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| R&E International RE46C129 CMOS Ionization Smoke Detector ASIC with Interconnect Product Specification General Description The RE46C129 is low power CMOS ionization type smoke detector IC. With few external components this circuit will provide all the required features for an ionization type smoke detector. An internal oscillator strobes power to the smoke detection circuitry for 10.5mS every 1.66 seconds to keep standby current to a minimum. A check for a low battery condition is performed every 40 seconds when in standby. An interconnect pin allows multiple detectors to be connected such that when one units alarms all units will sound. Although this device was designed for smoke detection utilizing an ionization chamber it could be used in a variety of security applications. Utilizing low power CMOS technology the RE46C129 was designed for use in smoke detectors that comply with Underwriters Laboratory Specification UL217 and UL268. Features * * * * * * * * * * Guard Outputs for Ion Detector Input +/-0.75pA Detect Input Current Internal Reverse Battery Protection Low Quiescent Current Consumption (<6.5uA) Available in 16L PDIP or 16L N SOIC ESD Protection on all Pins Internal Low Battery Detection Interconnect up to 40 Detectors Compatible with Allegro A5350 Available in Standard Packaging or RoHS Compliant Pb Free Packaging. Pin Configuration NC IO LBADJ NC LED VDD RBIAS FEED 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 GUARD2 DETECT GUARD1 VSEN OSCAP HS HB VSS ABSOLUTE MAXIMUM RATINGS PARAMETER Supply Voltage Input Voltage Range Except FEED, IO FEED Input Voltage Range IO Input Voltage Range Reverse Battery Time Input Current except FEED Operating Temperature Storage Temperature Maximum Junction Temperature SYMBOL VDD Vin Vinfd Vio1 TRB Iin TA TSTG TJ VALUE 15 -.3 to Vdd +.3 -10 to +22 -.3 to 17 5 10 -10 to 60 -55 to 125 150 UNITS V V V V S mA C C C 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. Telephone 610.992.0727 Page 1 of 8 E-mail: rande@randeint.com DS-RE46C129-121806 This datasheet contains PROPRIETARY and CONFIDENTIAL information. Facsimile 610.992.0734 RE46C129 CMOS Ionization Smoke Detector ASIC with Interconnect Product Specification R&E International DC Electrical Characteristics at TA = 25C, VDD=9V, OSCAP=.1uF, RBIAS=8.2M, VSS=0V (unless otherwise noted) Test Pin 6 6 6 8 2 8 2 15 15 8 15 15 8 2 5 10,11 10,11 5 2 2 2 6 3 14,15 15,16 13,15 14,15 13,15 14,16 Guard Amplifier Guard Amplifier Smoke Comparator Guard Amplifier, Note 2 Smoke Comparator, Note 2 Guard Amplifier Outputs, Note 2 Parameter Supply Voltage Supply Current Symbol VDD IDD1 IDD2 VIH1 VIH2 VIL1 VIL2 ILDET1 ILDET2 ILFD Test Conditions Operating RBIAS=8.2M, OSCAP=.1uF RBIAS=8.2M, OSCAP=.1uF;Vdd=12V Min 6 Limits Typ Max 12 4 6.5 9 Units V uA uA V V Input Voltage High FEED Input No Local Alarm, IO as an Input FEED Input No Local Alarm, IO as an Input VDD=9V, DETECT=VSS, 0-40% RH VDD=9V, DETECT=VSS, 85% RH Note 1 FEED=-10V VDD=9V, DETECT=VDD, 0-40% RH VDD=9V, DETECT=VDD, 85% RH Note 1 FEED=22V No Alarm, Vio=17V Outputs Off IOH=-16mA, VDD=7.2V IOL=16mA, VDD=7.2V IOL=10mA, VDD=7.2V No Alarm, Vio=Vdd-2V Alarm, Vio=Vdd-2V or Vio=0V At Conclusion of Local Alarm or Test, Vio=1V TA=-10 to 60C, Note 3 6.3 3 2.7 1 -0.75 -1.50 -50 0.75 1.50 50 150 1 6.3 .9 1 25 -4 5 7.2 -50 -50 -50 2 .5 Input Voltage Low V V pA pA uA pA pA uA uA uA V V V uA mA mA Input Leakage Low Input Leakage High IHDET1 IHDET2 IHFD IIOL2 Output Off Leakage High Output High Voltage Output Low Voltage IIOHZ VOH1 VOL1 VOL3 IIOL1 IIOH1 IIODMP Output Current 100 -16 Low Battery Voltage Internal Sensitivity Set Voltage Offset Voltage VLB VSET2 VGOS1 VGOS2 VGOS3 7.5 65.5 7.8 50 50 50 VDD-.5 VDD-2 V %VDD mV mV mV V V k Common Mode Voltage VCM1 VCM2 ZOUT Output Impedance 10 Note 1: Sample test only Note 2: Not 100% production tested Note 3: Production test at room with temperature guardbanded