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CS235 - System Photoelectric Smoke Detector

Datasheet Summary

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 components, controls the system timing and signal processing.

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 performance. The internal latch is capable of sinking 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 tempora.

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Datasheet Details

Part number CS235
Manufacturer Cherry Semiconductor Corporation
File Size 147.46 KB
Description System Photoelectric Smoke Detector
Datasheet download datasheet CS235 Datasheet
Additional preview pages of the CS235 datasheet.

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Full PDF Text Transcription

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CS235 CS235 System Photoelectric Smoke Detector 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 components, 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 circuitry 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 sample rate increases to a two second interval.
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