一華半導體股份有限公司 MOSDESIGN SEMICONDUCTOR CORP. IONIZATION SMOKE DETECTOR WITH INTERCONNECT SMOKE DETECTOR M75018 GENERAL DESCRIPTION The M75018 is a low-current CMOS circuit providing all of the required features for an ionization-type smoke detector. A networking capability allows as many as 40 units to be interconnected so that if any unit senses smoke, all units will sound an alarm. In addition, special features are incorporated to facilitate alignment and test of the finished smoke detector. can be used in numerous other battery-operated safety/security applications. FEATURES ‧ Piezoelectric Horn driver. ‧ Guard outputs on both sides of 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. ‧ Comparators output for detect. ‧ Strobe output for external trim resistors. ‧ I/O Pin allows up to 40 units to be connected for common signaling. ‧ Power-on reset places IC in standby mode. PIN ASSIGNMENT M75018P DET_COMP 1 16 I/O GUARD 2 DECTOR IN LOW-V SET GUARD 1 STROBE OUT SEN_SET LED OSC_CAP. VDD HORN2 TIME_RES HORN1 FEED BACK 8 9 VSS 1/6 2007-07-27 一華半導體股份有限公司 SMOKE DETECTOR MOSDESIGN SEMICONDUCTOR CORP. IONIZATION SMOKE DETECTOR WITH INTERCONNECT M75018 PIN AND CIRCUIT DESCRIPTION Pin No 1 2 Pin Name DET_COMP I/O I/O Function O This pin provide a method of measuring the detect signal. To allow multiple smoke detectors to be command. If any single unit detect smoke (I/O is driven high), all connected units will sound their associated horns. The Led is suppressed I/O when an alarm is signaled from an interconnected unit. An internal NMOS device acts as a charge dump to aid in applications involving a large (distributed) capacitance on pin 2. The charge dump is activated only on the removal of a local alarm. 3 LOW-V SET The low battery threshold is set internally by a voltage divider connected between VDD and VSS. The threshold can be increased by connecting a resistor to VDD. The threshold can be I decreased by connecting a resistor to VSS. It will be a slight interaction here due the common voltage divider network. The battery voltage level is checked every 40 seconds during the 10mA, battery loading remains at 10 mA.10ms LED pulse. 4 STROBE OUT I The detector sensitivity can be decreased by connecting a resistor to pin 13. 5 LED The 9 Volt battery level is checked every 40 seconds during the LED pulse. The battery is O loaded via a 10mA pulse for 11.6 ms. 6 VDD ─ Power supply 7 TIME_RES. I A resistor between this pin and VDD is part of the oscillator and sets the capacitor charge and discharge current（default 8.2MΩ）. 8 FEEDBACK I This pin input to the feedback electrode. If the FEEDBACK pin is not used, it must be connected to VDD or VSS. 9 VSS ─ Ground 10 HORN1 11 HORN2 O These two pins are used in conjunction with external passive components and a selfresonating piezoelectric transducer. HORN1 is connected to the piezo metal support electrode; the complementary output, HORN2, is connected to the ceramic electrode. A O continuous modulated tone indicates either a local or remote alarm condition. A short (10ms) chirp indicates a low-battery chirp occurs almost simultaneous with the visible LED flash. 12 OSC_CAP. I 13 SEN_SET The detector sensitivity to smoke is set internally by a voltage divider connected between VDD and VSS. The sensitivity can be externally adjusted to the individual characteristics of I the ionization chamber by connecting a resistor between pin13 and VDD, or between pin 13 and VSS. It will be a slight interaction here due the common voltage divider network. 14 GUARD1 I 15 DECTOR IN I This pin is the ionization-type smoke detector input. 