RE46C146 查看數據表（PDF） - Microchip Technology

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RE46C146

CMOS Photoelectric Smoke Detector ASIC with Intelligent Interconnect and Timer Mode

Microchip Technology 

RE46C146

CMOS Photoelectric Smoke Detector ASIC with

Intelligent IO and Timer Mode

Product Specification

R&E International

A Subsidiary of Microchip Technology Inc.

PIN#

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

PIN NAME

C1

C2

DETECT

STROBE

VDD

IRED

IO

HB

HS

FEED

LED

COSC

ROSC

VSS

VSEN

TEST

PIN DESCRIPTIONS

DESCRIPTION

The capacitor connected to this pin sets the photo amplifier gain (high) for the

push-to-test and chamber sensitivity test. The size of this capacitor will depend

on the chamber background reflections. A=1+ (C1/10) where C1 is in pF. The

gain should be <10000.

The capacitor connected to this pin sets the photo amplifier gain (normal) during

standby. The value of this capacitor will depend on the smoke sensitivity

required. A=1+ (C2/10) where C2 is in pF.

Positive input to the photo amplifier. This input is normally connected to the

cathode of an external photo diode operated at zero bias.

Regulated output voltage of VDD-5 which is active during a test for smoke. This

output is the negative side of the photo amplifier circuitry.

Connect to the positive supply voltage

Provides a regulated pulsed output voltage pre-driver for the infrared emitter.

This output usually drives the base of an NPN transistor.

This bidirectional pin provides the capability to interconnect many detectors in a

single system. This pin has an internal pull-down device.

This pin is connected to the metal electrode of a piezoelectric transducer.

HS is a complementary output to HB and connects to the ceramic electrode of

the piezoelectric transducer.

Usually connected to the feedback electrode through a current limiting resistor. If

not used this pin must be connected to VDD or VSS.

Open drain NMOS output used to drive a visible LED.

A capacitor connected to this pin with a parallel resistor sets the internal clock

low time which is approximately the clock period.

A resistor between this pin and pin 12 (COSC) sets the internal clock high time.

This also sets the IRED pulse width (100-200uS).

Connect to the negative supply voltage.

In the timer mode this input pin can be used to set an external smoke

comparator reference.

This input is used to invoke two test modes and the timer mode. This input has

an internal pull-down.

© 2009 Microchip Technology Inc.

DS22176A-page 7

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