limits. Telephone 610.992.0727 Page 2 of 8 E-mail: rande@randeint.com DS-RE46C129-121806 This datasheet contains PROPRIETARY and CONFIDENTIAL information. Facsimile 610.992.0734 RE46C129 CMOS Ionization Smoke Detector ASIC with Interconnect Product Specification R&E International AC Electrical Characteristics at TA = 25C, VDD=9V, OSCAP=.1uF, RBIAS=8.2M, VSS=0V (unless otherwise noted) Test Pin 12 12 5 5 5 5 10,11 10,11 10,11 10,11 2 2 2 2 Parameter Oscillator Period Symbol TPER1 TPER2 TPW TLON TLOF1 TLOF2 THON1 THON2 THOF1 THOF3 TIODMP TIODLY1 TIOFILT TIODLY2 Test Conditions No Alarm Condition Alarm Condition Operating Operating Standby, No Alarm Alarm Condition Operating, Alarm Condition Low Battery, No Alarm Operating, Alarm Condition Low Battery, No Alarm At Conclusion of Local Alarm or Test From Start of Local Alarm to IO Active IO pulse width guaranteed to be filtered. IO as Input, No Local Alarm No Local Alarm, IO as input, From IO active to Horn Active Min 1.34 37.5 9.4 9.4 32 .8 141 9.4 71 32 1.34 Limits Typ Max 1.67 41.5 10.5 10.5 40 1 166 10.5 83 40 1.67 3 450 2 45.8 12.9 12.9 48 1.2 190 12.9 95 48 2.0 Units S mS mS mS S S mS mS mS S S S mS S Oscillator Pulse Width LED On Time LED Off Time Horn On Time Horn Off Time IO Charge Dump Duration IO Delay IO Filter Remote Alarm Delay .450 2.2 Telephone 610.992.0727 Page 3 of 8 E-mail: rande@randeint.com DS-RE46C129-121806 This datasheet contains PROPRIETARY and CONFIDENTIAL information. Facsimile 610.992.0734 RE46C129 CMOS Ionization Smoke Detector ASIC with Interconnect Product Specification R&E International Functional Block Diagram Telephone 610.992.0727 Page 4 of 8 E-mail: rande@randeint.com DS-RE46C129-121806 This datasheet contains PROPRIETARY and CONFIDENTIAL information. Facsimile 610.992.0734 RE46C129 CMOS Ionization Smoke Detector ASIC with Interconnect Product Specification R&E International DEVICE DESCRIPTION and APPLICATION NOTES Internal Timing - With external components as indicated on the application drawing the period of the oscillator is nominally 1.67 seconds in standby. Every 1.66 seconds the detection circuitry is powered up for 10.5mS and the status of the smoke comparator is latched. In addition every 40 seconds the LED driver is turned on for 10.5mS and the status of the low battery comparator is latched. The smoke comparator status is not checked during the low battery test, during the low battery horn warning chirp, or when the horn is on due to an alarm condition. If an alarm condition is detected the oscillator period increases to 41.5mS. In any alarm condition the horn is on for 166mS and off for 83mS (typical). Due to the low currents used in the oscillator the capacitor on pin 12 should be a low leakage type. Oscillator accuracy will depend mainly on the tolerance of the RBIAS resistor and OSCAP capacitor. Smoke Detection Circuit - The smoke comparator compares the ionization chamber voltage to a voltage derived from a resistor divider across VDD. This divider voltage must be provided externally on pin 13 (VSEN). See the application drawing (FIG 2). The guard amplifier and outputs are always active and will be within 50mV of the DETECT input to reduce surface leakage. The guard outputs also allow for measurement of the DETECT input without loading the ionization chamber. Low Battery Detection - An internal reference is compared to the voltage divided VDD supply. The battery can be checked under load via the LED low side driver output since low battery status is latched at the end of the 10.5mS LED pulse. Pin 3 (LBADJ) can be used to modify the low battery set point by placing a resistor to VDD or VSS. The transmission switch on LBADJ is turned on during the LED pulse so an external resistance can be added on pin 3 to modify the set point if desired. LED Pulse - The LED is pulsed on for 10.5mS every 40S in standby. In alarm the LED is pulsed on for 10.5mS every 1S. Interconnect - Pin 2 (IO) provides the