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| MOTOROLA SEMICONDUCTOR TECHNICAL DATA Freescale Semiconductor, Inc. Order this document by MC14468/D MC14468 Low-Power CMOS Ionization Smoke Detector IC with Interconnect The MC14468, when used with an ionization chamber and a small number of external components, will detect smoke. When smoke is sensed, an alarm is sounded via an external piezoelectric transducer and internal drivers. This circuit is designed to operate in smoke detector systems that comply with UL217 and UL268 specifications. * Ionization Type with On-Chip FET Input Comparator 16 1 P SUFFIX PLASTIC DIP CASE 648-08 Freescale Semiconductor, Inc... * Piezoelectric Horn Driver * Guard Outputs on Both Sides of Detect Input * Input-Production Diodes on the Detect Input * Low-Battery Trip Point, Internally Set, can be Altered Via External Resistor * Detect Threshold, Internally Set, can be Altered Via External Resistor * Pulse Testing for Low Battery Uses LED for Battery Loading * Comparator Output for Detect * Internal Reverse Battery Protection * Strobe Output for External Trim Resistors * I/O Pin Allows Up to 40 Units to be Connected for Common Signaling * Power-On Reset Prevents False Alarms on Battery Change ORDERING INFORMATION MC14468P PLASTIC DIP PIN ASSIGNMENT (16 PIN DIP) Detect Comp. Out I/O Low V Set Strobe Out LED VDD Timing Resistor Feedback 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 Guard Hi-Z Detect Input Guard Lo-Z Sensitivity Set Osc Capacitor Silver Brass VSS MAXIMUM RATINGS* (Voltages referenced to VSS) Rating DC Supply Voltage Input Voltage, All Inputs Except Pin 8 DC Current Drain per Input Pin, Except Pin 15 = 1 mA DC Current Drain per Output Pin Operating Temperature Range Storage Temperature Range Reverse Battery Time Symbol VDD Vin I I TA Tstg tRB *0.5 to + 15 *0.25 to VDD + 0.25 10 Value Unit V V mA mA C C s *10 to + 60 *55 to + 125 5.0 30 * Maximum Ratings are those values beyond which damage to the device may occur. This device contains circuitry to protect the inputs against damage due to high static voltages or electric fields; however, it is advised that normal precautions be taken to avoid application of any voltage higher than maximum rated voltages to this high impedance circuit. For proper operation (Vin or Vout) VDD. it is recommended that Vin and Vout be constrained to the range VSS v v REV 3 Motorola Sensor (c) Motorola, Inc. 2000 Device Data For More Information On This Product, Go to: www.freescale.com 1 MC14468 Parameter Supply Voltage Timing Capacitor Timing Resistor Battery Load (Resistor or LED) Freescale Semiconductor, Inc. Symbol VDD -- -- -- Value 9.0 0.1 8.2 10 Unit V F M mA RECOMMENDED OPERATING CONDITIONS (Voltages referenced to VSS) ELECTRICAL CHARACTERISTICS (TA = 25C) Characteristic Operating Voltage Output Voltage Piezoelectric Horn Drivers (IOH = mA) A) Comparators (IOH = Piezoelectric Horn Drivers (IOL = +16 mA) Comparators (IOL = +30 A) Symbol VDD VDD Vdc -- 7.2 9.0 7.2 9.0 7.2 9.0 9.0 9.0 12.0 9.0 9.0 -- 9.0 -- 9.0 9.0 9.0 Vin Cin Vcm IIH IOH -- -- -- -- -- Min 6.0 6.3 8.5 -- -- -- -- -- -- -- -- -- -- 7.2 47 75 -- -- VSS Typ# -- -- 8.8 -- 0.1 -- -- -- 5.0 -- -- -- -- -- 50 100 -- -- -- 5.0 -- -- -- Max 12 -- -- 0.9 0.5 3.0 10 1000 9.0 12.0 A pA A pA V %VDD mV mV Unit V V Freescale Semiconductor, Inc... *30 *16 VOH VOL VOL Lo-Z Hi-Z IDD Iin Iin Iin Vlow Vset vhys VOS V V k Output Voltage -- LED Driver, IOL = 10 mA Output Impedance, Active Guard Pin 14 Pin 16 Operating Current (Rbias = 8.2 M) Input Current -- Detect (40% R.H.) Input Current, Pin 8 Input Current @ 50C, Pin 15 Internal Set Voltage Low Battery Sensitivity Hysteresis Offset Voltage (measured at Vin = VDD/2) Active Guard Detect Comparator Input Voltage Range, Pin 8 Input Capacitance Common Mode Voltage Range, Pin 15 I/O Current, Pin 2 Input, VIH = VDD Output, VOH = VDD "1.0 "0.1 "6.0 7.8 53 150 *10 "100 "50 VDD + 10 -- VDD V pF V A mA -- 0.6 *2 *2 *2 *4.0 25 *16 100 # Data labelled "Typ'' is not to be used for design purposes but is intended as an indication of the IC's potential performance. 