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CMOS Ionization Smoke Detector ASIC with Interconnect,
R&E International
Timer Mode and Tone Select
A Subsidiary of Microchip Technology Inc.
Product Specification
Typical Application – 2 Buttons Operation, Temporal Horn Pattern
Figure 2
Notes for Application Drawing Figure 2:
Select R9 to reduce sensitivity during the timer mode.
R3, R4 and C1 are typical values and may be adjusted to maximize sound pressure.
C2 should be located as close as possible to the device power pins.
Route the pin 8 PC board trace away from pin 7 to avoid coupling.
If used R10 is 1.5K minimum
© 2009 Microchip Technology Inc.
DS22175A-page 7

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