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EPC112 Datasheet(PDF) 10 Page - Espros Photonics corp

Part No. EPC112
Description  Fully integrated standalone light barrier driver & receiver
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Maker  EPC [Espros Photonics corp]
Homepage  http://www.espros.ch
Logo EPC - Espros Photonics corp

EPC112 Datasheet(HTML) 10 Page - Espros Photonics corp

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epc111/112
High speed detection rate design
Figure 11 shows the epc 112 as an example in a high speed detection rate light barrier application with minimal part count. This design is
optimized for a fast reading of light beam interruptions. Whereas the working principle is similar to the above example. This driver circuit
operates with a VDDLED in a range of 6 to 20 VDC.
The epc112 device is designed to operate at 3.3V power supply (VDD and VDD33).
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File: Unbenannt
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
.
11.01.2011
Page 1
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OUTH
LED
OUTN
PD
VDD33
VDD
epc112
GND
VDD18
R2
13R
C1
10μF
Low ESR
GND
+3.3V
VDD
LED
= +12V
OUTH
OUTN
PD
epc300
R4
3k6
R3
10k
R1
47R
C3 100nF
C2 1μF
C5 4.7nF
C4 100nF
R5
12k
R7
10k
R6
4k7
Marked conductors must be short and low ohmic
IR LED
TSML1000
T1
BC846B
T2
BC846B
C2
The epc112 device with its very sensitive input PD needs a well decoupled power supply
Figure 11: High speed detection rate light barrier application with minimal part count
Notice:
The schematic is for illustrating the basic circuit idea only. For the real built up the designer has to take all other additional influence factors in
consideration too eg. design rules, power rating, heat dissipation, ...
Design Precautions: EMC shielding
The sensitivity at pin PD is very high in order to achieve a long operation range of light barriers even without
lenses in front of the IR LED and/or the photo diode. Thus, the pin PD is very sensitive to EMI. Special care
should be taken to keep the PCB track at pin PD as short as possible (a few mm only!). This track should be
kept away from the IR LED signal tracks and from other sources which may induce unwanted signals. It is
strongly recommended to cover the chip, the photodiode and all passive components around the chip with a
metal shield. A recommended part is shown in Figure 12. The pins at the bottom are to solder the shield to
the PCB with electrical connection to GND. The hole in the front is the opening window for the photo diode.
The backside of the PCB below the sensitive area (PD, epc111 or epc112) shall be a polygon connected to
GND to shield the circuit from the backside as well.
Ambient Light
Photodiode DC current can be generated by ambient light, e.g. sunlight. DC current at pin PD does not generate a DC output signal. However,
if IPDDC is above the stated maximal value, the input is saturated. This blocks the detection of AC current pulses.
Photodiode Capacitance
If the photo diode capacity is above the specified value, a lower detection sensitivity and a possible higher sensitivity spread results.
© 2011 ESPROS Photonics Corporation
Characteristics subject to change without notice
10
Datasheet epc111_112 - V2.2
www.espros.ch
Figure 12: Recommended EMC
shield


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