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RE46C112 Datasheet

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R&E International
A Subsidiary of Microchip Technology Inc.
RE46C112
Ionization Smoke Detector IC
Product Specification
General Description
The RE46C112 is an ionization type smoke detector IC.
It is intended for applications using ionization type
chambers to detect smoke. When enabled, VOUT is ¼
of either the DETECT input or VDD depending on the
status of the SELECT input. When the Select input is
allowed to float the circuit is in the low current mode
with only the guard amplifier enabled.
Utilizing low power CMOS technology the RE46C112
was designed for use in smoke detectors that comply
with Underwriters Laboratory Specification UL217.
ABSOLUTE MAXIMUM RATINGS
PARAMETER
Supply Voltage
Supply Voltage
Detect Input Voltage Range
SELECT Input Voltage Range
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
Guard Outputs for Ion Detector Input
± 0.75pA Detect Input Current
Microprocessor A/D Compatible Analog Output
Low Quiescent Current Consumption (<10uA)
Available in 8L PDIP or 8L N SOIC
2000V ESD Protection (HBM)
Available in Standard Packaging or RoHS
Compliant Pb Free Packaging
Pin Configuration
1
VDD
VCC
SELECT
VSS
SYMBOL
VALUE
V
12.5
DD
V
6
CC
V
V
+.3
INDET
DD
V
V
+.3
INSEL
CC
T
-10 to 60
A
T
-55 to 125
STG
T
150
J
8
G 2
DETECT
G 1
VO UT
UNITS
V
V
V
V
°C
°C
°C
DS22161A-page 1

Summary of Contents

Page 1

... RE46C112 Ionization Smoke Detector IC Product Specification General Description The RE46C112 is an ionization type smoke detector IC intended for applications using ionization type chambers to detect smoke. When enabled, VOUT is ¼ of either the DETECT input or VDD depending on the status of the SELECT input. When the Select input is allowed to float the circuit is in the low current mode with only the guard amplifier enabled ...

Page 2

... RE46C112 Ionization Smoke Detector IC Product Specification Electrical Characteristics 25° DD9V, VCC5V, VSS0V (unless otherwise noted) Paramete r Supply Voltage Supply Current Input Voltage High Input Voltage Low Input Leakage Offset Voltage Common Mode Voltage Output Impedance Output Voltage Note 1: Sample test only © ...

Page 3

... RE46C112 Ionization Smoke Detector IC Product Specification PIN 1 (VDD) - This pin should be connected to the most positive supply potential, typically a 9 Volt battery. The VDD voltage can range between 6V and 12V with respect to VSS. Reverse battery protection must be provided externally. PIN 2 (VCC) This positive supply potential can range between 2.7V and 5.5V with respect to VSS and must be less than the VDD voltage. This pin is usually connected to a microprocessor positive supply voltage. PIN 3 (SELECT) – ...

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... RE46C112 Ionization Smoke Detector IC Product Specification © 2009 Microchip Technology Inc. Functional Block Diagram Figure 1 R&E International A Subsidiary of Microchip Technology Inc. DS22161A-page 4 ...

Page 5

... RE46C112 Ionization Smoke Detector IC Product Specification © 2009 Microchip Technology Inc. A Subsidiary of Microchip Technology Inc. Typical Application Figure 2 R&E International DS22161A-page 5 ...

Page 6

... RE46C112 Ionization Smoke Detector IC 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 KIND WHETHER EXPRESS OR IMPLIED, WRITTEN OR ORAL, ...

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... RE46C112 Ionization Smoke Detector IC Product Specification © 2009 Microchip Technology Inc. R&E International A Subsidiary of Microchip Technology Inc. DS22161A-page 7 ...

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