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RE46C128 Datasheet

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R&E International
A Subsidiary of Microchip Technology Inc.
RE46C128
CMOS Ionization Smoke Detector ASIC with Interconnect
Product Specification
General Description
The RE46C128 is low power CMOS ionization type
smoke detector IC. With few external components this
circuit will provide all the required features for an
ionization type smoke detector.
An internal oscillator strobes power to the smoke
detection circuitry for 10.5mS every 1.66 seconds to
keep standby current to a minimum. A check for a low
battery condition is performed every 40 seconds when
in standby. The temporal horn pattern supports the
NFPA 72 emergency evacuation signal.
An interconnect pin allows multiple detectors to be
connected such that when one units alarms all units will
sound.
Although this device was designed for smoke detection
utilizing an ionization chamber it could be used in a
variety of security applications.
The RE46C128 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
Reverse Battery Time
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
>1500V ESD Protection (HBM) on all Pins
Guard Outputs for Ion Detector Input
+/-0.75pA Detect Input Current
Internal Reverse Battery Protection
Low Quiescent Current Consumption (<6.5uA)
Available in 16L PDIP or 16L N SOIC
Internal Low Battery Detection
Power Up Low Battery Test
Interconnect up to 40 Detectors
Compatible with Allegro A5364
UL Recognized per File S24036
Available in Standard Packaging or RoHS
Compliant Pb Free Packaging.
Pin Configuration
1
N/C
16
IO
2
15
LBADJ
3
14
N/C
4
13
5
12
LED
6
11
VDD
RBIAS
7
10
8
FEED
SYMBOL
VALUE
V
15
DD
V
-.3 to V
+.3
in
dd
V
-10 to +22
infd
V
-.3 to 17
io1
T
5
RB
I
10
in
T
-10 to 60
A
T
-55 to 125
STG
T
150
J
GUARD2
DETECT
GUARD1
VSEN
OSCAP
HS
HB
9
VSS
UNITS
V
V
V
V
S
mA
°C
°C
°C
DS22171B-page 1

Summary of Contents

Page 1

... RE46C128 CMOS Ionization Smoke Detector ASIC with Interconnect Product Specification General Description The RE46C128 is low power CMOS ionization type smoke detector IC. With few external components this circuit will provide all the required features for an ionization type smoke detector. An internal oscillator strobes power to the smoke detection circuitry for 10 ...

Page 2

... RE46C128 CMOS Ionization Smoke Detector ASIC with Interconnect Product Specification DC Electrical Characteristics 25°C, VDD9V, OSCAP.1uF, RBIAS8.2MΩ, VSS0V (unless otherwise noted) Parameter Symbol Supply Voltage V Supply Current I I Input Voltage High V V Input Voltage Low V V Input Leakage Low ...

Page 3

... RE46C128 CMOS Ionization Smoke Detector ASIC with Interconnect Product Specification DC Electrical Characteristics Continued Parameter Symbol Offset Voltage Common Mode Voltage V V Output Impedance Z Hysteresis V Note 1: Sample test only. Note 2: Not 100% production tested. Note 3: Production test at room with temperature guardbanded limits. ...

Page 4

... RE46C128 CMOS Ionization Smoke Detector ASIC with Interconnect Product Specification © 2009 Microchip Technology Inc. RE46c128 Functional Block Diagram Figure 1 R&E International A Subsidiary of Microchip Technology Inc. DS22171B-page 4 ...

Page 5

... RE46C128 CMOS Ionization Smoke Detector ASIC with Interconnect Product Specification DEVICE DESCRIPTION and APPLICATION NOTES Internal Timing With external components as indicated on the application drawing the period of the oscillator is nominally 1.67 seconds in standby. Every 1.66 seconds the detection circuitry is powered up for 10.5mS and the status of the smoke comparator is latched ...

Page 6

... R3, R4 and C1 are typical values and may be adjusted to maximize sound pressure. C2 should be located as close as possible to the device power pins. Route the pin 8 PC board trace away from pin 7 to avoid signal coupling. © 2009 Microchip Technology Inc. RE46c128 Typical Application Figure 2 R&E International A Subsidiary of Microchip Technology Inc. ...

Page 7

... RE46C128 CMOS Ionization Smoke Detector ASIC with Interconnect Product Specification Standby Mode; No Low Battery; No Alarm Oscillator Pin 15 > Pin 13 1.67S 10.5mS Internal Clock 24 Clock Cycles (40 S) LED Sample Smoke Horn IO (Pin 2) as Output Timing not same scale as above IO Charge Dump T IOFILT ...

Page 8

... RE46C128 CMOS Ionization 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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