RE46C146

R&E International A Subsidiary of Microchip Technology Inc. RE46C146 CMOS Photoelectric Smoke Detector ASIC with Intelligent Interconnect and Timer Mode Product Specification General Description The RE46C146 is 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 100us 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 the diagnostic mode the photo amplifier output is available on pin 15 for production calibration of the photo chamber. A check for a low battery condition and chamber integrity is performed every 43 seconds when in standby. The temporal horn pattern for a smoke alarm condition 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. The interconnect is compatible with certain types of CO interconnect signaling and when recognized will sound the temporal pattern for a carbon monoxide alarm. An internal 10 minute timer can be used for a reduced sensitivity mode. • • • • • • • • • • • Internal Power On Reset Low Quiescent Current Consumption Available in 16L PDIP or 16L N SOIC ESD Protection on all Pins Interconnect up to 40 Detectors 10 Minute Timer for Sensitivity Control Temporal Horn Pattern for Smoke and CO Internal Low Battery and Chamber Test Compatible with Allegro A5366 Alternate Diagnostic Mode Available in Standard Packaging or RoHS Compliant Pb Free Packaging Pin Configuration C1 C2 DETECT STROBE VDD IRED IO HORNB 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 TEST VSEN VSS ROSC COSC LED FEED HORNS Utilizing low power CMOS technology the RE46C146 was designed for use in smoke detectors that comply with Underwriters Laboratory Specification UL217 and UL268. Features ABSOLUTE MAXIMUM RATINGS PARAMETER Supply Voltage Input Voltage Range Except FEED, IO FEED Input Voltage Range IO Input Voltage Range Input Current except FEED Operating Temperature Storage Temperature Maximum Junction Temperature © 2009 Microchip Technology Inc. SYMBOL VDD Vin Vinfd Vio1 Iin TA TSTG TJ VALUE 12.5 -.3 to Vdd +.3 -10 to +22 -.3 to 17 10 -25 to 75 -55 to 125 150 UNITS V V V V mA °C °C °C DS22176A-page 1 RE46C146 CMOS Photoelectric Smoke Detector ASIC with Intelligent IO and Timer Mode Product Specification R&E International A Subsidiary of Microchip Technology Inc. Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only and operation at these conditions for extended periods may affect device reliability. This product utilizes CMOS technology with static protection; however proper ESD prevention procedures should be used when handling this product. Damage can occur when exposed to extremely high static electrical charge. DC Electrical Characteristics at TA = -25° to 75°C, VDD=9V, Typical Application (unless otherwise noted) Parameter Supply Voltage Supply Current Symbol VDD IDD1 IDD2 IDD3 IDD4 Test Pin 5 5 5 5 5 10 7 15 16 10 7 15 16 1,2,3 12 15,16 10 1,2 3,12 10 16 15 7 7 11,13 11,13 Test Conditions Operating Configured as in Figure 2, COSC=VSS Configured as in Figure 2, VDD=12V, COSC=VSS Configured as in Figure 2, STROBE on, IRED off, VDD=12V Configured as in Figure 2, STROBE on, IRED on, VDD=12V FEED No Local Alarm, IO as an Input VSEN TEST FEED No Local Alarm, IO as an Input VSEN TEST VDD=12V, COSC=12V, STROBE active VDD=12V, Vin=VSS VDD=12V, Vin=VSS FEED=-10V VDD=12V, Vin=VDD, STROBE active VDD=12V, Vin=VDD FEED=22V Vin=VDD Vin=VDD Vin=VDD Vin=17V, VDD=12 Output Off, Output=VSS Output Off, Output=VDD Min 6 Limits Typ Max 12 4 5.5 6 8 2 3 Units V uA uA mA mA V V V V Input Voltage High VIH1 VIH2 VIH3 VIH4 6.2 3.2 1.6 8.5 4.5 Input Voltage Low VIL1 VIL2 VIL3 VIL4 4.5 2.7 1.5 .5 7 -100 -100 -1 -50 100 100 50 V V V V nA nA uA uA nA nA uA uA uA uA uA uA uA Input Leakage Low IIL1 IIL2 IIL3 ILFD Input Leakage High IIH1 IIH2 IHFD Input Pull Down Current IPD1 IPD2 IPDIO1 IPDIO2 .25 .1 20 .25 10 .5 80 140 -1 1 Output Leakage Current Low Output Leakage Current High IOZL1 IOZH1 © 2009 Microchip Technology Inc. DS22176A-page 2 RE46C146 CMOS Photoelectric Smoke Detector ASIC with Intelligent IO and Timer Mode Product Specification R&E International A Subsidiary of Microchip Technology Inc. DC Electrical Characteristics (continued) at TA= -25° to 75°, VDD=9V, Typical Application (unless otherwise noted) Parameter Output Voltage Low Symbol VOL1 VOL2 VOL3 Test Pin 8,9 13 11 8,9 7 7 5 4 4 6 6 1,2,3 4 6 4,5 6,5 Test Conditions Iol=16mA, VDD=6.5V