A5358(1996) 查看數據表（PDF） - Allegro MicroSystems

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A5358
(Rev.:1996)

PHOTOELECTRIC SMOKE DETECTOR WITH INTERCONNECT AND TIMER

Allegro MicroSystems 

5358

PHOTOELECTRIC SMOKE DETECTOR

with INTERCONNECT and TIMER

PIN AND CIRCUIT DESCRIPTION, continued

The Diagnostic Test Mode is initiated by pulling this

pin below VSS and continuously sourcing 400 µA from the

pin for at least one clock cycle on the OSC. CAP. pin.

This mode is used to facilitate calibration and test of the IC

and the assembled detector. In this mode, certain device

pins are reconfigured as described below. In this mode,

the IRED pulse rate is increased to one every OSC. CAP.

cycle and the STROBE pin is always active. To exit this

mode, the test pin is floated for at least one OSC. CAP.

cycle.

Pin Name

HORN1

LED

Pin No. Configuration

8

This pin is reconfigured as the

smoke integrator output. Three

consecutive smoke detections

will cause this pin to go high

and three consecutive no-

smoke detections cause this

pin to go low.

11

This pin becomes a low-battery

indicator. The open-drain

NMOS output is normally OFF.

If VDD falls below the low-

battery threshold, the output

turns ON.

TYPICAL APPLICATION

VDD

CONNECT FOR TIMER MODE OR "HUSH" OPERATION

C1

1

C2 560Ω

2

PUSH

TO

TEST

16

15

CONNECT FOR

NON-TIMER MODE

OPERATION

+

9V

SMOKE

CHAMBER

200kΩ

1kΩ

+

100µF

3

4

5 VDD

6

7

8

VSS 14

OSC. &

TIMING

13

100kΩ

12

LOGIC

HORN

DRIVER

11

1000pF

10

9

220kΩ

TO/FROM

OTHER

UNITS

220Ω

Dwg. EC-006

115 Northeast Cutoff, Box 15036

Worcester, Massachusetts 01615-0036 (508) 853-5000

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