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RE46C144 Datasheet

Download or read online Microchip Technology RE46C144 CMOS Photoelectric Smoke Detector ASIC With Interconnect And Timer Mode pdf datasheet.



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CMOS Photoelectric Smoke Detector ASIC with Interconnect
Features
• Internal Power-On Reset
• Low Quiescent Current Consumption
• ESD Protection on all Pins
• Interconnect up to 40 Detectors
• 10 Minute Timer for Sensitivity Control
• 75% Duty Cycle Horn Pattern
• Internal Low Battery and Chamber Test
• Compatible with Allegro A5358
• UL Recognized per File S24036
 2009-2012 Microchip Technology Inc.
RE46C144
and Timer Mode
General Description
The RE46C144 is a 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 100 µs every 10 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 43 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.
An internal 10 minute timer can be used for a reduced
sensitivity mode.
The RE46C144 device is recognized by
Underwriters Laboratories for use in smoke
detectors that comply with specification UL217 and
UL268.
Package Types
PDIP, SOIC, SOICN
C1
C2
DETECT
STROBE
V
DD
IRED
IO
HORNB
RE46C144
1
16
TEST
2
15
VSEN
3
14
V
SS
ROSC
4
13
5
12
COSC
6
11
LED
7
10
FEED
8
9
HORNS
DS22180C-page 1

Summary of Contents

Page 1

... Microchip Technology Inc. RE46C144 and Timer Mode General Description The RE46C144 is a 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

... RE46C144 Functional Block Diagram VDD (5) VSEN (15) V -3.5V DD PHOTOAMP DETECT ( (1) C2 (2) V -5V DD STROBE (4) TEST (16) VSS (14) Typical Application µF Battery R3 R 8.2k ADJ1 C1 .047 µ 4700 pF R4 560 R ADJ2 4.7k 250k Smoke Chamber 100 µ Other Units ...

Page 3

... RE46C144 -25°C to 75° 9V Units Conditions V Operating µA Configured as in Typical Application, COSCV SS µA Configured as in Typical Application 12V, DD COSC V SS ...

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... RE46C144 DC ELECTRICAL CHARACTERISTICS (CONTINUED) DC Electrical Characteristics: Unless otherwise indicated, all parameters apply at T Parameter Symbol Test Pin Input Leakage High I IH1 I 3, 10, 12 IH2 I HFD Input Pull Down I PD1 Current I PD2 I PDIO1 I PDIO2 Output Leakage I OZL1 Current Low Output Leakage I OZH1 ...

Page 5

... RE46C144 -25°C to 75° 9V 1.5 nF. 5 Units Conditions ms No alarm condition ms Operating s Standby, no alarm s Local alarm condition s Timer mode, no local alarm s Remote alarm only s Standby, no alarm s Standby, after one valid smoke ...

Page 6

... RE46C144 TEMPERATURE CHARACTERISTICS Electrical Specifications: Unless otherwise indicated, V Parameters Temperature Ranges Operating Temperature Range Storage Temperature Range Thermal Package Resistances Thermal Resistance, 16L-PDIP Thermal Resistance, 16L-SOIC (150 mil.) Thermal Resistance, 16L-SOIC (300 mil.) DS22180C-page Symbol Min. Typ. Max. ...

Page 7

... This pin has an internal pull-down device. 2.7 Horn Brass, Inverted Output (HB) The HB pin is connected to the metal electrode of a piezoelectric transducer. 2.8 Horn Silver Output Pin (HS) The HS pin is a complementary output to HB and connects to the ceramic electrode of the piezoelectric transducer. RE46C144 ) DD DS22180C-page 7 ...

Page 8

... RE46C144 2.9 Horn Feedback Pin (FEED) Usually this pin is connected to the feedback electrode through a current limiting resistor. If not used, this pin must be connected 2.10 LED Driver Pin (LED) This pin is an open drain NMOS output used to drive a visible LED. 2.11 Oscillator Capacitor Input (COSC) ...

Page 9

... In local alarm, the C2 gain is internally increased by approximately 10% to provide alarm hysteresis. 2009-2012 Microchip Technology Inc. RE46C144 3.3 Push-to-Test Operation If the Test input pin is activated (V ), after one internal ...

Page 10

... RE46C144 3.6 Low Battery Detection In Standby, an internal reference is compared to the voltage divided V supply. A low battery status is DD latched at the conclusion of the LED pulse. The horn will chirp for 10 ms every 43 seconds, until the low battery condition no longer exists. The low battery test is not performed in a local or remote alarm condition ...

