RE46C162/163

DS22245A-page 4

 2010 Microchip Technology Inc.

Note 1:

Select R5 and R6 for the correct level to test the ion chamber. The voltage level on pin 1 (TSTART) must be

greater than the VIH level to initiate the timer. Pin 1 has an internal 180K nominal pull down which must be

considered.

2:

Select R9 to reduce sensitivity during the timer mode.

3:

R3, R4 and C1 are typical values and may be adjusted to maximize sound pressure.

4:

C2 should be located as close as possible to the device power pins.

5:

Route the pin 8 PC board trace away from pin 7 to avoid coupling.

RE46C162 Typical Application – 2/3 Duty Cycle Continuous Tone Horn Pattern

9V

Battery

+

-

1µF

C2

R1

8.2M

R2

390

R7

100

To Other

Units

R5

100K

TEST and HUSH

R6

68K

R9

R4

220K

R3

1.5M

C1

.001 µF

C3

.1 µF

Dled

1

2

14

15

16

9

3

4

6

7

8

5

11

10

12

13

TSTART

TONE

IO

LED

RBIAS

TSTROBE

FEED

GUARD2

GUARD1

DETECT

OSCAP

HS

HB

VSEN