s4289-61 kpic1044e

PHOTO IC
Light modulation photo IC
S4289-61
Asynchronous type light modulation photo IC
S4289-61 is an asynchronous type light modulation photo IC designed for reliable detection even under disturbance background light. A
photodiode, preamplifier, comparator, oscillator and signal processing circuit, etc. are all integrated on a monolithic photo IC chip. Using
asynchronous optical detection means that no wiring to a signal light source (such as LED) is required and allows greater versatility in equipment
Features
Applications
l Asynchronous detection
l Large allowable background illuminance: 4000 lx Typ.
l Minimum detection level: 0.2 µW/mm2 Typ.
l Digital output (Output appears “L” by light input.)
l Small plastic package
l Paper detection in office machines (copier, fax machines, etc.)
l Photosensor switches
■ Absolute maximum ratings (Ta=25 °C)
Parameter
Symbol
Value
Vcc
-0.5 to +16
Supply voltage
Vo
-0.5 to +16
Output voltage
Io
50
Output current
P
250
Power dissipation *1
Topr
-25 to +60
Operating temperature
Tstg
-40 to +100
Storage temperature
230 °C, 5 s, at least 1.8 mm away from package surface
Soldering
*1: Derate power dissipation at a rate of 3.3 mW/°C above Ta=25 °C
■ Electrical and optical characteristics (Ta=25 °C, Vcc=5 V)
Parameter
Supply voltage
Symbol
Vcc
Current consumption
Icc
Vo and cathode terminals
are open
VOL
IOL=16 mA
Low level output
voltage
Output
High level output
voltage
Cathode Pulse cycle 1
output *3 Pulse width 1
Input signal Pulse cycle 2
light
Pulse width 2
VOH
TP1
TW1
TP2
TW2
H→L threshold light level
EHL
Hysteresis
Frequency response
Hys
f
Condition
4.7 kΩ between Vcc
and Vo
*2
*2
*4
*4
λ=940 nm,
No background light
*5
Min.
4.5
Typ.
-
Max.
16
Unit
V
-
4.0
11
mA
-
0.2
0.4
V
4.9
-
-
V
65
4
5
130
8
-
220
13.7
50
-
µs
µs
µs
µs
-
0.2
1.0
µW/mm2
0.45
0.5
0.65
1.25
0.85
-
kHz
Signal light: 5 µW/mm
λp=940 nm
Ex
2000
4000
Background light:
“A” light source
*2: Pulse cycle and pulse width of built-in LED driver circuit.
*3: Cathode terminal provides output for monitoring internal logic operation. When using it should be grounded.
*4: LED drive pulse cycle and pulse width of LED in an external circuit.
*5: Hysteresis Hys = (L → H threshold illuminance) / (H → L threshold illuminance)
Allowable background light
level
Unit
V
V
mA
mW
°C
°C
-
lx
Light modulation photo IC
■ Cathode terminal output voltage waveform
S4289-61
■ Measurement circuit
5V
Vcc
10 kW
Vout
0.33 mF
CATHODE
5V
0V
GND
TW1
TP1
KPICC0035EA
■ Output terminal circuit
KPICC0036EA
■ Spectral response (typical example)
(Ta=25 ˚C)
100
Vcc
GND
KPICC0010EA
RELATIVE SENSITIVITY (%)
Vout
80
60
40
20
0
400
600
800
1000
WAVELENGTH (nm)
1200
KPICB0002EA
Light modulation photo IC
■ Block diagram and internal functions
(a) Oscillator and timing signal generator
CONSTANT
VOLTAGE
CIRCUIT
Vcc
BUFFER
The photodiode is formed on the same monolithic chip. A photocurrent generated in the photodiode is converted to a voltage by
a preamplifier circuit. The preamplifier circuit uses an AC amplifier
to expand the dynamic range versus DC or low-frequency background light, without impairing signal detection sensitivity.
PREAMP
Vref
SIGNAL
PROCESSING
CIRCUIT
TIMING
GENERATOR
OSCILLATOR
The oscillator produces a reference oscillation output by charging and discharging the built-in capacitor with constant current.
The oscillation output is fed to the timing signal generator, which
then creates LED drive pulses and various timing pulses for
digital signal processing.
(b) Photodiode and preamplifier circuit
COMPARATOR
PD
S4289-61
(c) Capacitive coupling, buffer amplifier and reference voltage generator
Vout
OUTPUT
CIRCUIT
Capacitive coupling removes low-frequency noise and also cancels the DC offset in the preamplifier. The buffer amplifier boosts
the signal up to the comparator level, and the reference voltage
generator produces a comparator level voltage.
