?2011 Microchip Technology Inc.
DS22275A-page 3
RE46C180
Typical Application
Note 1:  R3, R4 and C1 are typical values, and may be adjusted to maximize sound pressure.
2:   C2 should be located as close as possible to the device power pins.
3:   Route the pin 8 PC board trace away from pin 4 to avoid coupling.
4:   No internal reverse battery protection. External reverse battery protection circuitry required.
 
9V
Battery
+
-
1 礔
C2
R1
390
R5
100
To Other
Units
TEST and HUSH
R4
220K
R3
1.5M
C1
.001 礔
Rled
TEST
IO
GLED
CHAMBER
RLED
V
DD
TESTOUT
FEED
GUARD2
DETECT
GUARD1
T3
T2
HS
HB
V
SS
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Gled
R2
390
RE46C180
C3
10 礔
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