RE46C114
Ionization Smoke Detector IC
Product Specification
R&E International
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.
Telephone 610.992.0727
Page 3 of 5
E-mail: rande@randeint.com
DS-RE46C114-011207
This datasheet contains PROPRIETARY and CONFIDENTIAL information.
Facsimile 610.992.0734
RANDE [ R & E INTERNATIONAL, INC. ]
