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  Microchip Technology Semiconductor Electronic Components Datasheet  

RE46C190 Datasheet

CMOS Low Voltage Photoelectric Smoke Detector ASIC

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RE46C190www.DataSheet4U.com
CMOS Low Voltage Photoelectric Smoke Detector ASIC
with Interconnect and Timer Mode
Features
• Two AA Battery Operation
• Internal Power On Reset
• Low Quiescent Current Consumption
• Available in 16L N SOIC
• Local Alarm Memory
• Interconnect up to 40 Detectors
• 9 Minute Timer for Sensitivity Control
• Temporal or Continuous Horn Pattern
• Internal Low Battery and Chamber Test
• All Internal Oscillator
• Internal Infrared Emitter Diode (IRED) driver
• Adjustable IRED Drive current
• Adjustable Hush Sensitivity
• 2% Low Battery Set Point
Description
The RE46C190 is a low power, low voltage 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 every 10 seconds, to keep the
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 is performed every
86 seconds, and chamber integrity is tested once every
43 seconds, when in Standby. The temporal horn pat-
tern supports the NFPA 72 emergency evacuation sig-
nal.
An interconnect pin allows multiple detectors to be
connected such that, when one unit alarms, all units will
sound.
An internal 9 minute timer can be used for a Reduced
Sensitivity mode.
Utilizing low power CMOS technology, the RE46C190
was designed for use in smoke detectors that comply
with Underwriters Laboratory Specification UL217 and
UL268.
PIN CONFIGURATION
VSS
IRED
VDD
TEST
TEST2
IRP
IRN
RLED
RE46C190
SOIC
1 16
2 15
3 14
4 13
5 12
6 11
7 10
89
LX
VBST
HS
HB
IO
IRCAP
FEED
GLED
2010 Microchip Technology Inc.
DS22271A-page 1


  Microchip Technology Semiconductor Electronic Components Datasheet  

RE46C190 Datasheet

CMOS Low Voltage Photoelectric Smoke Detector ASIC

No Preview Available !

RE46C190
TYPICAL BLOCK DIAGRAM
TEST2 (5)
TEST (4)
Precision
Reference
VDD (3)
R3
R4
IRP (6)
IRN (7)
Photo
Integrator
Low Battery
+ Comparator
-
Smoke
Comparator
+
-
Control
Logic and
Timing
IRCAP (11)
+
-
Programmable
Limits
High
Normal
Hysteresis
IRED (2)
VSS (1)
Programmable
IRED Current
Trimmed
Oscilator
POR and
BIAS
Programming
Control
Boost Control
Current
Sense
Boost Comparator
+
-
Level
Shift
Horn Driver
Interconnect
wwLXw(.1D6a)taSheet4U.com
VBST (15)
RLED (8)
HB (13)
HS (14)
FEED (10)
IO (12)
GLED (9)
DS22271A-page 2
2010 Microchip Technology Inc.


Part Number RE46C190
Description CMOS Low Voltage Photoelectric Smoke Detector ASIC
Maker Microchip Technology
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RE46C190 Datasheet PDF






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