epc101

Light-Curtain Device with 2-Wire Bus Interface

General Description

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).

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.

Refer to the separate Data Sheet of the epc100 receiver chip and

to the Reference Manual epc10x for implementation, usage and

configuration information.

Feature



Light pulse transmitter



Universal LED controller



Scan period down to 30 µs



integrated clock generator



CSP10 package with very small footprint and standard QFN16 pack -

age available

Applications



Light barriers ranging from millimeters to tens of meters



Light curtains



Smoke detectors



Liquid detectors

Functional Block Diagram

Functional Block diagram epc70x

LST

Parameter

Memory

2-wire COM

Interface

2-wire COM

Interface

SO

SI

CS

VDD33

PD

03.11.2010

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.

LED

V

LED

VDD18

Signal

Processor

Processor

SPI

Controller

GND

VDD

LED

SCK

© 2011 ESPROS Photonics Corporation

Characteristics subject to change without notice

1

Datasheet epc101 - V2.1

www.espros.ch