epc110

Fully integrated configurable light barrier driver & receiver

General Description

The epc110 is a general purpose, fully integrated self-contained

CMOS circuit to be used in light-barrier applications.

The chip contains a controller which drives an LED, typically an IR-

LED. The LED is used in a pulsed mode to increase the signal-to-

noise ratio even when there is very strong sunlight biasing the photo

diode.

It contains also a high sensitive photo diode amplifier and a signal

conditioning circuitry to cancel unwanted environmental light including

strong sunlight and pulsed light sources. The receiver is built around a

synchronous demodulator circuitry. Two output signals with different

threshold levels are implemented in order to trigger the light barrier

output or to indicate light reserve.

The chip also includes a power supply circuitry to establish all

internally required voltages from one source only.

It can be used either as a standalone device, forming the whole core

of an industrial light barrier. It can also be used together with a micro-

controller (

µC) for more advance applications.

Features



Fully integrated light barrier chip



Needs just a photo diode and a LED with a LED driver



Customer configurable version

for i.e. high sensitivity or high speed applica tions



Integrated clock generator



CSP10 package with very small footprint

or standard QFN16 package available

Applications



Light barriers ranging from millimeters to tens of meters



Smoke detectors



Liquid detectors

Functional Block Diagram

for 10-Pin Chip Scale Package (for 16-pin QFN Package)

Functional Block diagram epc70x

LST

OUTH

Parameter

Memory

Interface

OUTN

SO

VDD33

PD

03.02.2011

Page 1

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

.

LED

D1

V

LED

f

VDD18

Signal

Processor

Processor

SPI

Controller

GND

VDD

LED

SCK

9 (12)

10 (10)

7 (15)

4 (4)

1 (9)

VDD33

2 (7)

8 (14)

3 (6)

5 (2)

6 (1)

EN

SI

CS

VDD PROG

SCK

Figure 1: Block Diagram

Configuration

Fix-parameter mode

Dynamic mode

standalone

epc110

µC --> “SPI” --> epc110

Internal controlled light barrier read rate

controlled

“EN” --> epc110

µC --> “SPI / EN” --> epc110

External controlled light barrier read rate

Static parameters

Ambient adaptive reading

Application

Table 1: Configurations versus applications

© 2011 ESPROS Photonics Corporation

Characteristics subject to change without notice

1

Datasheet epc110 - V2.1

www.espros.ch