MC145017 Rev. 6.0, 3/2007 Freescale Semiconductor Technical Data Low-Power CMOS Ionization Smoke Detector IC with Temporal Pattern Horn Driver The MC145017, 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. MC145017 LOW-POWER CMOS IONIZATION SMOKE DETECTOR IC WITH TEMPORAL PATTERN HORN DRIVER Features • • • • • • • • • • • Ionization Type with On-Chip FET Input Comparator 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 Outputs for Detect and Low Battery Internal Reverse Battery Protection Supports NFPA 72, ANSi 53.41, and ISO 8201 Audible Emergency Evacuation Signals Pb-Free Packaging Designated by Suffix Code ED and EG P SUFFIX ED SUFFIX (PB-FREE) PLASTIC DIP CASE 648-08 DETECT COMP. OUT 1 16 GUARD Hi-Z N/C 2 15 DETECT INPUT LOW V SET 3 14 GUARD LO-Z LOW V COMP. OUT 4 13 SENSITIVITY SET LED 5 12 OSC CAPACITOR ORDERING INFORMATION Device Case No. 648-08 Plastic Dip 751G-04 SOICW MC145017ED MCZ145017EG/R2 VDD 6 11 SILVER TIMING RESISTOR 7 10 BRASS FEEDBACK 8 9 Package MC145017P EG SUFFIX (PB-FREE) 16-LEAD SOICW CASE 751G-04 VSS DETECT COMP. OUT 1 16 N/C 2 15 LOW V SET 3 14 LOW V COMP. OUT LED 4 13 5 12 VDD 6 11 SENSITIVITY SET OSC CAPACITOR SILVER TIMING RESISTOR 7 10 BRASS FEEDBACK 8 9 GUARD HI-Z DETECT INPUT GUARD LO-Z VSS Figure 1. . Pin Connections Freescale Semiconductor, Inc. reserves the right to change the detail specifications, as may be required, to permit improvements in the design of its products. © Freescale Semiconductor, Inc., 2007. All rights reserved. VDD Piezoelectric Horn Driver VDD 4 80 K 3 - 10 7 VDD 1125 K 11 Latch + VDD Oscillator 1045 K 13 8 Low Battery Comp. 5 12 + Latch 1 15 + Detect Input 14 Lo-Z - 6 9 LED Driver VDD 16 HI-Z Active Guard Figure 2. Block Diagram Table 1. Maximum Ratings(1) (Voltages referenced to VSS) Rating Symbol Value Unit DC Supply Voltage VDD -0.5 to + 15 V Input Voltage, All Inputs Except Pin 8 VIN -0.25 to VDD +0.25 V DC Current Drain per Input Pin, Except Pin 15 = 1 mA I 10 mA DC Current Drain per Output Pin I 30 mA TA -10 to +60 °C Storage Temperature Range TSTG -55 to +125 °C Reverse Battery Time TRB 5.0 s Operating Temperature Range 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. Table 2. Recommended Operating Conditions (Voltages referenced to VSS) Parameter Symbol Value Unit VDD 9.0 V Timing Capacitor — 0.1 µF Timing Resistor — 8.2 MΩ Battery Load (Resistor or LED) — 10 mA Supply Voltage MC145017 2 Sensors Freescale Semiconductor Table 3. Electrical Characteristics(1) (Voltages referenced to VSS, TA = 25°C) Symbol VDD VDC Min Typ Max Unit Operating Voltage VDD — 6.0 — 12 V Output Voltage Piezoelectric Horn Drivers (IOH = -16 mA) Comparators (IOH = -30 µA) Piezoelectric Horn Drivers (IOL = +16 mA) Comparators (IOL = +30 µA) VOH 7.2 9.0 7.2 9.0 6.3 8.5 — — — 8.8 — 0.1 — — 0.9 0.5 Output Voltage — LED Driver, IOL = 10 mA VOL 7.2 — — 3.0 Characteristic VOL Output Impedance, Active Guard Pin 14 Pin 16 V V V kΩ LO-Z HI-Z 9.0 9.0 — — — — 10 1000 Operating Current (Rbias = 8.2 MΩ) IDD 9.0 12.0 — — 3.2 — 7.0 10.0 µA Input Current — Detect (40% R.H.) IIN 9.0 — — ±1.0 pA Input Current, Pin 8 IIN 9.0 — — ±0.1 µA Input Current @ 50°C, Pin 15 IIN — — — ±6.0 pA Internal Set Voltage Low Battery Sensitivity VLOW VSET 9.0 — 7.2 47 — 50 7.8 53 V %VDD Hysteresis VHYS 9.0 75 100 150 mV Offset Voltage (measured at VIN = VDD/2 Active Guard Detect Comparator VOS 9.0 9.0 — — — — ±100 ±50 Input Voltage Range, Pin 8 VIN — VSS -10 — VDD + 10 V Input Capacitance CIN — — 5.0 — pF Common Mode Voltage Range, Pin 15 VCM — 0.6 — VDD - 2 V mV 1. Data labelled “Typ” is not to be used for design purposes but is intended as an indication of the IC’s potential performance. Table 4. Timing Parameters (C = 0.1 µF, Rbias = 