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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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CS235GDWR18 датащи(PDF) 1 Page - Cherry Semiconductor Corporation |
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CS235GDWR18 датащи(HTML) 1 Page - Cherry Semiconductor Corporation |
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1 / 6 page  Features GATE POWER UP GATE BIAS SET MAIN TIMER LED DRIVER OSCILLATOR CURRENT LIMITER OUTPUT LATCH COUNTER Ð3 ¥ ¥ CLOCK POWER UP BIAS COMP SYNC DETECTOR A2 A1 DET REF DET OUT NC A2 OUT A2 IN L.L. GND A1 IN (+) A1 IN (-) INT BIAS OSC PGM TIMER CAP PGM RES PULSE WIDTH LED H.L. Gnd V R I CC PGM V CC/ OUT s Synchronous Detection for High Noise Immunity s Pulsed Operation for Low Average Current Drain s System Gain Externally Set s System Sensitivity Externally Adjustable s System Operation Monitored by Means of External Red LED Package Options System Photoelectric Smoke Detector CS235 Description The CS235 System Smoke Detector is a photo electric type with a pulsed infrared LED as the light source and a silicon photodiode as the light detector. The CS235 IC, along with passive external compo- nents, controls the system timing and signal processing. Low average current is attained by pulsing the system once every 10 seconds for 20 milliseconds. Bias is applied to the signal processing cir- cuitry for this time interval. During the second half of the pulse, the last 10 milliseconds, the IR LED is pulsed and the unit samples for an alarm level smoke condition. After the first alarm level signal the sam- ple rate increases to a two second interval. After three consecutive alarm level samples the logic drives the output latch signalling the sys- tem panel. The signal processing circuit blocks are amplifiers A1 and A2, syn- chronous detector, voltage com- parator and the decode counter. The voltage gain of A2 and the comparator reference voltage are set by external resistors. Additional on-chip features include an ICC current limiter. The current limiter eliminates power-on false alarming. The oscillator controls the IR LED excitation frequency and provides drive to the synchronous detector. The synchronous detection method has very high noise rejection perfor- mance. The internal latch is capable of sink- ing 100 milliamps maximum and will clamp the VCC pin to 5 volts when tripped. The latch current is determined by an external resistor typically located in the master panel and is reset by temporary removal of detector power. Block Diagram 1 Timer Pulse Width 2 3 4 5 6 7 8 ICC Program VCC /Output Hi Level GND A1 Input (-) A1 Input (+) LO Level GND A2 Input 16 15 14 13 12 11 10 Timer Cap Timer Period Program V REG LED Output Oscillator Program Internal Bias NC Detector Output 9 A2 Output Detector Reference 17 18 18 Lead PDIP & SOIC Wide 1 A Company ¨ Rev. 7/6/98 Cherry Semiconductor Corporation 2000 South County Trail, East Greenwich, RI 02818 Tel: (401)885-3600 Fax: (401)885-5786 Email: info@cherry-semi.com Web Site: www.cherry-semi.com |
Аналогичный номер детали - CS235GDWR18 |
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Аналогичное описание - CS235GDWR18 |
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