EPC110 Datasheet, PDF (21/27 Pages) Espros Photonics corp – Fully integrated configurable light barrier driver & receiver

epc110
Applications
Long range light barrier application (refer also to datasheet epc111)
Figure 18 shows the epc110 as an example in a long range light barrier application with minimal part count. The LED flashes according to the
description of the previous chapter. Light of the LED is passing either direct, reflecting from a reflecting object or a retro reflector to the photo
diode PD. If the received light fulfills the criteria according to the description in the previous chapter, the output signals OUTN and OUTH are
set.
LED Driver:
The output LED of the epc110 to drive the LED driver circuit is a current source capable to drive typically 1mA. For a high performance long
range light barrier (>8m), an LED peak current of up to 1.5A is needed. To generate such a high LED current, an external driver circuit is
necessary. The circuitry in Figure 18 is a simple implementation of such a driver circuit. The darlington circuit with T2 and T3 and R2 and R3
does the job. In order to avoid interference on the supply voltage, the supply is isolated (filtered) with R1 and C1. The high peak LED pulse
current is delivered by the capacitor C1, which itself is charged by R1. Make sure, that there is no coupling of the high LED current to the
ground of the epc110 or to the cathode of the photo diode. This driver circuit operates with a VDD LED in a range of 10 to 30 VDC.
C2 1μF
C3 100nF
+3.3V
C4 100nF
C5 4.7nF
PD
epc300
VDD
epc110
VDD33
VDD18
LED
PD
OUTN
OUTH
GND
VDD = +24V
LED
R4
R8
10k
10k
R6
IR LED
12k
TSML1000
R1
100R
R5
3k6
T1
BC846
R7
4k7
T2
BC846
T3
BCP56
R2
1k
R3
1R2
C1
47μF
Low ESR
GND
OUTN
OUTH
Marked conductors must be short and low ohmic
C2
The epc111 device with its very sensitive input PD needs a well decoupled power supply
Figure 18: Long range light barrier application with minimal part count
Notice:
The schematic is for illustrating the basic circuit idea only. For the real built up the designer has to take all other additional influence factors in
consideration too e.g. design rules, power rating, heat dissipation, ...
ROM RAM 15
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3 19
don't use
<⁴Titl²e⁰ >
don't use
5 21
don't use
File:
ddoonn''tt uussee _{This document}
is
6
confid₇ential
22
2^a3^nd
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
.
8 24
Lot no. LSB
9 25
Lot no. MSB
10 26
Chip ID
11 27
Factory use only
12 28
Revision no.
13 29
no function
14 30
no function
15 31
no function
1
1 FUSEBIT
0
0 FUSEBIT Application
1
1 FUSEBIT parameters
<name>^{FFUUSSEEBBIITT}
<xx> _FUSEBIT
Trimming
FUSEBIT
FUSEBIT Device Address
FUSEBIT
FUSEBIT
FUSEBIT
FUSEBIT
FUSEBIT
Chip ID
FUSEBIT
FUSEBIT
FUSEBIT
25.01.2011
Page 1
Figure 19: Corresponding memory map epc110 “Long range”
Parameter settings can be done by writing complete 16 bit registers only.
© 2011 ESPROS Photonics Corporation
21
Characteristics subject to change without notice
Datasheet epc110 - V2.1
www.espros.ch