2 For More Information On This Product, Go to: www.freescale.com Motorola Sensor Device Data Freescale Semiconductor, Inc. TIMING PARAMETERS (C = 0.1 F, Rbias = 8.2 M, VDD = 9.0 V, TA = 25C, See Figure 6) Characteristics Oscillator Period Oscillator Rise Time Horn Output (During Smoke) LED Output Horn Output (During Low Battery) On Time Off Time Between Pulses On Time On Time Between Pulses No Smoke Smoke Symbol tCI tr PWon PWoff tLED PWon ton toff Min 1.34 32 8.0 120 60 32 8.0 8.0 32 Typ# 1.67 40 10 160 80 40 10 10 40 Max 2.0 48 12 208 104 48 12 12 48 MC14468 Units s ms ms ms ms s ms ms s # Data labelled "Typ'' is not to be used for design purposes but is intended as an indication of the IC's potential performance. Freescale Semiconductor, Inc... TO OTHER UNITS VDD VDD I/O FEEDBACK 2 8 45 K LOW BATTERY COMPARATOR 11 SILVER - LOW V SET DETECT COMPARATOR OUT 3 1 + 10 BRASS ALARM LOGIC 280 K 13 + - DETECT COMPARATOR POWER-ON RESET 325 K 15 DETECT INPUT GUARD AMP + - VDD = PIN 6 VSS = PIN 9 LO-Z 14 VDD HI-Z 16 OSC AND TIMING 5 LED STROBE OUT 4 12 7 VDD Figure 1. Block Diagram Motorola Sensor Device Data For More Information On This Product, Go to: www.freescale.com 3 MC14468 100.0 VDD = 9.0 Vdc ID , DRAIN CURRENT (mA) Freescale Semiconductor, Inc. 10.0 TA = 25C ID , DRAIN CURRENT (mA) VDD = 9.0 Vdc or 7.2 Vdc TA = 25C 10.0 VDD = 7.2 Vdc 1.0 1.0 0.1 P-CH SOURCE AND N-CH SINK CURRENT 0.1 0 1 2 3 4 5 6 7 8 9 10 VDS, DRAIN TO SOURCE VOLTAGE (Vdc) 0.01 0 1 2 3 4 5 6 7 8 9 10 VDS, DRAIN TO SOURCE VOLTAGE (Vdc) Freescale Semiconductor, Inc... Figure 2. Typical LED Output I-V Characteristic Figure 3. Typical Comparator Output I-V Characteristic 1000.0 TA = 25C ID , DRAIN CURRENT (mA) 1000.0 TA = 25C ID , DRAIN CURRENT (mA) VDD = 9.0 Vdc 100.0 VDD = 9.0 Vdc 100.0 VDD = 7.2 Vdc 10.0 N-CH SINK CURRENT 1.0 0 10.0 VDD = 7.2 Vdc P-CH SOURCE CURRENT 1.0 0 1 2 3 4 5 6 7 8 9 10 1 2 3 4 5 6 7 8 9 10 VDS, DRAIN TO SOURCE VOLTAGE (Vdc) VDS, DRAIN TO SOURCE VOLTAGE (Vdc) Figure 4. Typical P Horn Driver Output I-V Characteristic 4 For More Information On This Product, Go to: www.freescale.com Motorola Sensor Device Data Freescale Semiconductor, Inc. DEVICE OPERATION TIMING The internal oscillator of the MC14468 operates with a period of 1.67 seconds during no-smoke conditions. Each 1.67 seconds, internal power is applied to the entire IC and a check is made for smoke, except during LED pulse, Low Battery Alarm Chirp, or Horn Modulation (in smoke). Every 24 clock cycles a check is made for low battery by comparing VDD to an internal zener voltage. Since very small currents are used in the oscillator, the oscillator capacitor should be of a low leakage type. DETECT CIRCUITRY If smoke is detected, the oscillator period becomes 40 ms and the piezoelectric horn oscillator circuit is enabled. The horn output is modulated 160 ms on, 80 ms off. During the off time, smoke is again checked and will inhibit further horn output if no smoke is sensed. During local smoke conditions the low battery alarm is inhibited, but the LED pulses at a 