capability to common many detectors in a single system. If a single unit goes into alarm the IO pin is driven high. This high signal causes the interconnected units to alarm. The LED flashes every 1S for 10.5mS on the signaling unit and is inhibited on the units that are in alarm due to the active IO signal. An internal sink device on the IO pin helps to discharge the interconnect line. This charge dump device is active for 1 clock cycle after the unit exits a local alarm condition (1.67S). The interconnect input has a 500mS nominal digital filter which will filter out pulsed signals on the IO pin. This allows for interconnection to other types of alarms (carbon monoxide for example) that may have a pulsed interconnect signal. This filter will eliminate unwanted random horn activations caused by a pulsed (<500ms nominal) IO input signal. Testing - By holding pin 12 (OSCAP) low the internal power strobe is active. Functional testing can be accelerated by driving pin 12 with a 4kHZ square wave however the 10.5mS strobe period must be maintained for proper operation of the analog circuitry. Please refer to the timing diagrams. All internal timing is reset after a power up. By holding pins 8 and 12 low, reducing VDD and monitoring Pin 10 the low battery trip level can be measured at power up. Telephone 610.992.0727 Page 5 of 8 E-mail: rande@randeint.com DS-RE46C129-121806 This datasheet contains PROPRIETARY and CONFIDENTIAL information. Facsimile 610.992.0734 RE46C129 CMOS Ionization Smoke Detector ASIC with Interconnect Product Specification R&E International Typical Application Figure 2 Notes: 1) C2 should be located as close as possible to the device power pins. 2) Select R8 and R9 to set the smoke chamber sensitivity. 3) Low battery trip can be modified by external resistance on pin 3, see device description. Telephone 610.992.0727 Page 6 of 8 E-mail: rande@randeint.com DS-RE46C129-121806 This datasheet contains PROPRIETARY and CONFIDENTIAL information. Facsimile 610.992.0734 RE46C129 CMOS Ionization Smoke Detector ASIC with Interconnect Product Specification R&E International Timing Diagram Pin 15 < Pin 13 Pin 15 > Pin 13 Pin 15 < Pin 13 TPER1 TPW Internal Clock 24 Clock Cycles (40 S) 24 Clock Cycles (1S) Ouput High Z LED Sample Smoke THON1 THOF1 Low Battery Warning Chirp Horn TIODLY1 IO (Pin 2) as Output IO Charge Dump TIOFILT Timing not same scale as above IO ( Pin 2) as Input TIODLY2 LED supressed in remote alarm mode Horn Start of horn pattern is not synchronized to an external alarm Horn pattern not self completing for external alarm Internal Clock Notes: 1. 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. Telephone 610.992.0727 Page 7 of 8 E-mail: rande@randeint.com DS-RE46C129-121806 This datasheet contains PROPRIETARY and CONFIDENTIAL information. Facsimile 610.992.0734 RE46C129 CMOS Ionization Smoke Detector ASIC with Interconnect Product Specification R&E International R&E INTERNATIONAL, Inc. reserves the right to make changes without further notice to any products herein to improve reliability, function or design. R&E INTERNATIONAL, Inc. does not assume any liability arising out of the application or use of any product or circuit described herein; neither does it convey any license under its patent rights, nor the rights of others. R&E INTERNATIONAL, Inc. products are not authorized for use as critical components in life support devices or systems without the express written approval of the President of R&E INTERNATIONAL, Inc. Life support devices or systems are devices or systems which are intended for surgical implant into the body to support or sustain life, and whose failure to perform, when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. Telephone 610.992.0727 Page 8 of 8 E-mail: rande@randeint.com DS-RE46C129-121806 This datasheet contains PROPRIETARY and CONFIDENTIAL information. Facsimile 610.992.0734 |
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