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RE46C152 Datasheet

Download or read online Microchip Technology RE46C152 CMOS Ionization Smoke Detector ASIC With Interconnect, Timer Mode And Tone Select pdf datasheet.



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R&E International
A Subsidiary of Microchip Technology Inc.
RE46C152
CMOS Ionization Smoke Detector ASIC with Interconnect, Timer Mode and Tone Select
Product Specification
General Description
The RE46C152 is a 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 Tone input allows for selection of a
temporal pattern or a 2/3 duty cycle continuous tone.
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.
An internal 8 minute timer allows for a separate button
to be used for reduced sensitivity mode. Single button
operation for test and timer mode is also possible.
Although this device was designed for smoke detection
utilizing an ionization chamber it could be used in a
variety of security applications.
Utilizing low power CMOS technology the RE46C152
was designed for use in smoke detectors that comply
with Underwriters Laboratory 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)
16L PDIP
Internal Low Battery Detection
Power Up Low Battery Test
Interconnect up to 40 Detectors
Pin selectable horn patterns
8 Minute Timer for Sensitivity Control
Available in RoHS Compliant Pb Free Packaging.
Pin Configuration
1
TSTART
16
IO
2
15
TONE
3
14
TSTROBE
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
DS22175A-page 1

Summary of Contents

Page 1

... CMOS Ionization Smoke Detector ASIC with Interconnect, Timer Mode and Tone Select Product Specification General Description The RE46C152 is a 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. ...

Page 2

... RE46C152 CMOS Ionization Smoke Detector ASIC with Interconnect, Timer Mode and Tone Select Product Specification DC Electrical Characteristics 25°C, VDD9V, OSCAP.1uF, RBIAS8.2MΩ, VSS0V (unless otherwise noted) Parameter Symbol Supply Voltage Supply Current Input Voltage High Input Voltage Low Input Leakage Low ...

Page 3

... RE46C152 CMOS Ionization Smoke Detector ASIC with Interconnect, Timer Mode and Tone Select Product Specification DC Electrical Characteristics Continued Parameter Symbol Offset Voltage Common Mode Voltage V V Output Impedance Hysteresis Note 1: Sample test only. Note 2: Not 100% production tested. Note 3: Production test at room with temperature guardbanded limits. ...

Page 4

... RE46C152 CMOS Ionization Smoke Detector ASIC with Interconnect, Timer Mode and Tone Select Product Specification AC Electrical Characteristics 25°C, VDD9V, OSCAP.1uF, RBIAS8.2MΩ, VSS0V (unless otherwise noted) Parameter Symbol Oscillator Period T T Oscillator Pulse Width LED On Time LED Off Time ...

Page 5

... RE46C152 CMOS Ionization Smoke Detector ASIC with Interconnect, Timer Mode and Tone Select Product Specification © 2009 Microchip Technology Inc. Functional Block Diagram R&E International A Subsidiary of Microchip Technology Inc. DS22175A-page 5 ...

Page 6

... VDD. Reverse Battery Protection The RE46c152 internally limits the current from VSS to VDD in the event of accidental polarity reversal input is connected to VDD it should be done through a resistance of at least 1.5K to limit the reverse current through this path. © ...

Page 7

... RE46C152 CMOS Ionization Smoke Detector ASIC with Interconnect, Timer Mode and Tone Select Product Specification Typical Application 2 Buttons Operation, Temporal Horn Pattern Notes for Application Drawing Figure 2: Select R9 to reduce sensitivity during the timer mode. R3, R4 and C1 are typical values and may be adjusted to maximize sound pressure. ...

Page 8

... RE46C152 CMOS Ionization Smoke Detector ASIC with Interconnect, Timer Mode and Tone Select Product Specification Typical Application 1 Button Operation, Temporal Horn Pattern Notes for Application Drawing Figure 3: Select R5 and R6 values for the correct level to test the ion chamber. The voltage level at the TSTART input (pin 1) must be greater than the minimum VIH level to initiate the timer mode ...

Page 9

... RE46C152 CMOS Ionization Smoke Detector ASIC with Interconnect, Timer Mode and Tone Select Product Specification Typical Application 2 Button Operation 2/3 Duty Cycle Continuous Tone Horn Pattern Notes for Application Drawing Figure 4: Select R5 and R6 values for the correct level to test the ion chamber. The voltage level at the TSTART input (pin 1) must be greater than the minimum VIH level to initiate the timer mode ...

Page 10

... RE46C152 CMOS Ionization Smoke Detector ASIC with Interconnect, Timer Mode and Tone Select Product Specification Standby Mode; No Low Battery; No Alarm Oscillator Pin 15 > Pin 13 1.67S 10.5m S Internal Clock 24 Clock Cycles (40 S) LED Sample Smoke (NFPA72) Horn (2/3 Duty Cycle, TONEVSS) Horn (NFPA72, TONEOpen) ...

Page 11

... RE46C152 CMOS Ionization Smoke Detector ASIC with Interconnect, Timer Mode and Tone Select Product Specification Oscillator 10.5mS Internal Clock TSTART T LOF3 LED Outputs High Z TSTROBE © 2009 Microchip Technology Inc. Timing Diagram (Timer Mode) 1.67S T TPER R&E International A Subsidiary of Microchip Technology Inc. ...

Page 12

... RE46C152 CMOS Ionization Smoke Detector ASIC with Interconnect, Timer Mode and Tone Select 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 ...

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