RE46C145 View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

RE46C145

CMOS Photoelectric Smoke Detector ASIC with Interconnect and Timer Mode

Microchip Technology 

RE46C145

Functional Block Diagram

VDD (5)

VSEN (15)

Low Battery

+

-

+

-

Smoke Comparator

Logic and

Timing

DETECT (3)

C1 (1)

C2 (2)

STROBE (4)

TEST (16)

VSS (14)

V DD-3.5V

PHOTOAMP

+

-

V DD-5V

Bias and

Power Reset

Oscillator

Horn Driver

IO (7)

FEED (10)

HS (9)

HB (8)

LED (11)

IRED (6)

ROSC (13)

COSC (12)

Typical Application

9V

Battery

C3

1 μF

R3

RADJ1

8.2k

C1

.047 μF

R2

1

5k

C2

4700 pF

R4

2

560

RADJ2

R1

4.7k

D6

R5

3

250k

4

5

Q3

R6

D5

6

1k

C4

Smoke Chamber 100 μF

R7

22

7

8

To Other Units

R8

100

Push-to-Test

16

15

R12

D3

10M

14

C5

1.5nF

R9

13

100k

R13

12

330

11

10

C6

R11

9

1.0nF

220k

R10

1.5M

Note 1:

2:

3:

C3 should be located as close as possible to the device power pins.

C3 is typical for an alkaline battery. This capacitance should be increased to 4.7 µF or greater for a carbon battery.

R10, R11 and C6 are typical values and may be adjusted to maximize sound pressure.

DS22181C-page 2

 2009-2012 Microchip Technology Inc.

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