RE46C145 CMOS Photoelectric Smoke Detector ASIC with Interconnect and Timer Mode Features: General Description: • • • • • • • • • • The RE46C145 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. 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 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 available 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 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 RE46C145 is recognized by Underwriters Laboratories for use in smoke detectors that comply with specification UL217 and UL268. Package Types RE46C145 PDIP, SOIC, SOICN 2009-2012 Microchip Technology Inc. C1 1 16 TEST C2 2 15 VSEN DETECT 3 14 VSS STROBE 4 13 ROSC VDD 5 12 COSC IRED 6 11 LED IO 7 10 FEED HORNB 8 9 HORNS DS22181C-page 1 RE46C145 Functional Block Diagram VDD (5) Low Battery IO (7) + - FEED (10) Horn Driver HS (9) + VSEN (15) Smoke Comparator Logic and Timing HB (8) LED (11) V DD -3.5V PHOTOAMP DETECT (3) Bias and Power Reset + - C1 (1) IRED (6) C2 (2) ROSC (13) Oscillator COSC (12) V DD -5V STROBE (4) TEST (16) VSS (14) Typical Application C3 1 μF 9V Battery RADJ1 R3 8.2k R2 5k Push-to-Test C1 .047 μF C2 4700 pF 1 16 2 15 R12 10M 3 14 C5 1.5nF 4 13 R4 560 RADJ2 R1 4.7k D6 R5 250k R9 100k Smoke Chamber C4 100 μF To Other Units 5 12 6 11 7 10 8 9 R7 22 R8 100 Note 1: R13 330 Q3 D5 R6 1k D3 C6 1.0nF R11 220k R10 1.5M C3 should be located as close as possible to the device power pins. 2: C3 is typical for an alkaline battery. This capacitance should be increased to 4.7 µF or greater for a carbon battery. 3: R10, R11 and C6 are typical values and may be adjusted to maximize sound pressure. DS22181C-page 2 2009-2012 Microchip Technology Inc. RE46C145 1.0 ELECTRICAL CHARACTERISTICS 1.1 Absolute Maximum Ratings† † Notice: Stresses above those listed under “Maximum ratings” may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operation listings of this specification is not implied. Exposure to maximum rating conditions for extended periods may affect device reliability. VDD....................................................................................15V Input Voltage Range Except FEED, IO .......... VIN = -.3V to VDD +.3V FEED Input Voltage Range ..................... VINFD =-10 to +22V IO Input Voltage Range................................. VIO1= -.3 to 15V Input Current except FEED ................................... IIN = 10 mA Operating Temperature ................................TA = -25 to +75°C Storage Temperature ............................TSTG = -55 to +125°C Maximum Junction Temperature ......................... TJ = +150°C DC ELECTRICAL CHARACTERISTICS DC Electrical Characteristics: Unless otherwise indicated, all parameters apply at TA = -25°C to +75°C, VDD = 9V Symbol Test Pin Supply Voltage VDD Supply Current IDD1 Parameter Input Voltage High Input Voltage Low Input Leakage Low Note 1: 2: 3: 4: Min Typ Max Units Conditions 5 6 — 12 V Operating 5 — 4 6 µA Configured as in Typical Application, COSC = VSS, LED off IDD2 5 — 5.5 8 µA Configured as in Typical Application, VDD = 12V, COSC = VSS IDD3 5 — — 2 mA Configured as in Typical Application, STROBE on, IRED off, VDD=12V IDD4 5 — — 3 mA Configured as in Typical Application, STROBE on, IRED on, VDD = 12V, Note 1 VIH1 10 6.2 — — V FEED VIH2 7 3.2 — — V No Local Alarm, IO as Input VIH3 15 1.6 — — V VSEN VIH4 16 8.5 — — V TEST VIL1 10 — — 2.7 V FEED VIL2 7 — — 1.5 V No Local Alarm, IO as Input VIL3 15 — — .5 V VSEN VIL4 16 — — 7 V TEST IIL1 1,2,3 — — -100 nA VDD = 12V, COSC = 12V, STROBE active IIL2 10,12 — — -100 nA VDD = 12V, VIN = VSS IIL3 15,16 — — -1 µA VDD = 12V, VIN = VSS ILFD 10 — — -50 µA FEED = -10V Does not include Q3 emitter current. Not production tested. Typical values are for design information and are not ensured. Limits over the specified temperature range are not production tested and are based on characterization data. 2009-2012 Microchip Technology Inc. DS22181C-page 3 RE46C145 DC ELECTRICAL CHARACTERISTICS (CONTINUED) DC Electrical Characteristics: Unless otherwise indicated, all parameters apply at TA = -25°C to +75°C, VDD = 9V Parameter