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)
VDD33 VDD PROG
SCK
VDD
1 (9)
LED
SCK
8 (14)
V
LED
Interface
VDD33
9 (12)
Voltage Regulator
LED
Parameter
Memory
Processor
VDD18
10 (10)
SPI
Controller
Signal
Processor
PD
f
3 (6)
D1
2 (7)
4 (4)
7 (15)
6 (1)
5 (2)
GND
CS
EN
SI
OUTN OUTH
SO
Figure 1: Block Diagram
Configuration
standalone
controlled
Fix-parameter mode
epc110
“EN” --> epc110
Static parameters
Dynamic mode
µC
--> “SPI” --> epc110
µC
--> “SPI / EN” --> epc110
Ambient adaptive reading
Table 1: Configurations versus applications
Internal controlled light barrier read rate
External controlled light barrier read rate
Application
© 2011 ESPROS Photonics Corporation
Characteristics subject to change without notice
1
Datasheet epc110 - V2.1
www.espros.ch
EPC [ ESPROS PHOTONICS CORP ]
