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EPC101 Datasheet(PDF) 4 Page - Espros Photonics corp |
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EPC101 Datasheet(HTML) 4 Page - Espros Photonics corp |
4 / 7 page 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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