RE46C145S16F datasheet(8/26 Pages) MICROCHIP

Part #	RE46C145S16F

Description	CMOS Photoelectric Smoke Detector ASIC with Interconnect and Timer Mode

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Manufacturer	MICROCHIP [Microchip Technology]

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8 / 26 page

RE46C145

DS22181C-page 8

 2009-2012 Microchip Technology Inc.

2.9

Horn Feedback Pin (FEED)

Usually this pin is connected to the feedback electrode

through a current limiting resistor. If not used, this pin

must be connected to VDD or VSS.

2.10

LED Driver Pin (LED)

This pin is an open drain NMOS output used to drive a

visible LED.

2.11

Oscillator Capacitor Input (COSC)

A capacitor connected to this pin, with a parallel

resistor, sets the internal clock low time, which is

approximately the clock period.

2.12

Oscillator Resistor Drive Low

(ROSC)

A resistor between this pin and COSC pin sets the

internal clock high time. This also sets the IRED pulse

width (100 - 200 µs).

2.13

Hush Timer Sensitivity Pin (VSEN)

In Timer mode, this input pin can be used to set an

external smoke comparator reference.

2.14

TEST Pin

This input is used to invoke two test modes and the

Timer mode. This input has an internal pull-down.

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