 2010 Microchip Technology Inc.

DS22245A-page 3

RE46C162/163

Typical Applications

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.

6:

R8 should be at least 1.5K.

RE46C162 Typical Application – Temporal Horn Pattern

9V

Battery

+

-

1µF

C2

R1

8.2M

R2

390

R8

1.5K

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