RE46C190S16F datasheet(11/42 Pages) MICROCHIP

Part #	RE46C190S16F

Description	CMOS Low Voltage Photoelectric Smoke Detector ASIC with Interconnect and Timer Mode

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Manufacturer	MICROCHIP [Microchip Technology]

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 2010 Microchip Technology Inc.

DS22271A-page 11

RE46C190

2.0

PIN DESCRIPTIONS

The descriptions of the pins are listed in Table 2-1.

TABLE 2-1:

PIN FUNCTION TABLE

RE46C190

SOIC

Symbol

Function

1VSS

Connect to the negative supply voltage.

2

IRED

Provides a regulated and programmable pulsed current for the infrared emitter

diode.

3VDD

Connect to the positive supply or battery voltage.

4

TEST

This input is used to invoke Test modes and the Timer mode. This input has an

internal pull-down.

5

TEST2

Test input for test and programming modes. This input has an internal pull-down.

6

IRP

Connect to the anode of the photo diode.

7

IRN

Connect to the cathode of the photo diode.

8

RLED

Open drain NMOS output, used to drive a visible LED. This pin provides load current

for the low battery test, and is a visual indicator for Alarm and Hush modes.

9

GLED

Open drain NMOS output used to drive a visible LED to provide visual indication of

an Alarm Memory condition.

10

FEED

Usually connected to the feedback electrode through a current limiting resistor. If not

used, this pin must be connected to VDD or VSS.

11

IRCAP

Used to charge and monitor the IRED capacitor.

12

IO

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

single system. This pin has an internal pull-down device and a charge dump device.

13

HB

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

14

HS

This pin is a complementary output to HB, connected to the ceramic electrode of the

piezoelectric transducer.

15

VBST

Boosted voltage produced by DC-DC converter.

16

LX

Open drain NMOS output, used to drive the boost converter inductor. The inductor

should be connected from this pin to the positive supply through a low resistance

path.

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