RE46C190 데이터 시트보기 (PDF) - Microchip Technology

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RE46C190

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

Microchip Technology 

RE46C190

2.0 PIN DESCRIPTIONS

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

TABLE 2-1:

RE46C190

SOIC

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

PIN FUNCTION TABLE

Symbol

Function

VSS

IRED

VDD

TEST

TEST2

IRP

IRN

RLED

GLED

FEED

IRCAP

IO

HB

HS

VBST

LX

Connect to the negative supply voltage.

Provides a regulated and programmable pulsed current for the infrared emitter

diode.

Connect to the positive supply or battery voltage.

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

internal pull-down.

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

Connect to the anode of the photo diode.

Connect to the cathode of the photo diode.

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.

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

an Alarm Memory condition.

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

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

Used to charge and monitor the IRED capacitor.

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.

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

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

piezoelectric transducer.

Boosted voltage produced by DC-DC converter.

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.

 2010 Microchip Technology Inc.

DS22271A-page 11

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