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RE46C143 Datasheet

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R&E International
A Subsidiary of Microchip Technology Inc.
RE46C143
CMOS Photoelectric Smoke Detector ASIC with Interconnect
Product Specification
General Description
The RE46C143 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 8.1 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 40 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.
The RE46C143 is recognized by Underwriters
Laboratories for use in smoke detectors that comply
with specification UL217 and UL268.
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
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.
© 2009 Microchip Technology Inc.
Features
Internal Power On Reset
Low Quiescent Current Consumption
Available in 16L PDIP, 16L N SOIC or 16L W SOIC
ESD Protection on all Pins
Interconnect up to 40 Detectors
75% Duty Cycle Horn Pattern
Low Battery and Chamber Test
Compatible with Motorola MC145010
UL Recognized per File S24036
Available in Standard Packaging or RoHS
Compliant Pb Free Packaging.
Pin Configuration
1
C1
16
C2
2
15
DETECT
3
14
STROBE
4
13
5
12
VDD
6
11
IRED
IO
7
10
HORNB
8
SYMBOL
VALUE
V
12.5
DD
V
-.3 to V
+.3
in
dd
V
-10 to +22
infd
V
-.3 to +17
io1
I
10
in
T
-25 to 75
A
T
-55 to 125
STG
T
150
J
TEST
LBSET
VSS
ROSC
COSC
LE
D
FEED
9
HORNS
UNITS
V
V
V
V
mA
°C
°C
°C
DS22178B-page 1

Summary of Contents

Page 1

... RE46C143 CMOS Photoelectric Smoke Detector ASIC with Interconnect Product Specification General Description The RE46C143 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 ...

Page 2

... RE46C143 CMOS Photoelectric Smoke Detector ASIC with Interconnect Product Specification DC Electrical Characteristics -25° to 75°C, VDD9V, Typical Application (unless otherwise noted) Parameter Symbol Supply Voltage V DD Supply Current I DD1 I DD2 I DD3 I DD4 Input Voltage High V IH1 V IH2 V IH4 Input Voltage Low ...

Page 3

... RE46C143 CMOS Photoelectric Smoke Detector ASIC with Interconnect Product Specification DC Electrical Characteristics (continued) at TA -25° to 75°, VDD9V, Typical Application (unless otherwise noted) Parameter Symbol Output Voltage Low V OL1 V OL2 V OL3 Output Voltage High V Oh1 Output Current I IOH1 I IODMP Low Battery Alarm Voltage ...

Page 4

... RE46C143 CMOS Photoelectric Smoke Detector ASIC with Interconnect Product Specification AC Electrical Characteristics at TA -25° to 75°, VDD9V, VSS0V, Component Values from Figure 2 ; R9100KΩ, R1210MΩ, C5 1.5nF(unless otherwise noted) Parameter Symbol Oscillator Period T LED and STROBE On Time LED Period STROBE and IRED Pulse ...

Page 5

... RE46C143 CMOS Photoelectric Smoke Detector ASIC with Interconnect Product Specification © 2009 Microchip Technology Inc. Functional Block Diagram Figure 1 R&E International A Subsidiary of Microchip Technology Inc. DS22178B-page 5 ...

Page 6

... RE46C143 CMOS Photoelectric Smoke Detector ASIC with Interconnect Product Specification PIN# PIN NAME 1 C1 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. A1(C1/10) where pF. The gain should be < ...

Page 7

... RE46C143 CMOS Photoelectric Smoke Detector ASIC with Interconnect Product Specification Notes should be located as close as possible to the device power pins typical for an alkaline battery. This capacitance should be increased to 4.7uF or greater for a carbon battery. 3. R10, R11 and C6 are typical values and may be adjusted to maximize sound pressure. ...

Page 8

... RE46C143 CMOS Photoelectric Smoke Detector ASIC with Interconnect Product Specification CIRCUIT DESCRIPTION AND APPLICATION NOTES Note: All timing references are nominal. See electrical characteristics for limits. Standby Internal Timing With the external components specified in the typical application figure for ROSC and COSC the internal oscillator has a nominal period of 10mS ...

Page 9

... RE46C143 CMOS Photoelectric Smoke Detector ASIC with Interconnect Product Specification Low Battery and Chamber Test In standby an internal reference is compared to the voltage divided VDD supply. Low battery status is latched at the conclusion of the LED pulse. The horn will chirp for 10ms every 40 seconds until the low battery condition no longer exists ...

Page 10

... RE46C143 CMOS Photoelectric Smoke Detector ASIC with Interconnect Product Specification Oscillator PWOSC Internal Clock T ON1 STROBE IRED LED LED Low BatteryTest Low BatteryWarning Chirp Horn Chamber Test and Warning is Offset from Low Battery Test and Warning by 21.5 Seconds © 2009 Microchip Technology Inc. ...

Page 11

... RE46C143 CMOS Photoelectric Smoke Detector ASIC with Interconnect Product Specification STROBE IRED LED No Alarm Horn T IODLY1 IO as Output T IOFILT IO as Input Notes: 1. Smoke is not sampled when the horn is active. Horn cycle is self completing in local alarm. 2. Low battery warning chirp is suppressed in local or remote alarm 3. IO Dump active only in local alarm, inactive if external alarm © ...

Page 12

... RE46C143 CMOS Photoelectric Smoke Detector ASIC with Interconnect Product Specification Information contained in this publication applications and the like is provided only for your convenience and may be superseded by updates your responsibility to ensure that your application meets with your specifications. MICROCHIP MAKES NO REPRESENTATIONS OR WARRANTIES OF ANY ...

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