(d) Comparator circuit
The comparator circuit has a hysteresis function to prevent chattering caused by small fluctuations in the input light.
CATHODE
(LED)
(e) Signal processing circuit
GND
(f) Output circuit
The signal processing circuit consists of a digital integrator circuit
that eliminates non-continuous, synchronous background light.
This circuit serves as an output buffer for the signal processing
circuit and outputs the signal to an external circuit.
Note: The cathode (LED) terminal should be grounded.
TRUTH TABLE
INPUT
OUTPUT LEVEL
LIGHT ON
LOW
LIGHT OFF
HIGH
KPICC0040EA
■ Handling precautions
Synchronous mode acquires signals in synchronization with the LED emission timing. In asynchronous mode, a time window
is provided which opens at a certain cycle to acquire signals, and the LED frequency is set so that at least one signal enters the
time window while open. Since this time window for signal acquisition is wider when compared with synchronous mode
operation, the asynchronous mode is less capable of eliminating disturbance background light at high frequencies or in
pulsed form (noise light). However, asynchronous mode has the advantage of not requiring any wiring in order to synchronize
the LED with the photo IC.
S4289-61 exhibits the same characteristics as S7136 series light modulation photo IC except for synchronous detection. To
use S4289-61, the cathode (LED) terminal should be grounded and the LED operated by an external driver circuit.
Light modulation photo IC
S4289-61
■ Dimensional outline (unit: mm)
4.6 ± 0.2
(INCLUDING BURR)
3.1 ± 0.4
5.6 ± 0.2
(INCLUDING BURR)
5.5
3˚
10˚
2.54
5.4 *
0.7
CENTER OF
ACTIVE AREA
0.5
4.5 *
1.0
5˚
0.25
3˚
4.5 *
7.5 ± 5˚
2.0
CATHODE (LED)
Vcc
Vout
GND (SHORT LEAD)
4.5 ± 0.4
5.75 ± 0.2
0.7 ± 0.15
PHOTOSENSITIVE
SURFACE
2.0
(DEPTH 0.15 MAX.)
Tolerance unless otherwise
noted: ±0.1, ±2˚
Shaded area indicates burr.
Chip position accuracy
with respect to the package
dimensions marked *
X£±0.2
Y£±0.2
KPICA0009EB
Information furnished by HAMAMATSU is believed to be reliable. However, no responsibility is assumed for possible inaccuracies or omissions.
Specifications are subject to change without notice. No patent rights are granted to any of the circuits described herein. ©2000 Hamamatsu Photonics K.K.
HAMAMATSU PHOTONICS K.K., Solid State Division
1126-1 Ichino-cho, Higashi-ku, Hamamatsu City, 435-8558 Japan, Telephone: (81) 53-434-3311, Fax: (81) 53-434-5184, http://www.hamamatsu.com
U.S.A.: Hamamatsu Corporation: 360 Foothill Road, P.O.Box 6910, Bridgewater, N.J. 08807-0910, U.S.A., Telephone: (1) 908-231-0960, Fax: (1) 908-231-1218
Germany: Hamamatsu Photonics Deutschland GmbH: Arzbergerstr. 10, D-82211 Herrsching am Ammersee, Germany, Telephone: (49) 08152-3750, Fax: (49) 08152-2658
France: Hamamatsu Photonics France S.A.R.L.: 19, Rue du Saule Trapu, Parc du Moulin de Massy, 91882 Massy Cedex, France, Telephone: 33-(1) 69 53 71 00, Fax: 33-(1) 69 53 71 10
United Kingdom: Hamamatsu Photonics UK Limited: 2 Howard Court, 10 Tewin Road, Welwyn Garden City, Hertfordshire AL7 1BW, United Kingdom, Telephone: (44) 1707-294888, Fax: (44) 1707-325777
North Europe: Hamamatsu Photonics Norden AB: Smidesvägen 12, SE-171 41 Solna, Sweden, Telephone: (46) 8-509-031-00, Fax: (46) 8-509-031-01
Italy: Hamamatsu Photonics Italia S.R.L.: Strada della Moia, 1/E, 20020 Arese, (Milano), Italy, Telephone: (39) 02-935-81-733, Fax: (39) 02-935-81-741
Cat. No. KPIC1044E01
Dec. 2000 DN