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| Freescale Semiconductor Technical Data MC145018 Rev 4, 05/2005 Low-Power CMOS Ionization Smoke Detector IC with Interconnect and Temporal Horn Driver The MC145018, 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. Features * * * * * * * * * * * * * Ionization Type with On-Chip FET Input Comparator Piezoelectric Horn Driver Guard Outputs on Both Sides of Detect Input Input-Protection 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 Supports NFPA 72, ANSi 53.41, and ISO 8201 Audible Emergency Evacuation Signals Power-On Reset Places IC in Standby Mode MC145018 IONIZATION SMOKE DETECTOR IC WITH INTERCONNECT AND TEMPORAL HORN DRIVER P SUFFIX PLASTIC DIP CASE 648-08 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 ORDERING INFORMATION Device MC145018P Case No. 648-08 Package Plastic Dip Figure 1. Pin Assignment (c) Freescale Semiconductor, Inc., 2005. All rights reserved. To Other Units VDD VDD I/O 2 Feedback 8 45 K Low Battery Comparator 11 Silver Brass Low V Set Detect Comp. Out Sensitivity Set 3 1 280 K 13 + - 10 Alarm Logic + - Detect Comparator 325 K 4 15 Guard Amp + - Detect Input Lo-Z 14 VDD Power-on Reset Strobe Out HI-Z 16 OSC And Timing 5 LED VDD = Pin 6 VSS = Pin 9 12 7 VDD Figure 2. Block Diagram Table 1. Maximum Ratings(1) (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 Value -0.5 to + 15 -0.25 to VDD + 0.25 10 30 -10 to + 60 -55 to + 125 5.0 Unit V V mA mA C C s 1. 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 it is recommended that Vin and Vout be constrained to the range VSS (Vin or Vout) VDD. MC145018 2 Sensors Freescale Semiconductor Table 2. Recommended Operating Conditions (Voltages referenced to VSS) Parameter Supply Voltage Timing Capacitor Timing Resistor Battery Load (Resistor or LED) Symbol VDD -- -- -- Value 9.0 0.1 8.2 10 Unit V F M mA Table 3. Electrical Characteristics (Voltages referenced to VSS, TA = 25C) Characteristic Operating Voltage Output Voltage Piezoelectric Horn Drivers (IOH = -16 mA) Comparators (IOH = -30 A) Piezoelectric Horn Drivers (IOL = + 16 mA) Comparators (IOL = +30 A) 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 -2 Output, VOH = VDD -2 Symbol VDD VOH VOL 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 -- -- -- -- -- Min 6.0 6.3 8.5 -- -- -- -- -- -- -- -- -- -- 7.2 47 75 -- -- VSS -10 -- 0.6 25 -4.0 Typ(1) -- -- 8.8 -- 0.1 -- -- -- 5.0 -- -- -- -- -- 50 100 -- -- -- 5.0 -- -- -- Max 12 -- -- 0.9 0.5 3.0 10 1000 9.0 12.0 1.0 0.1 6.0 7.8 53 150 100 50 VDD + 10 -- VDD -2 100 --16 V pF V A mA Unit V V V VOL Lo-Z Hi-Z IDD Iin Iin Iin Vlow Vset vhys VOS V k A pA A pA V %VDD mV mV Vin Cin Vcm IIH IOH 1. Data labelled "Typ'' is not to be used for design purposes but is intended as an indication of the IC's potential performance. MC145018 Sensors Freescale Semiconductor 3 Table 4. Timing Parameters (C = 0.1 F, Rbias = 8.2 M, VDD = 9.0 V, TA = 25C, See Figure 7) Characteristics Oscillator Period Oscillator Rise Time Horn Output (During Smoke) LED Output Horn Output (During Low Battery) 100.0 VDD = 9.0 VDC 10.0 ID , Drain Current (mA) VDD = 7.2 VDC TA = 25C Symbol No Smoke Smoke tCI tr On Time Off Time Between Pulses On Time On Time Between Pulses PWon PWoff tLED PWon ton toff 10.0 Min 1.46 37.5 10.1 450 450 35.0 10.1 10.1 35.0 Max 1.85 45.8 12.3 550 550 44.5 12.3 12.3 44.5 Units s ms ms ms ms s ms ms s TA = 25C 1.0 ID , Drain Current (mA) 1.0 VDD = 9.0 VDC or 7.2 VDC 0.1 P-CH Source and N-CH Sink Current 0.1 0 1 2 3 4 5 6 7 8 9 10 0.01 0 1 2 3 4 5 6 7 8 9 10 VDS, Drain To Source Voltage (VDC) VDS, Drain To Source Voltage (VDC) Figure 3. Typical LED Output I-V Characteristic 1000.0 Figure 4. Typical Comparator Output I-V Characteristic 1000.0 TA = 25C ID, Drain Current (mA) TA = 25C 100.0 ID, Drain Current (mA) 100.0 VDD = 9.0 Vdc VDD = 9.0 Vdc 10.0 VDD = 7.2 Vdc P-CH Source Current VDD = 7.2 Vdc 10.0 N-CH SInk Current 1.0 0 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 5. Typical P Horn Driver Output I-V Characteristic DEVICE OPERATION Timing The internal oscillator of the MC145018 operates with a period of 1.65 seconds during no-smoke conditions. Each 1.65 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 MC145018 4 Sensors Freescale Semiconductor 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 41.67 ms and the piezoelectric horn oscillator circuit is enabled. The horn output is modulated 500 ms on, 500 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 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 (see Figure 2) 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 11.6 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. 