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RE46C145 Datasheet

Download or read online Microchip Technology RE46C145 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
• Temporal Horn Pattern
• Internal Low Battery and Chamber Test
• Compatible with Allegro A5366
• Alternate Diagnostic Mode
• UL Recognized per File S24036
 2009-2012 Microchip Technology Inc.
RE46C145
and Timer Mode
General Description:
The RE46C145 is a low-power, CMOS photoelec-
tric-type smoke detector IC. With minimal external
components, this circuit will provide all the required fea-
tures 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.
In diagnostic mode, the photo amplifier output is avail-
able on pin 15 for production calibration of the photo
chamber.
When in Standby, a check for a low battery condition
and chamber integrity is performed every 43 seconds.
The temporal horn pattern supports the NFPA 72
emergency evacuation signal.
An interconnect pin allows multiple detectors to be con-
nected such that when one units alarms, all units will
sound.
An internal 10 minute timer can be used for a reduced
sensitivity mode.
The RE46C145 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
RE46C145
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
DS22181C-page 1

Summary of Contents

Page 1

... Microchip Technology Inc. RE46C145 and Timer Mode General Description: The RE46C145 is a low-power, CMOS photoelec- tric-type smoke detector IC. With minimal external components, this circuit will provide all the required fea- tures for a photoelectric-type smoke detector. The design incorporates a gain-selectable photo amplifier for use with an infrared emitter/detector pair ...

Page 2

... RE46C145 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

... RE46C145 -25°C to 75° Units Conditions V Operating µA Configured as in Typical Application, COSC LED off µA Configured as in Typical Application 12V, DD COSC V ...

Page 4

... RE46C145 DC ELECTRICAL CHARACTERISTICS (CONTINUED) DC Electrical Characteristics: Unless otherwise indicated, all parameters apply at T Parameter Symbol Input Leakage High I IH1 I IH2 I HFD Input Pull Down Current I PD1 I PD2 I PDIO1 I PDIO2 Output Leakage I OZL1 Current Low Output Leakage I OZH1 Current High Output Voltage Low ...

Page 5

... RE46C145 -25°C to 75° Units Test 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

... RE46C145 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.) DS22181C-page Sym. Min. Typ. Max. ...

Page 7

... This pin has an internal pull-down device. 2.7 Horn Brass, Inverted Output (HB) HB pin is connected to the metal electrode of a piezoelectric transducer. 2.8 Horn Silver Output Pin (HS) HS pin is a complementary output to HB and connects to the ceramic electrode of the piezoelectric transducer. RE46C145 ) DD DS22181C-page 7 ...

Page 8

... RE46C145 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

... The interconnect input has a 670 ms nominal digital filter. This allows for interconnection to other types of alarms (carbon monoxide, for example) that may have a pulsed interconnect signal. RE46C145 ), after one IH DS22181C-page 9 ...

Page 10

... RE46C145 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

... LED Low BatteryTest Low BatteryWarning Chirp Horn Chamber Test and Warning is Offset from Low Battery Test and Warning by 21.5 Seconds. FIGURE 3-1: RE46C145 Timing Diagram Standby, Low Supply and Chamber Test Failure. 2009-2012 Microchip Technology Inc. Standby, No Alarm (not to scale) T PER1 T ...

Page 12

... Note 1: Smoke is not sampled when the horn is active. Horn cycle is self completing in local alarm, but not in remote alarm. 2: Low battery warning chirp is suppressed in local or remote alarm Dump active only in local alarm, inactive if external alarm. FIGURE 3-2: RE46C145 Timing Diagram Local Alarm, Horn and Interconnect Timings. DS22181C-page 12 Local Alarm Timing (not to scale) T PER2 ...

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. RE46C145 Example RE46C145-V/P 1220256 Example RE46C145 V/SL 1220256 Example RE46C145 V/SO 1220256 ) e 3 DS22181C-page 13 ...

Page 14

... RE46C145 /HDG 3ODVWLF 'XDO ,Q/LQH 3 ± PLO %RG >3',3@ 1RWH N NOTE 1RWHV DS22181C-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. RE46C145 DS22181C-page 15 ...

Page 16

... RE46C145 Note: For the most current package drawings, please see the Microchip Packaging Specification located at http://www.microchip.com/packaging DS22181C-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. RE46C145 DS22181C-page 17 ...

Page 18

... RE46C145 Note: For the most current package drawings, please see the Microchip Packaging Specification located at http://www.microchip.com/packaging DS22181C-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. RE46C145 DS22181C-page 19 ...

Page 20

... RE46C145 /HDG 3ODVWLF 6PDOO 2XWOLQH 62 ± :LGH PP %RG >62,&@ /DQG 3DWWHUQ 1RWH DS22181C-page 20 2009-2012 Microchip Technology Inc. ...

Page 21

... Section 2.0, Pin Description. Sim- plified Table 2-1, added description sections. 5. Added Section 4.0, Packaging Information. 6. Added Product Identification System Revision B (October 2009) Undocumented changes. Revision A (May 2009) Original Release of this Document. 2009-2012 Microchip Technology Inc. and Typical table. section. RE46C145 DS22181C-page 21 ...

Page 22

... RE46C145 NOTES: DS22181C-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. RE46C145 . Examples: a) RE46C145E16F: 16LD PDIP Package b) RE46C145S16F: 16LD SOIC Package c) RE46C145S16TF: 16LD SOIC Package, Tape and Reel d) RE46C145SW16F: 16LD SOIC Package e) RE46C145SW16TF: 16LD SOIC Package, Tape and Reel DS22181C-page 23 ...

Page 24

... RE46C145 NOTES: DS22181C-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 ...

Page 26

... 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 2011 Microchip Technology Inc. 11/29/11 ...

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