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EPC101 Datasheet(PDF) 4 Page - Espros Photonics corp

Part No. EPC101
Description  Light-Curtain Device with 2-Wire Bus Interface
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Manufacturer  EPC [Espros Photonics corp]
Direct Link  http://www.espros.ch
Logo EPC - Espros Photonics corp

EPC101 Datasheet(HTML) 4 Page - Espros Photonics corp

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epc101
Overview Functional Description
Light Curtain – Transmitter
Figure 1 shows a typical schematic circuit of a light curtain emitter edge. A microcontroller manages the transmitters in the edge via an inter -
face chip (epc100) to the 2-wire power and communication bus. Since the LEDs draw a very high peak current when enabled, huge noise on
he 2-wire bus would interfere with the communication protocol on the bus. Thus, the LEDs are connected to a separate 2-wire power bus.
Part Name
Part No.
Designed
Approved
Scale
Page
<Text>
M 1:1
<Date>
DIN A3
<Partname>
<x000 000>
<Text>
File: Unbenannt
26.02.2009
1
<xx>
VDD33
IF
VDD
epc100
GND
SO
SCK
SI
CS
µC
GND
VDD µC
VDD
+ I
LED
- I
LED
PD
VDD33
VDD
epc101
GND
LED
T
n
VDD18
R
LED
C1
C2
PD
VDD33
VDD
epc101
GND
LED
T
2
VDD18
R
LED
C1
C2
PD
VDD33
VDD
epc101
GND
LED
T
1
VDD18
R
LED
C1
C2
Figure 1: Light curtain transmitter with up to 300mA pulse current through the LED
The feedback LED voltage to the PD input is to allocate the physical location of the transmitter node to the unique chip ID during production.
In this mode the the LED is used as a receiver. For configuration please refer to the Reference Manual epc10x.
In Figure 1, the LED current is defined by a common current source. The resistor RLED, which is typically 2.2 Ohms, is not needed in non-
safety applications. If this resistor is inserted, a failure mode will be detected if more than one LED is active due to a short circuit or a failure in
the epc101. It is also possible to have a common voltage supply and to control the LED current by a series resistor.
In order to allow a stable operation of the transmitter nodes, two voltage supply decoupling capacitors are needed: C1 should be of 100nF and
C2 4.7nF, both ceramic types.
For long range applications, a LED current of up to 1A is needed. Such a high pulse current can be achieved by using a darlington stage ac -
cording to Figure 2. Resistor RLED is typically 2.7 Ohms, resistor R approx. 1 kOhm. Possible transistors are for T1 BC846B and for T2 BC807-
40.
Part Name
Part No.
Designed
Approved
Scale
Page
<Text>
M 1:1
<Date>
DIN A3
<Partname>
<x000 000>
<Text>
File: Unbenannt
26.02.2009
1
<xx>
VDD33
IF
VDD
epc100
GND
SO
SCK
SI
CS
µC
GND
VDD µC
VDD
+ I
LED
- I
LED
VDD18
PD
VDD33
VDD
epc101
GND
LED
T
n
R
LED
R
T1
T2
C1
C2
VDD18
PD
VDD33
VDD
epc101
GND
LED
T
n
R
LED
R
T1
T2
C1
C2
VDD18
PD
VDD33
VDD
epc101
GND
LED
T
n
R
LED
R
T1
T2
C1
C2
VDD18
PD
VDD33
VDD
epc101
GND
LED
T
1
R
LED
R
T1
T2
C1
C2
VDD18
PD
VDD33
VDD
epc101
GND
LED
T
n
R
LED
R
T1
T2
C1
C2
VDD18
PD
VDD33
VDD
epc101
GND
LED
T
2
R
LED
R
T1
T2
C1
C2
Figure 2: Light curtain transmitter with more then 300mA pulse current through the LED
© 2011 ESPROS Photonics Corporation
Characteristics subject to change without notice
4
Datasheet epc101 - V2.1
www.espros.ch


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