1.0 Hz rate. In remote smoke, the LED is inhibited as well. An active guard is provided on both pins adjacent to the detect input. The voltage at these pins will be within 100 mV of the input signal. This will keep surface leakage currents to a minimum and provide a method of measuring the input voltage without loading the ionization chamber. The active guard op amp is not power strobed and thus gives constant protection from surface leakage currents. Pin 15 (the Detect input) has internal diode protection against static damage. INTERCONNECT The I/O (Pin 2), in combination with VSS, is used to interconnect up to 40 remote units for common signaling. A Local Smoke condition activates a current limited output driver, thereby signaling Remote Smoke to interconnected units. A small current sink improves noise immunity during non- smoke conditions. Remote units at lower voltages do not MC14468 draw excessive current from a sending unit at a higher voltage. The I/O is disabled for three oscillator cycles after power up, to eliminate false alarming of remote units when the battery is changed. SENSITIVITY/LOW BATTERY THRESHOLDS Both the sensitivity threshold and the low battery voltage levels are set internally by a common voltage divider (please see Figure 1) connected between VDD and VSS. These voltages can be altered by external resistors connected from pins 3 or 13 to either VDD or VSS. There will be a slight interaction here due to the common voltage divider network. The sensitivity threshold can also be set by adjusting the smoke chamber ionization source. TEST MODE Since the internal op amps and comparators are power strobed, adjustments for sensitivity or low battery level could be difficult and/or time-consuming. By forcing Pin 12 to VSS, the power strobing is bypassed and the output, Pin 1, constantly shows smoke/no smoke. Pin 1 = VDD for smoke. In this mode and during the 10 ms power strobe, chip current rises to approximately 50 A. LED PULSE The 9-volt battery level is checked every 40 seconds during the LED pulse. The battery is loaded via a 10 mA pulse for 10 ms. If the LED is not used, it should be replaced with an equivalent resistor such that the battery loading remains at 10 mA. HYSTERESIS When smoke is detected, the resistor/divider network that sets sensitivity is altered to increase sensitivity. This yields approximately 100 mV of hysteresis and reduces false triggering. Freescale Semiconductor, Inc... 1M 1M TEST 1 TO OTHER UNITS MC14468 2 3 4 5 330 6 7 0.1 F + 8.2 M 9V 8 16 15 14 13 12 11 10 9 *NOTE: Component values may change depending on type of piezoelectric horn used. 0.1 F 1.5 M* 0.001 F 220 k* Figure 5. Typical Application as Ionization Smoke Detector Motorola Sensor Device Data For More Information On This Product, Go to: www.freescale.com 5 MC14468 Standby No Smoke/ No Low Battery Freescale Semiconductor, Inc. Smoke/Low Battery Smoke/No Low Battery 40 ms 10 ms No Smoke/Low Battery 1.67 s Oscillator (Pin 12) Detect Out (Pin 1) Low Battery (Internal) Hysteresis (Internal) (Pin 13 ) (Pin 14) Sample (Internal) Smoke Low = Disable Horn High = Enable (Pin 10 and 11) (Note 1) Freescale Semiconductor, Inc... Battery Test LED (Pin 5) 24 Clock Cycles 24 Clock Cycles (0.96 s) (40S) (Note 3) Suppressed Chirp (Note 3) 24 Clock Cycles 6 Clock Cycles (10.0 s) Strobe Out (Pin 14) I/O (Pin 2) Output (Local) I/O (Pin 2) Input (Remote) LED (Suppressed LED for Remote Only) Note: Horn Modulation Not Self-Completing Figure 6. Timing Diagram NOTES: 1. Horn modulation is self-completing. When going from smoke to no smoke, the alarm condition will terminate only when horn is off. 2. Comparators are strobed on once per clock cycle (1.67 s for no smoke, 40 ms for smoke). 