Iol=5mA, VDD=6.5V Iol=10mA, VDD=6.5V Iol=-16mA, VDD=6.5V Alarm, Vio=Vdd-2V or Vio=0V At Conclusion of Local Alarm or Test, Vio=1V STROBE off, VDD=12V, Iout=-1uA STROBE on, VDD=9V Iout= 100uA to 500uA IRED off, VDD=12V, Iout=1uA IRED on, VDD=9V Iout=0 to -6mA, Ta=25C Local smoke, Push to Test or Chamber Test, Note 1 Internal Reference VDD=6V to 12V, STROBE Output Voltage VDD=6V to 12V, IRED Output Voltage Active, VDD=6V to 12V Active, VDD=6V to 12V Min Limits Typ Max 1 .5 1 Units V V V V mA mA Output Voltage High Output Current VOh1 IIOH1 IIODMP 5.5 -4 5 6.9 11.9 VDD 5.3 2.25 .5 VDD3.85 .01 .3 -50 -30 VDD 5 3.1 VDD 4.7 .1 3.75 VDD-2 VDD3.15 7.2 7.5 -16 Low Battery Alarm Voltage Output Voltage VLB VSTOF VSTON VIREDOF VIREDON V V V V V V V %/ºC %/ºC dB dB Common Mode Voltage Smoke Compare Reference Temperature Coefficient VCM1 Vref TCST TCIRED Line Regulation ΔVSTON ΔVIREDON Note 1: Not production tested Typical values are for design information and are not guaranteed. Limits over the specified temperature range are not production tested and are based on characterization data. © 2009 Microchip Technology Inc. DS22176A-page 3 RE46C146 CMOS Photoelectric Smoke Detector ASIC with Intelligent IO and Timer Mode Product Specification R&E International A Subsidiary of Microchip Technology Inc. AC Electrical Characteristics at TA =-25° to 75°, VDD=9V, VSS=0V, Component Values from Figure 2 ; R9=100KΩ, R12=10MΩ, C5= 1.5nF(unless otherwise noted) Test Pin 12 11,4 11 11 11 11 4 4 4 4 4 4 6 8,9 8,9 8,9 8,9 8,9 8,9 8,9 8,9 7 7 7 7 7 Parameter Oscillator Period LED and STROBE On Time LED Period Symbol TPOSC TON1 TPLED1 TPLED2 TPLED3 TPLED4 Test Conditions No Alarm Condition Operating Standby, No Alarm Local Alarm Condition Timer Mode, No Local Alarm Remote Alarm Only Standby, No Alarm Standby, After 1 Valid Smoke Sample Standby, After 2 Consecutive Valid Smoke Samples In Local Alarm – (3 Consecutive Valid Smoke Samples) In Remote Alarm Pushbutton Test Operating Operating, Alarm Condition, Note 1 Low Battery or Failed Chamber Test , No Alarm Operating, CO Interconnect Alarm Condition, Note 1 Operating, Alarm Condition, Note 1 Operating, Alarm Condition, Note 1 Low Battery or Failed Chamber Test, No Alarm Operating, CO Interconnect Alarm Condition, Note 1 Operating, CO Interconnect Alarm Condition, Note 1 From Start of Local Alarm to IO Active No local alarm, 2 valid pulses required for CO IO=low At Conclusion of Local Alarm or Test No Local Alarm, From IO Active to Alarm No Alarm Condition Min 9.4 9.4 39 .45 9.6 9.6 1.8 .9 .9 7.2 300 94 450 9.4 90 450 1.35 39 90 4.59 Limits Typ Max 10.5 10.5 43 .5 10.75 10.75 2 1 1 8 336 104 500 10.5 100 500 1.5 43 100 5.1 0 11.5 11.5 47 .55 11.8 11.8 2.2 1.1 1.1 8.9 370 115 550 11.5 110 550 1.65 47 110 5.61 Units mS mS S S S S S S S S S mS uS mS mS mS mS S S mS S S LED IS NOT ON STROBE and IRED Pulse Period TPER1 TPER1A TPER1B TPER2 TPER3 TPER4 IRED On Time Horn On Time TON2 THON1 THON2 THON3 Horn Off Time THOF1 THOF2 THOF3 THOF4 THOF5 IO Delay IO Pulse on Time for CO Alarm IO Pulse Off Time for CO Alarm IO Charge Dump Duration Remote Alarm Delay Timer Period TIODLY1 TIOPW1 TIOTO1 TIODMP TIODLY2 TTPER 46.2 590 3.7 mS S S S Min 1.2 1.05 8 1.35 1.5 10 1.5 2.0 12 Note 1 – See timing diagram for smoke alarm Horn Temporal Pattern Typical values are for design information and are not guaranteed. Limits over the specified temperature range are not production tested and are based on characterization data. © 2009 Microchip Technology Inc. DS22176A-page 4 RE46C146 CMOS Photoelectric Smoke Detector ASIC with Intelligent IO and Timer Mode Product Specification R&E International A Subsidiary of Microchip Technology Inc. © 2009 Microchip Technology Inc. DS22176A-page 5 RE46C146 CMOS Photoelectric Smoke Detector ASIC with Intelligent IO and Timer Mode Product Specification R&E International A Subsidiary of Microchip Technology Inc. Functional Block Diagram Figure 1 © 2009 Microchip Technology Inc. DS22176A-page 6 RE46C146 CMOS Photoelectric Smoke Detector ASIC with Intelligent IO and Timer Mode Product Specification R&E International A Subsidiary of Microchip Technology Inc. PIN DESCRIPTIONS PIN# 1 PIN NAME C1 DESCRIPTION The capacitor connected to this 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 in pF. The gain should be