Input Leakage High Input Pull Down Current Symbol Test Pin Min Typ Max Units IIH1 1,2 — — 100 nA VDD = 12V, VIN = VDD, STROBE active IIH2 3,10,12 — — 100 nA VDD = 12V, VIN = VDD IHFD 10 — — 50 µA FEED = 22V IPD1 16 .25 — 10 µA VIN = VDD IPD2 15 .1 .25 .5 µA VIN = VDD IPDIO1 7 20 — 80 µA VIN = VDD Conditions IPDIO2 7 — — 140 µA VIN = 15V, VDD = 12 Output Leakage Current Low IOZL1 11,13 — — -1 µA Output Off, Output = VSS Output Leakage Current High IOZH1 11,13 — — 1 µA Output Off, Output = VDD Output Voltage Low VOL1 8,9 — — 1 V Iol = 16 mA, VDD = 6.5V VOL2 13 — .5 — V Iol = 5 mA, VDD = 6.5V .6 VOL3 11 — — Output Voltage High VOH1 8,9 5.5 — V Iol = 10 mA, VDD = 6.5V V Iol = -16 mA, VDD = 6.5V Output Current IIOH1 7 -4 — -16 mA Alarm, VIO = VDD–2V or VIO = 0V IIODMP 7 5 — — mA At Conclusion of Local Alarm or Test, VVIO = 1V Low Battery Alarm Voltage VLB 5 6.9 7.2 7.5 V Output Voltage VSTOF 4 VDD–.1 — — V STROBE off, VDD = 12V, IOUT = -1 µA VSTON 4 VDD– 5.25 V STROBE on, VDD = 9V IOUT = 100 µA to 500 µA VIREDOF 6 — — .1 V IRED off, VDD = 12V, IOUT = 1 µA VIREDON 6 2.85 3.1 3.35 V IRED on, VDD = 9V IOUT = 0 to -6 mA, TA = +25°C Common Mode Voltage VCM1 1,2,3 .5 — VDD–2 V Local smoke, Push to Test or Chamber Test, Note 2 Smoke Comparator Reference VREF - VDD–3.7 — VDD–3.3 V Internal Reference Temperature Coefficient TCST 4 — .01 — %/ºC VDD = 6V to 12V, STROBE Output Voltage TCIRED 6 — .3 — %/ºC VDD = 6V to 12V, IRED Output Voltage VSTON 4,5 — -50 — dB Active, VDD =6V to 12V VIREDON 6,5 — -30 — dB Active, VDD = 6V to 12V Line Regulation Note 1: 2: 3: 4: VDD–5 VDD–4.75 Does not include Q3 emitter current. Not production tested. Typical values are for design information and are not ensured. Limits over the specified temperature range are not production tested and are based on characterization data. DS22181C-page 4 2009-2012 Microchip Technology Inc. RE46C145 AC ELECTRICAL CHARACTERISTICS AC Electrical Characteristics: Unless otherwise indicated, all parameters apply at TA = -25°C to +75°C, VDD = 9V, VSS = 0V, Component Values from Typical Application; R9 = 100 K, R12 = 10 M, C5 = 1.5 nF Parameter Oscillator Period LED and STROBE On Time LED Period STROBE and IRED Pulse Period Test Pin Min Typ TPOSC 12 9.4 10.5 11.5 ms No alarm condition TON1 11,4 9.4 10.5 11.5 ms Operating TPLED1 11 39 43 47 s TPLED2 11 .45 .5 .55 s Local alarm condition TPLED3 11 9.6 10.75 11.8 s Timer mode, no local alarm TPLED4 11 s Remote alarm only Symbol Max LED IS NOT ON Units Test Conditions Standby, no alarm TPER1 4,6 9.6 10.75 11.8 s Standby, no alarm TPER1A 4,6 1.8 2 2.2 s Standby, after one valid smoke sample TPER1B 4,6 .9 1 1.1 s Standby, after two consecutive valid smoke samples TPER2 4,6 .9 1 1.1 s In Local Alarm (three consecutive valid smoke samples) TPER3 4,6 7.2 8 8.9 s In Remote Alarm TPER4 4,6 300 336 370 ms Push-button test TPER5 4,6 39 47 s Chamber Test or Low Battery Test, no alarms IRED On Time TON2 6 94 104 115 µs Operating Horn On Time THON1 8,9 450 500 550 ms Operating, alarm condition, Note 1 THON2 8,9 9.5 10.5 11.5 ms Low Battery or Failed Chamber test , no alarm THOF1 8,9 450 500 550 ms Operating, alarm condition, Note 1 THOF2 8,9 1.35 1.5 1.65 s Operating, alarm condition, Note 1 THOF3 8,9 39 43 47 s Low Battery or Failed Chamber test, no alarm IO Charge Dump Duration TIODMP 7 .9 1.46 s At the conclusion of the Local Alarm or Test IO Delay TIODLY1 7 s From start of Local Alarm to IO Active IO Filter TIOFILT 7 600 mSs IO pulse-width ensured to be filtered. IO as input, no local alarm Remote Alarm Delay TIODLY2 7 2.0 s Timer Period TTPER 10 Min Horn Off Time Note 1: 2: 3: 4: 0 1.05 7 8.5 No local alarm, from IO Active to Horn Active No alarm condition, Note 2 See timing diagram for Horn Temporal Pattern During the Timer mode, the LED period is 10.5 seconds. The LED period will return to 43 seconds at the conclusion of the Timer mode. TPOSC and TON2 are 100% production tested. All other timing is ensured by functional testing. Typical values are for design information and are not ensured. 