Page 11

... Low BatteryTest Low Battery Warning Chirp Horn Chamber Test and Warning is Offset from Low Battery Test and Warning by 21.5 Seconds FIGURE 3-1: RE46C144 Timing Diagram Standby, Low Supply and Chamber Test Failure. 2009-2012 Microchip Technology Inc. Standby, No Alarm (not to scale) T PER1 ...

Page 12

... 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 FIGURE 3-2: RE46C144 Timing Diagram Local Alarm, Horn and Interconnect Timings. DS22180C-page 12 Local Alarm Timing (not to scale) T ...

Page 13

... In the event the full Microchip part number cannot be marked on one line, it will be carried over to the next line, thus limiting the number of available characters for customer-specific information. 2009-2012 Microchip Technology Inc. RE46C144 Example RE46C144-V/P 1207256 Example RE46C144 e V/SL 3 1207256 Example RE46C144 e V/SO 3 1207256 ) e 3 DS22180C-page 13 ...

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... RE46C144 /HDG 3ODVWLF 'XDO ,Q/LQH 3 ± PLO %RG >3',3@ 1RWH N NOTE 1RWHV DS22180C-page 2009-2012 Microchip Technology Inc. ...

Page 15

... Note: For the most current package drawings, please see the Microchip Packaging Specification located at http://www.microchip.com/packaging 2009-2012 Microchip Technology Inc. RE46C144 DS22180C-page 15 ...

Page 16

... RE46C144 Note: For the most current package drawings, please see the Microchip Packaging Specification located at http://www.microchip.com/packaging DS22180C-page 16 2009-2012 Microchip Technology Inc. ...

Page 17

... Note: For the most current package drawings, please see the Microchip Packaging Specification located at http://www.microchip.com/packaging 2009-2012 Microchip Technology Inc. RE46C144 DS22180C-page 17 ...

Page 18

... RE46C144 Note: For the most current package drawings, please see the Microchip Packaging Specification located at http://www.microchip.com/packaging DS22180C-page 18 2009-2012 Microchip Technology Inc. ...

Page 19

... Note: For the most current package drawings, please see the Microchip Packaging Specification located at http://www.microchip.com/packaging 2009-2012 Microchip Technology Inc. RE46C144 DS22180C-page 19 ...

Page 20

... RE46C144 /HDG 3ODVWLF 6PDOO 2XWOLQH 62 ± :LGH PP %RG >62,&@ /DQG 3DWWHUQ 1RWH DS22180C-page 20 2009-2012 Microchip Technology Inc. ...

Page 21

... Pin Simplified Table 3-1, and added description sections. 5. Added Section 4.0, Packaging Information. 6. Added the Product Identification section. Revision B (October 2009) Undocumented changes Revision A (May 2009) Original Release of this Document 2009-2012 Microchip Technology Inc. and table. Description. System RE46C144 DS22180C-page 21 ...

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... RE46C144 NOTES: DS22180C-page 22 2009-2012 Microchip Technology Inc. ...

Page 23

... Small Plastic Outline - Wide, 7.50 mm Body, 16-Lead (SOIC) 2009-2012 Microchip Technology Inc. RE46C144 . Examples: a) RE46C144E16F: 16LD PDIP Package b) RE46C144S16F: 16LD SOIC Package c) RE46C144S16TF: 16LD SOIC Package, Tape and Reel d) RE46C144SW16F: 16LD SOIC Package e) RE46C144SW16TF: 16LD SOIC Package, Tape and Reel DS22180C-page 23 ...

Page 24

... RE46C144 NOTES: DS22180C-page 24 2009-2012 Microchip Technology Inc. ...

Page 25

... Select Mode, Total Endurance, TSHARC, UniWinDriver, WiperLock and ZENA are trademarks of Microchip Technology Incorporated in the U.S.A. and other countries. SQTP is a service mark of Microchip Technology Incorporated in the U.S.A. All other trademarks mentioned herein are property of their respective companies. © 2009-2012, Microchip Technology Incorporated, Printed in the U ...

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... Singapore Tel: 65-6334-8870 Fax: 65-6334-8850 Taiwan - Hsin Chu Tel: 886-3-5778-366 Fax: 886-3-5770-955 Taiwan - Kaohsiung Tel: 886-7-536-4818 Fax: 886-7-330-9305 Taiwan - Taipei Tel: 886-2-2500-6610 Fax: 886-2-2508-0102 Thailand - Bangkok Tel: 66-2-694-1351 Fax: 66-2-694-1350 2009-2012 Microchip Technology Inc. 11/29/11 ...

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