16 GUARD2 The voltage at these pins will be within 100mV of the input signal. This will keep surface I leakage currents to a minimum and provide a method of measuring the input voltage without loading the ionization chamber. A capacitor between this pin and VSS is part of the oscillator and sets charge and discharge time (default 0.1μF). This will keep surface leakage currents to a minimum and provide a method of measuring the input voltage without loading the ionization chamber. 2/6 2007-07-27 一華半導體股份有限公司 SMOKE DETECTOR MOSDESIGN SEMICONDUCTOR CORP. IONIZATION SMOKE DETECTOR WITH INTERCONNECT M75018 ABSOLUTE MAXIMUM RATING Sym. VDD VIN IIN TA TS Parameter Supply Voltage Range Input Voltage Range Input Current Operating Temperature Range Storage Temperature Range Rating -0.5 ~ 13 -0.3 to VDD + 0.3 10 -10 ~ 60 -35 ~ 125 Unit V V mA ℃ ℃ (Voltage referenced to Vss , TA=25℃) DC ELECTRICAL CHARACTERISTICS Characteristics Operating Voltage Sym. VDD VOH Output Voltage VOL Output Impedance, Active Guard VOL Lo-Z Hi-Z Operating Current IDD Input Current IIN VLOW VSET VHYS Internal Set Voltage Hysteresis Offset Voltage (measure at Vin=VDD/2) Input Voltage Range Input Capacitance Common Mode Voltage Range I/O Current Vos VIN CIN VCM IIH IOH VDD ─ 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 -10 Typ. ─ ─ 8.8 ─ 0.1 ─ ─ ─ 5.0 ─ ─ ─ ─ ─ 50 100 ─ ─ ─ 5.0 ─ ─ ─ Unit V V V V V V KΩ KΩ μA μA pA μA pA V %VDD mV mV mV V pF V μA mA Conditions Piezoelectric Horn Drivers (IOH = -16 mA) Comparators (IOH = -30μA) Piezoelectric Horn Drivers (IOL = +16 mA) Comparators (IOL = +30μA) Led Driver (IOL =10 mA) Pin 14 Pin 16 RBIAS =8.2 MΩ Detect ( 40% R.H. ) Pin 8 @50℃, Pin 15 Low Battery Sensitivity Active Guard Detect Comparator Pin 8 Pin 15 Input , VIH = VDD-2 ( Pin 2 ) Output , IOH = VDD-2 ( Pin 2 ) ( C=0.1μF, RBIAS = 8.2MΩ, VDD = 9.0V , TA=25℃) TIMING PARAMETERS Characteristics Oscillator Period 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 -25 Sym. No Smoke Smoke Oscillator Rise Time On Time Off Time Between LED Output Pulses On Time On Time Horn Output Pulses ( During Low Battery ) Off Time Horn Output ( During Smoke ) 3/6 tCI tr PWon PWoff tLED PWon ton toff 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 2007-07-27 Unit s ms ms ms ms s ms ms s 一華半導體股份有限公司 SMOKE DETECTOR MOSDESIGN SEMICONDUCTOR CORP. IONIZATION SMOKE DETECTOR WITH INTERCONNECT M75018 TIMING DIAGRAM STANDBY NO SMOKE / SMOKE NO LOW BATTERY LOW BATTERY NO SMOKE / LOW BATTERY SMOKE / NO LOW BATTERY 10ms 40ms 1.67s OSC (PIN 12) DETECT OUT (PIN 1) LOW BATTERY (INTERNAL) HYSTERESIS (INTERNAL) (PIN 13) (PIN 14) HORN LOW = DISABLE HIGH = ENABLE LOW BATTERY CHIRP (Note1) (PIN 10 & 11) BATTERY TEST SUPPRESSED CHIRP LED (PIN 5) (Note3) (Note3) 24 CLOCK CYCLES (40S) 24 CLOCK CYCLES (0.96s) 24 CLOCK CYCLES 6 CLOCK CYCLES (10.0s) STROBE OUT (PIN 4) I/O (PIN2) OUTPUT (LOCAL) I/O (PIN2) INPUT (REMOTE) LED (SUPPRESSED LED FOR REMOTE ONLY) 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 (1.67s for no smoke , 40 ms for smoke ). 3. Low battery comparator information is latched only during LED pulse. 4/6 2007-07-27 一華半導體股份有限公司 SMOKE DETECTOR MOSDESIGN SEMICONDUCTOR CORP. IONIZATION SMOKE DETECTOR WITH INTERCONNECT M75018 BLOCK DIAGRAM VDD I/O 6 2 FEEDBACK 8 40K LOW-V SET 3 DETECT COMP. OUT 1 LOW BATTERY COMPARATOR + 11 HORN 2 - 10 HORN 1 ALARM LOGIC 280K SENSITIVITY SET + 13 DETECT COMPARATOR - POWER-ON RESET 320K STROBE OUT 4 DETECT INPUT 15 GUARD AMP OSCILLATOR + - GUARD1 14 GUARD2 16 VDD 5 LED & TIMING 12 9 GND 5/6 OSC CAP. 7 TIME RES. 2007-07-27 一華半導體股份有限公司 SMOKE DETECTOR MOSDESIGN SEMICONDUCTOR CORP. IONIZATION SMOKE DETECTOR WITH INTERCONNECT M75018 APPLICATION DIAGRAM VDD = 9V 1MΩ 1MΩ M75018P DET_COMP 1 16 I/O GUARD 2 DECTOR IN TO OTHER UNITS LOW-V SET GUARD 1 STROBE OUT SEN_SET LED OSC_CAP. VDD HORN2 TIME_RES. HORN1 330Ω 8.2MΩ FEED BACK 0.1uF TEST 8 9 0.1uF VSS 1.5MΩ 0.001uF 220KΩ * All specs and applications shown above subject to change without prior notice. (以上電路及規格僅供參考,本公司得逕行修正) 6/6 2007-07-27