EPC110 EPC [Espros Photonics corp], EPC110 Datasheet - Page 21

• Manufacturer Part Number: EPC110
• Description: Fully integrated configurable light barrier driver & receiver
• Manufacturer: EPC [Espros Photonics corp]

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
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, ...
Parameter settings can be done by writing complete 16 bit registers only.
© 2011 ESPROS Photonics Corporation
Characteristics subject to change without notice
ROM RAM
<Title>
10
11
12
13
14
15
0
1
2
3
4
5
6
7
8
9
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
15
1
0
0
14
PD
epc300
1
1
0
C2
C4 100nF
C5 4.7nF
13
0
1
0
Marked conductors must be short and low ohmic
The epc111 device with its very sensitive input PD needs a well decoupled power supply
C3 100nF
C2 1μF
Figure 18: Long range light barrier application with minimal part count
12
1
1
0
VDD33
VDD18
PD
Figure 19: Corresponding memory map epc110 “Long range”
epc110
+3.3V
11
VDD
1
1
1
GND
GND
OUTN
OUTH
10
0
0
0
LED
OUTN
9
0
0
1
Factory use only
R4
10k
Lot no. MSB
Revision no.
Lot no. LSB
no function
no function
no function
don't use
don't use
don't use
don't use
don't use
Chip ID
8
0
0
0
R5
3k6
21
7
0
0
1
R6
12k
R7
4k7
T1
BC846
6
0
0
0
OUTH
R8
10k
5
0
1
1
IR LED
TSML1000
T2
BC846
R2
1k
4
0
0
1
LED
.
in a range of 10 to 30 VDC.
T3
BCP56
R3
1R2
3
0
0
0
VDD
LED
2
1
0
1
= +24V
C1
47μF
Low ESR
R1
100R
<name>
<xx>
1
1
0
1
Datasheet epc110 - V2.1
FUSEBIT
FUSEBIT
FUSEBIT
FUSEBIT
FUSEBIT
FUSEBIT
FUSEBIT
FUSEBIT Device Address
FUSEBIT
FUSEBIT
FUSEBIT
FUSEBIT
FUSEBIT
FUSEBIT
FUSEBIT
FUSEBIT
0
www.espros.ch
epc110
parameters
Application
Trimming
Chip ID
25.01.2011
Page 1