RE46C140SW16TF Microchip Technology, RE46C140SW16TF Datasheet - Page 7

• Manufacturer Part Number: RE46C140SW16TF
• Description: Photoelectric Smoke Detector IC W/temporal, Timer 16 SOIC .300in T/R
• Manufacturer: Microchip Technology
• Type: Smoke Detectorr

Specifications of RE46C140SW16TF

• Input Type: Logic
• Output Type: Logic
• Interface: CMOS
• Current - Supply: 8µA
• Mounting Type: Surface Mount
• Package / Case: 16-SOIC (3.9mm Width)
• Product: Piezoelectric Horn Drivers
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

RE46C140
CMOS Photoelectric Smoke Detector ASIC with Interconnect
and Timer Mode
Product Specification
2009 © Microchip Technology Inc.
PIN#
10
11
12
13
14
15
16
1
2
3
4
5
6
7
8
9
PIN NAME
STROBE
DETECT
COSC
ROSC
VSEN
FEED
TEST
IRED
VDD
LED
VSS
HB
HS
C1
C2
IO
The capacitor connected to this pin sets the photo amplifier gain (high) for the
push-to-test and chamber sensitivity test. The size of this capacitor will depend
on the chamber background reflections. A=1+(C1/10) where C1 is in pF. The
gain should be <10000.
The capacitor connected to this pin sets the photo amplifier gain (normal) during
standby. The value of this capacitor will depend on the smoke sensitivity
required. A=1+(C2/10) where C2 is in pF.
Positive input to the photo amplifier. This input is normally connected to the
cathode of an external photo diode operated at zero bias.
Regulated output voltage of VDD-5 which is active during a test for smoke. This
output is the negative side of the photo amplifier circuitry.
Connect to the positive supply voltage
Provides a regulated pulsed output voltage pre-driver for the infrared emitter.
This output usually drives the base of an NPN transistor.
This bidirectional pin provides the capability to interconnect many detectors in a
single system. This pin has an internal pull-down device.
This pin is connected to the metal electrode of a piezoelectric transducer.
HS is a complementary output to HB and connects to the ceramic electrode of
the piezoelectric transducer.
Usually connected to the feedback electrode through a current limiting resistor. If
not used this pin must be connected to VDD or VSS.
Open drain NMOS output used to drive a visible LED.
A capacitor connected to this pin with parallel resistor sets the internal clock low
time which is approximately the clock period.
A resistor between this pin and pin 12 (COSC) sets the internal clock high time.
This also sets the IRED pulse width (100-200uS).
Connect to the negative supply voltage.
In the timer mode this input pin can be used to set an external smoke
comparator reference.
This input is used to invoke two test modes and the timer mode. This input has
an internal pull-down.
PIN DESCRIPTIONS
DESCRIPTION
A Subsidiary of Microchip Technology Inc.
R&E International
DS22179B-page 7