2009-2012 Microchip Technology Inc. DS22181C-page 5 RE46C145 TEMPERATURE CHARACTERISTICS Electrical Specifications: Unless otherwise indicated, VDD = 9V, VSS = 0V Parameters Sym. Min. Typ. Max. Units Conditions Temperature Ranges TA -25 — +75 °C TSTG -55 — +125 °C Thermal Resistance, 16L-PDIP θJA — 70 — °C/W Thermal Resistance, 16L-SOIC (150 mil.) θJA — 86.1 — °C/W Thermal Resistance, 16L-SOIC (300 mil.) θJA — 80 — °C/W Operating Temperature Range Storage Temperature Range Thermal Package Resistances DS22181C-page 6 2009-2012 Microchip Technology Inc. RE46C145 2.0 PIN DESCRIPTION The descriptions of the pins are listed in . TABLE 2-1: PIN FUNCTION TABLE RE46C145 PDIP, SOIC, SOICN Symbol 1 C1 High Gain Capacitor Pin 2 C2 Normal Gain Capacitor Pin 3 DETECT 4 STROBE 5 VDD Positive Power Supply 6 IRED Infrared Emitting Diode Pin 7 IO 8 HB Horn Brass, Inverted Output 9 HS Horn Silver Output 10 FEED 11 LED 12 COSC Oscillator Capacitor Input 13 ROSC Oscillator Resistor Drive Low 2.1 Function Photo Diode Input Strobed Detection Negative Supply Interconnect Pin Horn Feedback Pin LED Driver Pin Negative Power Supply 14 VSS 15 VSEN HushTimer Sensitivity Pin 16 TEST Test Pin High/Normal Gain Capacitor Pins (C1, C2) The capacitor connected to C1 pin sets the photo amplifier gain (high) for the push-to-test and chamber sensitivity test. The size of this capacitor will depend on the chamber background reflections. A = 1+(C1/10), where C1 is expressed in pF. The gain should be <10000. The capacitor connected to C2 pin sets the photo amplifier gain (normal) during standby. The value of this capacitor will depend on the smoke sensitivity required. A = 1+(C2/10), where C2 is expressed in pF. 2.2 Positive Power Supply (VDD) The VDD pin is the device’s positive power supply input. 2.5 Infrared Emitting Diode Pin (IRED) Provides a regulated pulsed output voltage pre-driver for the infrared emitter. This output usually drives the base of an NPN transistor. 2.6 Interconnect Pin (IO) This bidirectional pin provides the capability to interconnect many detectors in a single system. This pin has an internal pull-down device. Photo Diode Input (DETECT) This input is normally connected to the cathode of an external photo diode operated at zero bias. 2.3 2.4 Strobed Detection Negative Supply (STROBE) Regulated output voltage of VDD-5 which is active during a test for smoke. This output is the negative side of the photo amplifier reference circuitry. 2009-2012 Microchip Technology Inc. 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. DS22181C-page 7 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 to VDD or VSS. 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) A capacitor connected to this pin, with a parallel resistor, sets the internal clock low time, which is approximately the clock period. 2.12 Oscillator Resistor Drive Low (ROSC) A resistor between this pin and COSC pin sets the internal clock high time. This also sets the IRED pulse width (100 - 200 µs). 2.13 Hush Timer Sensitivity Pin (VSEN) In Timer mode, this input pin can be used to set an external smoke comparator reference. 2.14 TEST Pin This input is used to invoke two test modes and the Timer mode. This input has an internal pull-down. DS22181C-page 8 2009-2012 Microchip Technology Inc. RE46C145 3.0 Note: 3.1 DEVICE DESCRIPTION All timing references are nominal. See Electrical Characteristics for limits. Standby Internal Timing With the external components specified in the Typical Application for R12 and C5, the internal oscillator has a nominal period of 10 ms. Normally the analog circuitry is powered down to minimize standby current (typically 4 µA at 9V). Once every 10 seconds the detection circuitry (normal gain) is powered up for 10 ms. Prior to completion of the 10 ms period, the IRED pulse is active for 100 µs. At the conclusion of the 10 ms period, the photo amplifier is compared to an internal reference to determine the chamber status and latched. If a smoke condition is present, the period to the next detection decreases and additional checks are made. Three consecutive smoke detections will cause the device to go into alarm, and the horn circuit and