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RE46C144 Schematic ( PDF Datasheet ) - R & E International

Teilenummer RE46C144
Beschreibung CMOS Photoelectric Smoke Detector ASIC
Hersteller R & E International
Logo R & E International Logo 




Gesamt 12 Seiten
RE46C144 Datasheet, Funktion
www.DataSheet4U.com
R&E International
RE46C144
CMOS Photoelectric Smoke Detector ASIC with Interconnect and Timer Mode
Product Specification
General Description
Features
The RE46C144 is low power CMOS photoelectric type
smoke detector IC. With minimal external components
this circuit will provide all the required features for a
photoelectric type smoke detector.
The design incorporates a gain selectable photo
amplifier for use with an infrared emitter/detector pair.
An internal oscillator strobes power to the smoke
detection circuitry for 100us every 10 seconds to keep
standby current to a minimum. If smoke is sensed the
detection rate is increased to verify an alarm condition.
A high gain mode is available for push button chamber
testing.
A check for a low battery condition and chamber
integrity is performed every 43 seconds when in
standby. The alarm horn pattern utilizes a 75% duty
cycle.
An interconnect pin allows multiple detectors to be
connected such that when one units alarms, all units
will sound.
An internal 10 minute timer can be used for a reduced
sensitivity mode.
Utilizing low power CMOS technology the RE46C144
was designed for use in smoke detectors that comply
with Underwriters Laboratory Specification UL217 and
UL268.
Internal Power On Reset
Low Quiescent Current Consumption
Available in 16L PDIP or 16L N SOIC
ESD Protection on all Pins
Interconnect up to 40 Detectors
10 Minute Timer for Sensitivity Control
75% Duty Cycle Horn Pattern
Internal Low Battery and Chamber Test
Compatible with Allegro A5358
Available in Standard Packaging or RoHS
Compliant Pb Free Packaging.
Pin Configuration
C1
C2
DETECT
STROBE
VDD
IRED
IO
HORNB
1
2
3
4
5
6
7
8
16 TEST
15 VSEN
14 VSS
13 ROSC
12 COSC
11 LED
10 FEED
9 HORNS
ABSOLUTE MAXIMUM RATINGS
PARAMETER
Supply Voltage
Input Voltage Range Except FEED, IO
FEED Input Voltage Range
IO Input Voltage Range
Input Current except FEED
Operating Temperature
Storage Temperature
Maximum Junction Temperature
SYMBOL
VDD
Vin
Vinfd
Vio1
Iin
TA
TSTG
TJ
VALUE
15
-.3 to Vdd +.3
-10 to +22
-.3 to 17
10
-25 to 75
-55 to 125
150
UNITS
V
V
V
V
mA
°C
°C
°C
Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are
stress ratings only and operation at these conditions for extended periods may affect device reliability.
This product utilizes CMOS technology with static protection; however proper ESD prevention procedures should be used when
handling this product. Damage can occur when exposed to extremely high static electrical charge.
Telephone 610.992.0727
Facsimile 610.992.0734
Page 1 of 12
DS-RE46C144-121806
This datasheet contains PROPRIETARY and CONFIDENTIAL information.






RE46C144 Datasheet, Funktion
RE46C144
CMOS Photoelectric Smoke Detector ASIC with Interconnect and Timer Mode
Preliminary Product Specification
R&E International
PIN#
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
PIN NAME
C1
C2
DETECT
STROBE
VDD
IRED
IO
HB
HS
FEED
LED
COSC
ROSC
VSS
VSEN
TEST
PIN DESCRIPTIONS
DESCRIPTION
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 a 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.
Telephone 610.992.0727
Facsimile 610.992.0734
Page 6 of 12
DS-RE46C144-121806
This datasheet contains PROPRIETARY and CONFIDENTIAL information.

6 Page









RE46C144 pdf, datenblatt
RE46C144
CMOS Photoelectric Smoke Detector ASIC with Interconnect and Timer Mode
Preliminary Product Specification
R&E International
R&E INTERNATIONAL, Inc. reserves the right to make changes without further notice to any products herein to improve reliability,
function or design.
R&E INTERNATIONAL, Inc. does not assume any liability arising out of the application or use of any product or circuit described
herein; neither does it convey any license under its patent rights, nor the rights of others.
R&E INTERNATIONAL, Inc. products are not authorized for use as critical components in life support devices or systems without the
express written approval of the President of R&E INTERNATIONAL, Inc. Life support devices or systems are devices or systems
which are intended for surgical implant into the body to support or sustain life, and whose failure to perform, when properly used in
accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. A
critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause
the failure of the life support device or system, or to affect its safety or effectiveness.
Telephone 610.992.0727
Facsimile 610.992.0734
Page 12 of 12
DS-RE46C144-121806
This datasheet contains PROPRIETARY and CONFIDENTIAL information.

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