1M 1 To Other Units 2 3 4 330 5 6 7 8 MC145018 16 15 14 13 12 11 10 9 0.1 F 1M TEST 0.1 F + 8.2 M 9V 1.5 M* 0.001 F *NOTE: Component values may change depending on type of piezoelectric horn used. 220 k* Figure 6. Typical Application as Ionization Smoke Detector MC145018 Sensors Freescale Semiconductor 5 OSC Pin 12 Smoke - N -Y 1 2 3 4 5 6 7 8 9 23 24 1 6 12 18 24 OSC Pin 12 Smoke - N -Y No Smoke, Low Battery Low Bat - Y -N HYST Pin 13 No Smk No Low Bat Smoke Latch Alarm Condition No Smk ( 100 mV Level Shift) Low Bat - Y -N Horn - On - Off LED - Off - On Low Battery Chirp > > NFPA Mod 24 Clocks Figure 7. MC145017 Timing Diagram NOTE: 1. Horn modulation is self-completing. When going from smoke to no smoke, the alarm condition will terminate only when horn is off. Comparators are strobed once per cycle (1.65 sec for no smoke, 40 msec for smoke). For timing under remote conditions, refer to MC14468 data sheet. NFPA72: Temporal Horn Modulation Pattern 0.5 Sec 0.5 Sec 0.5 Sec 0.5 Sec 0.5 Sec 1.5 Sec 167msec Traditional 4/6 Horn Modulation Pattern 83 msec Figure 8. Horn Modulation MC145018 6 Sensors Freescale Semiconductor > > > > (Note 1) Horn - On - Off LED - Off - On 24 Clocks PACKAGE DIMENSIONS 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 MILLIMETERS MIN MAX MIN MAX 0.740 0.770 18.80 19.55 0.250 0.270 6.35 6.85 0.145 0.175 3.69 4.44 0.015 0.021 0.39 0.53 0.040 0.70 1.02 1.77 0.100 BSC 2.54 BSC 0.050 BSC 1.27 BSC 0.008 0.015 0.21 0.38 0.110 0.130 2.80 3.30 0.295 0.305 7.50 7.74 0 10 0 10 0.020 0.040 0.51 1.01 -A16 9 B 1 8 F S C L -TH G D 16 PL SEATING PLANE K J M 0.25 (0.010) M TA M STYLE 2: PIN 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 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 COMMON DRAIN COMMON DRAIN COMMON DRAIN COMMON DRAIN COMMON DRAIN COMMON DRAIN COMMON DRAIN COMMON DRAIN GATE SOURCE GATE SOURCE GATE SOURCE GATE SOURCE CASE 648-08 ISSUE R 16-LEAD PLASTIC DIP MC145018 Sensors Freescale Semiconductor 7 How to Reach Us: Home Page: www.freescale.com E-mail: support@freescale.com USA/Europe or Locations Not Listed: Freescale Semiconductor Technical Information Center, CH370 1300 N. Alma School Road Chandler, Arizona 85224 +1-800-521-6274 or +1-480-768-2130 support@freescale.com Europe, Middle East, and Africa: Freescale Halbleiter Deutschland GmbH Technical Information Center Schatzbogen 7 81829 Muenchen, Germany +44 1296 380 456 (English) +46 8 52200080 (English) +49 89 92103 559 (German) +33 1 69 35 48 48 (French) support@freescale.com Japan: Freescale Semiconductor Japan Ltd. Headquarters ARCO Tower 15F 1-8-1, Shimo-Meguro, Meguro-ku, Tokyo 153-0064 Japan 0120 191014 or +81 3 5437 9125 support.japan@freescale.com Asia/Pacific: Freescale Semiconductor Hong Kong Ltd. Technical Information Center 2 Dai King Street Tai Po Industrial Estate Tai Po, N.T., Hong Kong +800 2666 8080 support.asia@freescale.com For Literature Requests Only: Freescale Semiconductor Literature Distribution Center P.O. Box 5405 Denver, Colorado 80217 1-800-441-2447 or 303-675-2140 Fax: 303-675-2150 LDCForFreescaleSemiconductor@hibbertgroup.com Information in this document is provided solely to enable system and software implementers to use Freescale Semiconductor products. There are no express or implied copyright licenses granted hereunder to design or fabricate any integrated circuits or integrated circuits based on the information in this document. Freescale Semiconductor reserves the right to make changes without further notice to any products herein. Freescale Semiconductor makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does Freescale Semiconductor 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 that may be provided in Freescale Semiconductor 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. Freescale Semiconductor does not convey any license under its patent rights nor the rights of others. Freescale Semiconductor 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 Freescale Semiconductor product could create a situation where personal injury or death may occur. Should Buyer purchase or use Freescale Semiconductor products for any such unintended or unauthorized application, Buyer shall indemnify and hold Freescale Semiconductor 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 Freescale Semiconductor was negligent regarding the design or manufacture of the part. FreescaleTM and the Freescale logo are trademarks of Freescale Semiconductor, Inc. All other product or service names are the property of their respective owners. (c) Freescale Semiconductor, Inc. 2005. All rights reserved. MC145018 Rev. 4 05/2005 |
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