interconnect will be active. Once every 43 seconds the status of the battery voltage is checked. This status is checked and latched at the conclusion of the LED pulse. In addition, once every 43 seconds the chamber is activated and, using the high gain mode (capacitor C1), a check of the chamber is made by amplifying background reflections. If either the low battery or the photo chamber test fails, the horn will chirp for 10 ms every 43 seconds. The oscillator period is determined by the values of R9, R12 and C5 (see Typical Application). The oscillator period is as follows: EQUATION 3-1: T = TR + TF Where: TR = .6931 x R12 x C5 TF = .6931 x R9 x C5 3.2 Smoke Detection Circuitry A comparator compares the photo amp output to an internal reference voltage. If the required number of consecutive smoke conditions is met, the device will go into local alarm and the horn will be active. In local alarm, the C2 gain is internally increased by approximately 10% to provide alarm hysteresis. 2009-2012 Microchip Technology Inc. 3.3 Push-to-Test Operation If the TEST input pin is activated (VIH), after one internal clock cycle, the smoke detection rate increases to once every 330 ms. In this mode, the high-gain capacitor C1 is selected, and background reflections are used to simulate a smoke condition. After the required consecutive detections, the device will go into a local alarm condition. When the TEST input is deactivated (VIL) and after one clock cycle, the normal gain capacitor C1 is selected. The detection rate continues at once every 330 ms until three consecutive no smoke conditions are detected. At this point, the device returns to standby timing. 3.4 LED Operation In standby, the LED is pulsed on for 10 ms every 43 seconds. In a local alarm condition or the push-totest alarm, the LED pulse frequency is increased to once every .5 seconds. In the case of a remote alarm, the LED is not active. In the Timer mode of operation, the LED is pulsed on for 10 ms every 10 seconds. 3.5 Interconnect Operation The bidirectional I/O pin allows for interconnection of multiple detectors. In a local alarm condition, this pin is driven high immediately through a constant current source. Shorting this output to ground will not cause excessive current. The I/O is ignored as an input during a local alarm. The I/O pin also has an NMOS discharge device that is active for 1 second after the conclusion of any type of local alarm. This device helps to quickly discharge any capacitance associated with the interconnect line. If a remote active-high signal is detected, the device goes into remote alarm and the horn will be active. Internal protection circuitry allows for the signaling unit to have a higher supply voltage than the signaled unit, without excessive current draw. 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. DS22181C-page 9 RE46C145 3.6 Low Battery Detection In standby, an internal reference is compared to the voltage divided VDD supply. A low battery status is 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. 3.8 Timer Mode The low battery notification does not sound in a local or remote alarm condition. If resistors RADJ1 and RADJ2 are in place and a high-tolow transition occurs on the TEST input, the device enters a 10 minute timer mode. In this mode, the smoke comparator reference is switched from the internal VDD - 3.5V reference to the voltage that appears on VSEN (pin 15). This allows the sensitivity to be modified for the duration of the 9 minute timer period. The chamber test is performed in Timer mode. 3.7 If VSEN is left unconnected or tied to VSS, the Timer mode of operation is inhibited. Chamber Fail Detection In standby, a chamber test is also performed every 43 seconds, by switching to the high gain capacitor C1 and sensing the photo chamber background reflections. Two consecutive chamber test failures will also cause the horn to chirp for 10 ms every 43 seconds. The low battery chirp occurs just before the LED pulse (see Figure 3-1). The chamber test and chamber test failure chirp occurs approximately 21 seconds after the LED pulse. The