RE46C122

CMOS Ionization Smoke Detector ASIC with

R&E International

Interconnect and Timer Mode

A Subsidiary of Microchip Technology Inc.

Product Specification

© 2009 Microchip Technology Inc.

DS22173A-page 6

Typical Application

Figure 2

Notes:

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.