PDF RE46C127 Data sheet ( Hoja de datos )

Número de pieza	RE46C127
Descripción	CMOS Ionization Smoke Detector ASIC
Fabricantes	R & E International
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No Preview Available ! www.DataSheet4U.com R&E International RE46C127 CMOS Ionization Smoke Detector ASIC with Interconnect and Timer Mode Product Specification General Description The RE46C127 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. A 2/3 duty cycle continuous horn pattern is used for the alarm condition. An interconnect pin allows multiple detectors to be connected such that when one units alarms all units will sound. An internal 8 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 RE46C127 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 • 8 Minute Timer for Sensitivity Control • Compatible with Allegro A5348 • Available in Standard Packaging or RoHS Compliant Pb Free Packaging. Pin Configuration TSTART IO LBADJ TSTROBE LED VDD RBIAS FEED 1 2 3 4 5 6 7 8 16 GUARD2 15 DETECT 14 GUARD1 13 VSEN 12 OSCAP 11 HS 10 HB 9 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 Facsimile 610.992.0734 E-mail: [email protected] Page 1 of 9 DS-RE46C127-121806 This datasheet contains PROPRIETARY and CONFIDENTIAL information. 1 page RE46C127 CMOS Ionization Smoke Detector ASIC with Interconnect and Timer Mode 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 nominal digital filter. This allows for interconnection to other types of alarms (carbon monoxide for example) that may have a pulsed interconnect signal. Testing – At power up all internal registers are reset. The low battery set point can be tested at power up by holding FEED and OSCAP low at power up. HB will change state as VDD passes through the low battery set point. 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 an 8 minute timer. During this 8 minute nominal 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 Facsimile 610.992.0734 E-mail: [email protected] Page 5 of 9 DS-RE46C127-121806 This datasheet contains PROPRIETARY and CONFIDENTIAL information. 5 Page

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