chamber tests are not performed in a local or remote alarm condition. The chamber fail notification does not sound in a local or remote alarm condition. TABLE 3-1: 3.9 Diagnostic Mode In addition to the normal function of the TEST input, a special diagnostic mode is available to calibrate and test of the smoke detector. Taking the TEST pin below VSS and sourcing ~200 µA out of the pin for 1 clock cycle will enable the diagnostic mode. In the diagnostic mode, some of the pin functions are redefined. Refer to Table 3-1 for redefined pin functions in the diagnostic mode. In addition, in this mode STROBE is always enabled, and the IRED is pulsed at the clock rate of 10 ms nominal. DIAGNOSTIC MODE PIN FUNCTION Pin Name Pin Number IO 7 The IO pin (7) controls the gain capacitor used for the photo amplifier. If IO is low, then normal gain is selected. If IO is high, then high gain is selected. VSEN 15 In Diagnostic mode, the output of the photo amplifier is gated to this pin and the pulldown device is disabled. . FEED 10 If the IO pin (7) is low, then taking this input high will enable hysteresis, which is a nominal 10% gain increase in Normal Gain mode. COSC 12 If desired, this pin can be driven by an external clock. HORNB 8 This pin becomes the smoke integrator output. A high level indicates that an alarm condition has been detected. LED 11 The LED pin is used as a low battery indicator. For VDD above the low battery threshold, the open drain NMOS is off. If VDD falls below the threshold, the NMOS turns on. DS22181C-page 10 Function 2009-2012 Microchip Technology Inc. RE46C145 Standby, No Alarm (not to scale) Oscillator TPOSC TPWOSC Internal Clock TON1 TPER1 STROBE TON2 IRED TPLED1 LED Low Supply or Chamber Test Failure LED THON3 Low BatteryTest Low BatteryWarning Chirp Low Battery Warning Chirp Horn THOF3 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. DS22181C-page 11 RE46C145 Local Alarm Timing (not to scale) TPER2 STROBE IRED TPLED2 LED No Alarm Local or Remote Alarm No Alarm Horn Temporal Pattern THON1 THOF1 THOF2 Horn Interconnect Timing TIODLY1 IO as Output TIOFILT TIODLY2 IO as Input 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. 3: IO Dump active only in local alarm, inactive if external alarm. FIGURE 3-2: DS22181C-page 12 RE46C145 Timing Diagram – Local Alarm, Horn and Interconnect Timings. 2009-2012 Microchip Technology Inc. RE46C145 4.0 PACKAGING INFORMATION 4.1 Package Marking Information 16-Lead PDIP (300 mil) Example RE46C145-V/P^^ e3 1220256 16-Lead Narrow SOIC (3.90 mm) Example RE46C145 V/SL^^ e3 1220256 16-Lead Wide SOIC (7.50 mm) Example RE46C145 V/SO^^ e3 1220256 Legend: XX...X Y YY WW NNN e3 * Note: Customer-specific information Year code (last digit of calendar year) Year code (last 2 digits of calendar year) Week code (week of January 1 is week ‘01’) Alphanumeric traceability code Pb-free JEDEC designator for Matte Tin (Sn) This package is Pb-free. The Pb-free JEDEC designator ( e3 ) can be found on the outer packaging for this package. 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. 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RE46C145 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. DS22181C-page 15 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. RE46C145 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. DS22181C-page 17 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. RE46C145 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. DS22181C-page 19 RE46C145 /HDG3ODVWLF6PDOO2XWOLQH62±:LGHPP%RG\>62,&@/DQG3DWWHUQ 1RWH )RUWKHPRVWFXUUHQWSDFNDJHGUDZLQJVSOHDVHVHHWKH0LFURFKLS3DFNDJLQJ6SHFLILFDWLRQORFDWHGDW KWWSZZZPLFURFKLSFRPSDFNDJLQJ DS22181C-page 20 2009-2012 Microchip Technology Inc. RE46C145 APPENDIX A: REVISION HISTORY Revision C (August 2012) The following is the list of modifications: 1. 2. 3. 4. 5. 6. Re-structured the entire document. Moved Functional Block Diagram and Typical Application figures to the front pages. Added Temperature Characteristics table. Reorganized Section 2.0, Pin Description. Simplified Table 2-1, added description sections. Added Section 4.0, Packaging Information. Added Product Identification System section. Revision B (October 2009) • Undocumented changes. Revision A (May 2009) • Original Release of this Document. 