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| R&E International RE46C122 CMOS Ionization Smoke Detector ASIC with Interconnect and Timer Mode Preliminary Product Specification General Description The RE46C122 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. 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 allows for a separate button to be used for reduced sensitivity mode. 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 RE46C122 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 (<6uA) Available in 16L PDIP or 16L N SOIC ESD Protection on all Pins Internal Low Battery Detection Interconnect up to 40 Detectors 10 Minute Timer for Sensitivity Control Compatible with Allegro A5367 Pin Configuration TSTART IO LBADJ TSTROBE 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 FEED Input Voltage Range Reverse Battery Time Input Current except FEED Operating Temperature Storage Temperature Maximum Junction Temperature SYMBOL VDD Vin Vinfd TRB Iin TA TSTG TJ VALUE 15 -.3 to Vdd +.3 -10 to +22 5 10 -10 to 60 -55 to 125 150 UNITS 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 9 E-mail: rande@randeint.com DS-RE46C122-060104 This datasheet contains PROPRIETARY and CONFIDENTIAL information. Facsimile 610.992.0734 RE46C122 CMOS Ionization Smoke Detector ASIC with Interconnect and Timer Mode Preliminary 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 1 8 2 1 15 15 8 15 15 8 2 4,5 1 10,11 10,11 4 5 2 2 2 6 13 3 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 TSTART=9V IOH=-16mA, VDD=7.2V IOL=16mA, VDD=7.2V IOL=500ua 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 Parameter Supply Voltage Supply Current Symbol VDD IDD1 IDD2 VIH1 VIH2 VIH3 Test Conditions Operating RBIAS=8.2M, OSCAP=.1uF RBIAS=8.2M, OSCAP=.1uF;Vdd=12V Min 6 Limits Typ Max 12 4 6 9 Units V uA uA V V V Input Voltage High 6.2 No Local Alarm, IO as an Input 3 4.5 4.5 Input Voltage Low VIL1 VIL2 VIL3 4.5 No Local Alarm, IO as an Input 2.7 1 2.5 -0.75 -1.50 -50 0.75 1.50 50 150 1 V V V pA pA uA pA pA uA uA uA uA V V V V uA mA mA Input Leakage Low ILDET1 ILDET2 ILFD Input Leakage High IHDET1 IHDET2 IHFD IIOL2 Output Off Leakage High Input Pull Down Current Output High Voltage Output Low Voltage IIOHZ IPD1 VOH1 VOL1 VOL2 VOL3 20 6.3 50 80 .9 .5 1 Output Current IIOL1 IIOH1 IIODMP 25 -4 5 7.2 47 7.5 50 65.5 100 -16 Low Battery Voltage Internal Sensitivity Set Voltage VLB VSET1 VSET2 7.8 53 V %VDD %VDD Telephone 610.992.0727 Page 2 of 9 E-mail: rande@randeint.com DS-RE46C122-060104 This datasheet contains PROPRIETARY and CONFIDENTIAL information. Facsimile 610.992.0734 RE46C122 CMOS Ionization Smoke Detector ASIC with Interconnect and Timer Mode Preliminary Product Specification R&E International DC Electrical Characteristics - Continued Test Pin 14,15 15,16 14,15 14,15 13,15 6,8 13 Parameter Offset Voltage Symbol VGOS1 VGOS2 VGOS3 Test Conditions Guard Amplifier Guard Amplifier Smoke Comparator Guard Amplifier, Note 2 Smoke Comparator, Note 2 Guard Amplifier Outputs, Note 2 No Alarm to Alarm Condition Limits -50 -50 -50 2 .5 50 50 50 VDD-.5 VDD-2 mV mV mV V V k mV Common Mode Voltage VCM1 VCM2 ZOUT VHYS Output Impedance Hysteresis 10 90 130 170 Note 1: Sample test only Note 2: Not 100% production tested Note 3: Production test at room with temperature guardbanded limits. 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 5 10,11 10,11 10,11 10,11 10,11 2 2 2 Parameter Oscillator Period Symbol TPER1 TPER2 TPW TLON TLOF1 TLOF2 TLOF3 Test Conditions No Alarm Condition Alarm Condition Operating Operating Standby, No Alarm Alarm Condition Timer Mode, No Alarm Operating, Alarm Condition, Note 4 Low Battery, No Alarm Operating, Alarm Condition, Note 4 Operating, Alarm Condition, Note 4 Low Battery, No Alarm At Conclusion of Local Alarm or Test From Start of Local Alarm to IO Active Minimum Active Interconnect Signal to Cause a Remote Alarm. IO as Input, No Local Alarm No Alarm Min 1.34 37.5 9.4 9.4 32 .8 8 450 9.4 450 1.35 32 1.34 Limits Typ Max 1.67 41.5 10.5 10.5 40 1 10 500 10.5 500 1.5 40 1.67 3 2 45.8 12.9 12.9 48 1.2 12 550 12.9 550 1.65 48 2.0 Units S mS mS mS S S S mS mS mS S S S S S Oscillator Pulse Width LED On Time LED Off Time Horn On Time THON1 THON2 THOF1 THOF2 THOF3 Horn Off Time IO Charge Dump Duration IO Delay IO Active Time for Remote Alarm Timer Period TIODMP TIODLY TIOACT1 .45 .5 TTPER 4 8 10 12 Min Note 4 - See timing diagram for Horn Temporal Pattern Telephone 610.992.0727 Page 3 of 9 E-mail: rande@randeint.com DS-RE46C122-060104 This datasheet contains PROPRIETARY and CONFIDENTIAL information. Facsimile 610.992.0734 RE46C122 CMOS Ionization Smoke Detector ASIC with Interconnect and Timer Mode Preliminary Product Specification R&E International Functional Block Diagram Telephone 610.992.0727 Page 4 of 9 E-mail: rande@randeint.com DS-RE46C122-060104 This datasheet contains PROPRIETARY and CONFIDENTIAL information. Facsimile 610.992.0734 RE46C122 CMOS Ionization Smoke Detector ASIC with Interconnect and Timer Mode Preliminary 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. 