signal at the pin OUTN is constantly low  
when the photo diode generates a photo current which exceeds the threshold level. The stored flashing parameters of the LED can be  
programmed using the SPI interface described in this manual.  
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.  
Light barrier application using a micro-controller  
If additional functionality is required in a specific application, a micro-controller can be used. Such additional requirements can be power  
saving modes, additional filtering of environmental ac light, counting purposes, etc. In this configuration, the LED emits one light pulse on the  
positive edge at the pin EN. The photo diode bias and amplifier chain is enabled while the enable signal EN is high so a light pulse can be  
detected.  
© 2011 ESPROS Photonics Corporation  
Characteristics subject to change without notice  
6
Datasheet epc110 - V2.1  
www.espros.ch  
 
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