RE46C144SW16F datasheet(8/26 Pages) MICROCHIP

Part #	RE46C144SW16F

Description	CMOS Photoelectric Smoke Detector ASIC with Interconnect and Timer Mode

PDF	26 Pages

Scroll/Zoom	100%

Manufacturer	MICROCHIP [Microchip Technology]

Direct Link	http://www.microchip.com

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8 / 26 page

RE46C144

DS22180C-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.

RE46C144SW16F Datasheet(PDF) 8 Page - Microchip Technology