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 is available externally on pin 13 (VSEN). When smoke is detected this voltage is internally increased by 130mV nominal to provide hysteresis and make the detector less sensitive to false triggering. Pin 13 (VSEN) can be used to modify the internal set point for the smoke comparator by use of external resistors to VDD or VSS. Nominal values for the internal resistor divider are indicated on the block diagram. These internal resistor values can vary by up to 20% but the resistor matching should be <2% on any one device. Transmission switches on VSEN and LBADJ prevent any interaction from the external adjustment resistors. 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. Transmission switches on VSEN and LBADJ prevent any interaction from external adjustment resistance. 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 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 the alarm condition (1.67S). The interconnect input has a 500mS maximum digital filter. This allows for interconnection to other types of alarms (carbon monoxide for example) that may have a pulsed interconnect 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. Timer Mode - The transition of pin 1 (TSTART) from a high to low level initiates a ten minute timer. During this 10 minute period the open drain NMOS on pin 4 (TSTROBE) is strobed on with the internal clock. A resistor connected to this pin could be used to modify the detector sensitivity for the timer period. Telephone 610.992.0727 Page 5 of 9 E-mail: rande@randeint.com DS-RE46C122-060104 This datasheet contains PROPRIETARY and CONFIDENTIAL information. Facsimile 610.992.0734 RE46C122 CMOS Ionization Smoke Detector ASIC with Interconnect and Timer Mode Preliminary Product Specification R&E International Typical Application Figure 2 Notes: The application of the internal 10 minute timer for reduced sensitivity as shown in Figure 2 may be covered by United States patent RE. 33920. C2 should be located as close as possible to the device power pins. Telephone 610.992.0727 Page 6 of 9 E-mail: rande@randeint.com DS-RE46C122-060104 This datasheet contains PROPRIETARY and CONFIDENTIAL information. Facsimile 610.992.0734 RE46C122 CMOS Ionization Smoke Detector ASIC with Interconnect and Timer Mode Preliminary Product Specification R&E International Timing Diagram (non Timer Mode) Standby M ode; No Low Battery; No Alarm Alarm; No Low Battery Alarm; Low Battery No Alarm; Low Battery Oscillator Pin 15 > Pin 13 Pin 13 > Pin 15; 130mV Level Shift on Pin 13 Pin 15 > Pin 13 1.67S 11mS Internal Clock 24 Clock Cycles (40 S) 24 Clock Cycles (1S) LED Sample Smoke Low Battery Warning Chirp Horn See Figure Below for Complete Horn Cycle TIODLY IO (Pin 2) as Output IO Charge Dump Timing not same scale as above IO ( Pin 2) as Input Horn LED supressed in remote alarm mode Start of horn temporal pattern is not synchronized to an external alarm Horn pattern not self completing for external alarm,see timing below for complete horn cycle Internal Clock Notes: 1. Smoke is not sampled w hen the horn is active. Horn cycle is self completing in local alarm. 2. Low battery w arning chirp is suppressed in local or remote alarm 3. IO Dump active only in local alarm, inactive if external alarm THON1 THOF1 THOF2 Complete Temporal Horn Pattern Telephone 610.992.0727 Page 7 of 9 E-mail: rande@randeint.com DS-RE46C122-060104 This datasheet contains PROPRIETARY and CONFIDENTIAL information. Facsimile 610.992.0734 RE46C122 CMOS Ionization Smoke Detector ASIC with Interconnect and Timer Mode Preliminary Product Specification R&E International Timing Diagram (Timer Mode) Oscillator 11mS 1.67S Internal Clock TSTART TLOF3 LED Outputs High Z TSTROBE TTPER Telephone 610.992.0727 Page 8 of 9 E-mail: rande@randeint.com DS-RE46C122-060104 This datasheet contains PROPRIETARY and CONFIDENTIAL information. Facsimile 610.992.0734 RE46C122 CMOS Ionization Smoke Detector ASIC with Interconnect and Timer Mode Preliminary 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 9 of 9 E-mail: rande@randeint.com DS-RE46C122-060104 This datasheet contains PROPRIETARY and CONFIDENTIAL information. Facsimile 610.992.0734 |
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