2009-2012 Microchip Technology Inc. DS22181C-page 21 RE46C145 NOTES: DS22181C-page 22 2009-2012 Microchip Technology Inc. RE46C145 PRODUCT IDENTIFICATION SYSTEM To order or obtain information, e.g., on pricing or delivery, refer to the factory or the listed sales office. PART NO. XX /X Device Package Number of Pins Device RE46C145: RE46C145T: Package E S = = SW = CMOS Photoelectric Smoke Detector ASIC CMOS Photoelectric Smoke Detector ASIC (Tape and Reel, SOIC only) Examples: a) b) c) RE46C145E16F: RE46C145S16F: RE46C145S16TF: d) e) RE46C145SW16F: RE46C145SW16TF: 16LD PDIP Package 16LD SOIC Package 16LD SOIC Package, Tape and Reel 16LD SOIC Package 16LD SOIC Package, Tape and Reel Plastic Dual In-Line, 300 mil. Body, 16-Lead (PDIP) Small Plastic Outline - Narrow, 3.90 mm Body, 16-Lead (SOIC) Small Plastic Outline - Wide, 7.50 mm Body, 16-Lead (SOIC) 2009-2012 Microchip Technology Inc. DS22181C-page 23 RE46C145 NOTES: DS22181C-page 24 2009-2012 Microchip Technology Inc. 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Code protection does not mean that we are guaranteeing the product as “unbreakable.” Code protection is constantly evolving. We at Microchip are committed to continuously improving the code protection features of our products. Attempts to break Microchip’s code protection feature may be a violation of the Digital Millennium Copyright Act. If such acts allow unauthorized access to your software or other copyrighted work, you may have a right to sue for relief under that Act. Information contained in this publication regarding device applications and the like is provided only for your convenience and may be superseded by updates. It is 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, STATUTORY OR OTHERWISE, RELATED TO THE INFORMATION, INCLUDING BUT NOT LIMITED TO ITS CONDITION, QUALITY, PERFORMANCE, MERCHANTABILITY OR FITNESS FOR PURPOSE. Microchip disclaims all liability arising from this information and its use. Use of Microchip devices in life support and/or safety applications is entirely at the buyer’s risk, and the buyer agrees to defend, indemnify and hold harmless Microchip from any and all damages, claims, suits, or expenses resulting from such use. No licenses are conveyed, implicitly or otherwise, under any Microchip intellectual property rights. Trademarks The Microchip name and logo, the Microchip logo, dsPIC, KEELOQ, KEELOQ logo, MPLAB, PIC, PICmicro, PICSTART, PIC32 logo, rfPIC and UNI/O are registered trademarks of Microchip Technology Incorporated in the U.S.A. and other countries. FilterLab, Hampshire, HI-TECH C, Linear Active Thermistor, MXDEV, MXLAB, SEEVAL and The Embedded Control Solutions Company are registered trademarks of Microchip Technology Incorporated in the U.S.A. Analog-for-the-Digital Age, Application Maestro, chipKIT, chipKIT logo, CodeGuard, dsPICDEM, dsPICDEM.net, dsPICworks, dsSPEAK, ECAN, ECONOMONITOR, FanSense, HI-TIDE, In-Circuit Serial Programming, ICSP, Mindi, MiWi, MPASM, MPLAB Certified logo, MPLIB, MPLINK, mTouch, Omniscient Code Generation, PICC, PICC-18, PICDEM, PICDEM.net, PICkit, PICtail, REAL ICE, rfLAB, 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.S.A., All Rights Reserved. Printed on recycled paper. ISBN: 978-1-62076-468-8 QUALITY MANAGEMENT SYSTEM CERTIFIED BY DNV == ISO/TS 16949 == 2009-2012 Microchip Technology Inc. Microchip received ISO/TS-16949:2009 certification for its worldwide headquarters, design and wafer fabrication facilities in Chandler and Tempe, Arizona; Gresham, Oregon and design centers in California and India. The Company’s quality system processes and procedures are for its PIC® MCUs and dsPIC® DSCs, KEELOQ® code hopping devices, Serial EEPROMs, microperipherals, nonvolatile memory and analog products. In addition, Microchip’s quality system for the design and manufacture of development systems is ISO 9001:2000 certified. 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