epc100
Light-Curtain Device with 2-Wire Bus Interface
General Description
Feature
The epc10x chip set is a general purpose CMOS integrated circuit
for light-curtain applications. epc100 is used on the receiver side
(Rx) whereas epc 101 is on the emitter side (Tx). Up to 1023
devices may be connected to two respectively four wires in paral-
lel. Each device can be individually addressed by an epc100 chip
which acts as the interface between a microcontroller and the 2-
wire bus. It manages the bus traffic between the microcontroller
and the individual Rx and Tx elements. Programmable fuses i.e.
for the address, sensitivity, LED light pulse width, etc. allow the
device to be parametrized in the final system (OTP memory).
Light pulse receiver
Bus transceiver
Advantageous wiring by communication over the power-supply lines
High sensitive input for photo-diode current signals, typ. 60nA
Scan period down to 30 µs
integrated clock generator
CSP10 package with very small footprint and standard QFN16 pack -
age available
Applications
Each chip can be put into 'standby mode' or 'operating mode' to re-
duce power consumption. During 'standby mode', power consump-
tion is reduced and the photo diode is shorted.
Light barriers ranging from millimeters to tens of meters
Light curtains
Smoke detectors
Liquid detectors
Refer to the separate Data Sheet of the epc101 transmitter chip
and to the Reference Manual epc10x for implementation, usage
and configuration information.
Functional Block Diagram
VDD
2-wire COM
Interface
Parameter
Memory
VDD33
Processor
VDD18
PD
SPI
Signal
Controller
Processor
f
D1
CS
SI
GND
SO
SC
© 2011 ESPROS Photonics Corporation
Characteristics subject to change without notice
1
Datasheet epc100 - V2.1
www.espros.ch