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| 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 W/mm2 Typ. l Digital output (Output appears "L" by light input.) l Small plastic package s Absolute maximum ratings (Ta=25 C) l Paper detection in office machines (copier, fax machines, etc.) l Photosensor switches 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 Unit V V mA mW C C - s Electrical and optical characteristics (Ta=25 C, Vcc=5 V) Parameter Supply voltage Current consumption 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 HL threshold light level Hysteresis Frequency response Symbol Vcc Icc VOL VOH TP1 TW1 TP2 TW2 EHL Hys f Condition Vo and cathode terminals are open IOL=16 mA 4.7 k between Vcc and Vo *2 *2 *4 *4 =940 nm, No background light *5 Min. 4.5 4.9 65 4 5 0.45 0.5 Typ. 4.0 0.2 130 8 0.2 0.65 1.25 Max. 16 11 0.4 220 13.7 50 1.0 0.85 - Unit V mA V V s s s s W/mm2 kHz lx Signal light: 5 W/mm p=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 Light modulation photo IC s Cathode terminal output voltage waveform 5V S4289-61 s Measurement circuit Vcc Vout CATHODE 10 kW 0.33 mF 5V 0V TW1 TP1 KPICC0035EA KPICC0036EA GND s Output terminal circuit Vcc s Spectral response (typical example) 100 (Ta=25 C) Vout GND RELATIVE SENSITIVITY (%) 80 60 KPICC0010EA 40 20 0 400 600 800 1000 1200 KPICB0002EA WAVELENGTH (nm) Light modulation photo IC S4289-61 s Block diagram and internal functions CONSTANT VOLTAGE CIRCUIT (a) Oscillator and timing signal generator 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. Vcc BUFFER PD PREAMP Vref COMPARATOR (b) Photodiode and preamplifier circuit 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. (c) Capacitive coupling, buffer amplifier and reference voltage generator 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. SIGNAL PROCESSING CIRCUIT Vout OUTPUT CIRCUIT (d) Comparator circuit The comparator circuit has a hysteresis function to prevent chattering caused by small fluctuations in the input light. CATHODE (LED) OSCILLATOR TIMING GENERATOR (e) Signal processing circuit The signal processing circuit consists of a digital integrator circuit that eliminates non-continuous, synchronous background light. GND (f) Output circuit This circuit serves as an output buffer for the signal processing circuit and outputs the signal to an external circuit. TRUTH TABLE INPUT LIGHT ON LIGHT OFF OUTPUT LEVEL LOW HIGH KPICC0040EA Note: The cathode (LED) terminal should be grounded. s 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 s Dimensional outline (unit: mm) 4.6 0.2 (INCLUDING BURR) 4.5 * 0.7 0.5 S4289-61 3.1 0.4 5.6 0.2 (INCLUDING BURR) CENTER OF ACTIVE AREA 5.4 * 2.54 10 1.0 PHOTOSENSITIVE SURFACE 0.7 0.15 2.0 5.75 0.2 5 CATHODE (LED) Vcc Vout GND (SHORT LEAD) 4.5 0.4 0.25 3 4.5 * 7.5 5 Tolerance unless otherwise noted: 0.1, 2 Shaded area indicates burr. Chip position accuracy with respect to the package dimensions marked * X0.2 Y0.2 KPICA0009EB 2.0 (DEPTH 0.15 MAX.) 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. (c)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: Smidesvagen 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 3 5.5 Cat. No. KPIC1044E01 Dec. 2000 DN |
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