PDF CS235GDWR18 Data sheet ( Hoja de datos )

Número de pieza	CS235GDWR18
Descripción	System Photoelectric Smoke Detector
Fabricantes	Cherry Semiconductor Corporation
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No Preview Available ! CS235 System Photoelectric Smoke Detector Description Features 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 INT OSC TIMER PGM PULSE LED BIAS PGM CAP RES WIDTH H.L. Gnd VR ICC VCC/ PGM OUT A1 IN (-) A1 IN (+) GATE POWER UP GATE BIAS A1 A2 MAIN TIMER CURRENT LIMITER OSCILLATOR LED DRIVER POWER UP BIAS CLOCK SET OUTPUT LATCH SYNC DETECTOR COMP COUNTER Ð¥¥3 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 18 Lead PDIP & SOIC Wide Timer Pulse Width 1 ICC Program 2 VCC /Output 3 Hi Level GND 4 A1 Input (-) 5 A1 Input (+) 6 LO Level GND 7 A2 Input 8 A2 Output 9 18 Timer Cap 17 Timer Period Program 16 V REG 15 LED Output 14 Oscillator Program 13 Internal Bias 12 NC 11 Detector Output 10 Detector Reference L.L. A2 GND IN A2 OUT NC DET DET OUT REF Rev. 7/6/98 1 Cherry Semiconductor Corporation 2000 South County Trail, East Greenwich, RI 02818 Tel: (401)885-3600 Fax: (401)885-5786 Email: [email protected] Web Site: www.cherry-semi.com A Company ¨ 1 page Application Diagram CS235 R8 36W Status LED IR LED PGnd 15 4 R9 270k 1nF C6 R12 150k 1nF R11 C7 150k R12 R13 150k 150k 5 6 LED Driver + A1 Gain =20 - + A2 - R6 18k 13 C3 6.8nF 14 Oscillator Synchronous Detector Gate Power UP Clock Main Timer Current Limit COMP CoÐ¥¥un3ter Output Latch R2 1 75k R1 17 20M C1 18 .47mF 16 C2 150mF 2 R7 12M 3 VCC/Output 8 9 11 10 R3 6k R4 510W C5 .47mF R5 100K C4 .47mF 7 LLGnd 5 5 Page

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Hoja de datos destacado

Número de pieza	Descripción	Fabricantes
CS235GDWR18	System Photoelectric Smoke Detector	Cherry Semiconductor Corporation

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