RE46C114 View Datasheet(PDF) - Microchip Technology
Part Name
Description
Manufacturer
RE46C114 Datasheet PDF : 6 Pages
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RE46C114
Ionization Smoke Detector IC
Product Specification
R&E International
A Subsidiary of Microchip Technology Inc.
PIN DESCRIPTIONS
PIN 1 (VDD) - This pin should be connected to the most positive supply potential, typically a 9 Volt battery. The
VDD voltage can range between 6V and 12V with respect to VSS. Reverse battery protection must be provided
externally.
PIN 2 (VCC) – This positive supply potential can range between 2.7V and 5.5V with respect to VSS and must be
less than the VDD voltage. This pin is usually connected to a microprocessor positive supply voltage.
PIN 3 (SELECT) – This input pin determines the function of VOUT. This pin is typically driven by a
microprocessor port. The input high level should not exceed VCC. If left floating VOUT is inactive and pulled
internally to VSS. If SELECT is at the VIL (low) level then VOUT is nominally 1/2 of the VDD voltage. If SELECT
is at the VIH level (high) then VOUT is nominally 1/2 of the DETECT voltage.
PIN 4 (VSS) – This pin is the negative supply potential and is usually connected to ground.
PIN 5 (VOUT) – This analog output is a representation of VDD or DETECT or is at VSS depending on the status
of the SELECT input. Typically this output is connected to a microprocessor A to D input to monitor the status of
the supply voltage and the ionization chamber voltage.
PIN 6, 8 (G1, G2) – These pins are connected to the internal guard amplifier output and are within ±50mV of the
DETECT input. These outputs are always active and help to minimize surface leakage to the DETECT pin.
PIN 7 (DETECT) - This input is typically interfaced to an ionization chamber to sense the presence of smoke.
Input leakage is less than ±.75pA on this input.
© 2009 Microchip Technology Inc.
DS22162A-page 3
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