8.2 MΩ, VDD = 9.0 V, TA = 25°C, See Figure 7) Characteristics Oscillator Period No Smoke Smoke Oscillator Rise Time Symbol Min Max Units tCI 1.46 37.5 1.85 45.8 s ms tR 10.1 12.3 ms On Time Off Time PWON PWOFF 450 450 550 550 ms ms LED Output Between Pulses On Time tLED PWON 35.0 10.1 44.5 12.3 s ms Horn Output (During Low Battery) On Time Between Pulses tON tOFF 10.1 35.0 12.3 44.5 ms s Horn Output (During Smoke) MC145017 Sensors Freescale Semiconductor 3 10.0 100.0 TA = 25°C TA = 25°C 10.0 ID, Drain Current (mA) ID, Drain Current (mA) VDD = 9.0 Vdc VDD = 7.2 Vdc 1.0 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 VDS, Drain To Source Voltage (Vdc) 8 9 0.01 10 Figure 3. Typical LED Output I–V Characteristic 0 1 2 3 4 5 6 7 8 VDS, Drain To Source Voltage (Vdc) 1000.0 TA = 25°C VDD = 9.0 Vdc ID, Drain Current (mA) ID, Drain Current (mA) TA = 25°C 100.0 VDD = 7.2 Vdc 10.0 VDD = 9.0 Vdc VDD = 7.2 Vdc 10.0 P-CH Source Current 1.0 0 10 Figure 4. Typical Comparator Output I–V Characteristic 1000.0 100.0 9 1 2 3 4 5 6 7 VDS, Drain To Source Voltage (Vdc) N-CH Sink Current 8 9 10 1.0 0 1 2 3 4 5 6 7 VDS, Drain To Source Voltage (Vdc) 8 9 10 Figure 5. Typical P Horn Driver Output I–V Characteristic DEVICE OPERATION Timing The internal oscillator of the MC145017 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 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 smoke conditions the low battery alarm is inhibited, but the LED pulses at a 1.0 Hz rate. 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. 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 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 outputs, Pins 1 and 4, constantly show smoke/no smoke and good battery/low MC145017 4 Sensors Freescale Semiconductor battery, respectively. Pin 1 = VDD for smoke and Pin 4 = VDD for low battery. In this mode and during the 10 ms power strobe, chip current rises to approximately 50 µA. 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. 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 1M 1 8.2 MΩ 0.1 µF + 9V Test 16 MC145017 330 Ω 1M 2 15 3 14 4 13 5 12 6 11 7 10 8 9 0.1 µF 0.001 µF 1.5 MΩ* 220 kΩ* *NOTE: Component values may change depending on type of piezoelectric horn used. Figure 6. Typical Application as Ionization Smoke Detector OSC Pin 12 Smoke - N -Y 1 2 3 4 5 7 8 9 23 24 1 6 >> 24 OSC Pin 12 No Smk Latch Alarm Condition >> LOW BATTERY CHIRP 18 Smoke No Smk No Low Bat HYST Pin 13 12 Smoke - N -Y No Smoke, Low Battery Low Bat - Y -N HORN - On - Off 6 NFPA MOD ( LOW BAT - Y -N 100 mV Level Shift) >> (Note 1) HORN - ON - OFF LED - OFF - ON LED - Off - On 24 Clocks 24 Clocks 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 once per cycle (1.65 sec for no smoke, 40 msec for smoke). Figure 7. MC145017 Timing Diagram MC145017 Sensors Freescale Semiconductor 5 NFPA72: Temporal Horn Modulation Pattern 0.5 Sec 167 Msec 0.5 Sec 0.5 Sec 0.5 Sec 0.5 Sec 1.5 Sec 83 Msec Traditional 4/6 Horn Modulation Pattern Figure 8. Horn Modulation MC145017 6 Sensors Freescale Semiconductor PACKAGE DIMENSIONS CASE 648-08 ISSUE T 16-LEAD PLASTIC DIP MC145017 Sensors Freescale Semiconductor 7 PACKAGE DIMENSIONS CASE 751G-04 ISSUE F 16-LEAD SOICW MC145017 8 Sensors Freescale Semiconductor How to Reach Us: Home Page: www.freescale.com Web Support: http://www.freescale.com/support USA/Europe or Locations Not Listed: Freescale Semiconductor, Inc. Technical Information Center, EL516 2100 East Elliot Road Tempe, Arizona 85284 +1-800-521-6274 or +1-480-768-2130 www.freescale.com/support 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) www.freescale.com/support Japan: Freescale Semiconductor Japan Ltd. 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