3. Low battery comparator information is latched only during LED pulse. 4. 100 mV p-p swing. X 6 For More Information On This Product, Go to: www.freescale.com Motorola Sensor Device Data Freescale Semiconductor, Inc. PACKAGE DIMENSIONS MC14468 -A- 16 9 NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: INCH. 3. DIMENSION L TO CENTER OF LEADS WHEN FORMED PARALLEL. 4. DIMENSION B DOES NOT INCLUDE MOLD FLASH. 5. ROUNDED CORNERS OPTIONAL. DIM A B C D F G H J K L M S INCHES MIN MAX 0.740 0.770 0.250 0.270 0.145 0.175 0.015 0.021 0.040 0.70 0.100 BSC 0.050 BSC 0.008 0.015 0.110 0.130 0.295 0.305 0_ 10 _ 0.020 0.040 MILLIMETERS MIN MAX 18.80 19.55 6.35 6.85 3.69 4.44 0.39 0.53 1.02 1.77 2.54 BSC 1.27 BSC 0.21 0.38 2.80 3.30 7.50 7.74 0_ 10 _ 0.51 1.01 B 1 8 F S C L -T- H K G D 16 PL SEATING PLANE Freescale Semiconductor, Inc... J TA M M 0.25 (0.010) M CASE 648-08 ISSUE R STYLE 1: PIN 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. CATHODE CATHODE CATHODE CATHODE CATHODE CATHODE CATHODE CATHODE ANODE ANODE ANODE ANODE ANODE ANODE ANODE ANODE STYLE 2: PIN 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. COMMON DRAIN COMMON DRAIN COMMON DRAIN COMMON DRAIN COMMON DRAIN COMMON DRAIN COMMON DRAIN COMMON DRAIN GATE SOURCE GATE SOURCE GATE SOURCE GATE SOURCE Motorola Sensor Device Data For More Information On This Product, Go to: www.freescale.com 7 MC14468 Freescale Semiconductor, Inc. Freescale Semiconductor, Inc... Mfax is a trademark of Motorola, Inc. Motorola reserves the right to make changes without further notice to any products herein. Motorola makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does Motorola assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation consequential or incidental damages. "Typical" parameters which may be provided in Motorola data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including "Typicals" must be validated for each customer application by customer's technical experts. Motorola does not convey any license under its patent rights nor the rights of others. Motorola products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the Motorola product could create a situation where personal injury or death may occur. Should Buyer purchase or use Motorola products for any such unintended or unauthorized application, Buyer shall indemnify and hold Motorola and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that Motorola was negligent regarding the design or manufacture of the part. Motorola and are registered trademarks of Motorola, Inc. Motorola, Inc. is an Equal Opportunity/Affirmative Action Employer. How to reach us: USA/EUROPE/Locations Not Listed: Motorola Literature Distribution; P.O. Box 5405, Denver, Colorado 80217. 1-303-675-2140 or 1-800-441-2447 JAPAN: Motorola Japan Ltd.; SPS, Technical Information Center, 3-20-1, Minami-Azabu. Minato-ku, Tokyo 106-8573 Japan. 81-3-3440-3569 ASIA/PACIFIC: Motorola Semiconductors H.K. Ltd.; Silicon Harbour Centre, 2 Dai King Street, Tai Po Industrial Estate, Tai Po, N.T., Hong Kong. 852-26668334 Customer Focus Center: 1-800-521-6274 MfaxTM: RMFAX0@email.sps.mot.com - TOUCHTONE 1-602-244-6609 Motorola Fax Back System - US & Canada ONLY 1-800-774-1848 - http://sps.motorola.com/mfax/ HOME PAGE: http://motorola.com/sps/ 8 For More Information On This Product, Go to: www.freescale.com Motorola Sensor Device Data MC14468/D |
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