RE46C144S16TF

RE46C144 CMOS Photoelectric Smoke Detector ASIC with Interconnect and Timer Mode Features General Description • • • • • • • • • The RE46C144 is a low-power, CMOS photoelectrictype 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 75% Duty Cycle Horn Pattern Internal Low Battery and Chamber Test Compatible with Allegro A5358 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. 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 RE46C144 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 DS22180C-page 1 RE46C144 Functional Block Diagram VDD (5) Low Battery + - IO (7) HS (9) + - VSEN (15) FEED (10) Horn Driver Smoke Comparator Logic and Timing HB (8) LED (11) VDD-3.5V PHOTOAMP DETECT (3) Bias and Power Reset + - C1 (1) IRED (6) C2 (2) ROSC (13) Oscillator COSC (12) VDD-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 5 12 6 11 7 10 R7 22 8 To Other Units 9 R8 330 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. DS22180C-page 2  2009-2012 Microchip Technology Inc. RE46C144 1.0 ELECTRICAL CHARACTERISTICS 1.1 Absolute Maximum Ratings† VDD....................................................................................15V Input Voltage Range Except FEED, IO .......... VIN = -.3V to VDD +.3V † 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. 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. Parameter Symbol Test Pin Supply Voltage VDD Supply Current IDD1 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 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 IIFD 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. DS22180C-page 3 RE46C144 DC ELECTRICAL CHARACTERISTICS (CONTINUED) DC Electrical Characteristics: Unless otherwise indicated, all parameters apply at TA = -25°C to +75°C, VDD = 9V. Parameter Symbol Test Pin Min. Typ. Max. Units Input Leakage High IIH1 1, 2 — — 100 nA Conditions 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 IPDIO2 7 — — 140 µA VIN = 15V, VDD = 12V 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 Input Pull Down Current VOL2 13 — .5 — V Iol = 5 mA, VDD = 6.5V VOL3 11 — — .6 V Iol = 10 mA, VDD = 6.5V Output Voltage High VOH1 8, 9 5.5 — 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, VIO = 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 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 Compare 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 – 5.25 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. DS22180C-page 4  2009-2012 Microchip Technology Inc. RE46C144 TABLE 1-1: 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. Symbol Test Pin Min Typ Max Units 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 .6 .67 .74 s Local alarm condition TPLED3 11 9.6 10.75 11.8 s Timer mode, no local alarm TPLED4 11 s Remote alarm only TPER1 4, 6 9.6 10.75 11.8 s Standby, no alarm TPER1A 4, 6 2.42 2.7 2.96 s Standby, after one valid smoke sample TPER1B 4, 6 1.21 1.33 1.47 s Standby, after two consecutive valid smoke samples TPER2 4, 6 1.21 1.33 1.47 s In Local Alarm (three consecutive valid smoke samples) TPER3 4, 6 9.7 10.5 11.8 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, 9 227 252 277 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 76 84 92 ms 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 .91 1.46 s At conclusion of local alarm or test IO Delay TIODLY1 7 s From start of local alarm to IO Active IO Filter TIOFILT 7 600 ms IO pulse-width ensured to be filtered. IO as input, no local alarm Remote Alarm Delay TIODLY2 7 1.65 s No local alarm, from IO Active to Horn Active 10 Min Parameter Oscillator Period LED and STROBE On Time LED Period STROBE and IRED Pulse Period Horn Off Time Timer Period Note 1: 2: 3: 4: 5: TTPER LED IS NOT ON 0 .75 7 8.5 Conditions Standby, no alarm 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 guaranteed by functional testing. 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. DS22180C-page 5 RE46C144 TEMPERATURE CHARACTERISTICS Electrical Specifications: Unless otherwise indicated, VDD = 9V, VSS = 0V Parameters Symbol 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 DS22180C-page 6  2009-2012 Microchip Technology Inc. RE46C144 2.0 PIN DESCRIPTION The descriptions of the pins are listed in . TABLE 2-1: PIN FUNCTION TABLE RE46C144 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 the 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