RE46C165T/S16TF データシートの表示（PDF） - Microchip Technology

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RE46C165T/S16TF

CMOS Photoelectric Smoke Detector ASIC with Interconnect, Timer Mode and Alarm Memory

Microchip Technology 

RE46C165/6/7/8

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.

When the horn is enabled, FEED drives the buffered

output HS pin and the complementary output HB pin.

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.

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.

DS22251A-page 12

 2010 Microchip Technology Inc.

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