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MC145018P Fiches technique(PDF) 4 Page - Freescale Semiconductor, Inc |
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MC145018P Fiches technique(HTML) 4 Page - Freescale Semiconductor, Inc |
4 / 8 page Sensors 4 Freescale Semiconductor MC145018 Figure 3. Typical LED Output I-V Characteristic Figure 4. Typical Comparator Output I-V Characteristic 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 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 Table 4. Timing Parameters (C = 0.1 µF, Rbias = 8.2 MΩ, VDD = 9.0 V, TA = 25°C, See Figure 7) Characteristics Symbol Min Max Units Oscillator Period No Smoke Smoke tCI 1.46 37.5 1.85 45.8 s ms Oscillator Rise Time tr 10.1 12.3 ms Horn Output On Time (During Smoke) 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 On Time (During Low Battery) Between Pulses ton toff 10.1 35.0 12.3 44.5 ms s VDS, Drain To Source Voltage (VDC) 0 1 234 5 6 7 8 9 10 0.1 1.0 10.0 100.0 VDD = 9.0 VDC VDD = 7.2 VDC TA = 25°C VDS, Drain To Source Voltage (VDC) 01 2 3 4 5 6 7 8 9 10 0.01 0.1 1.0 10.0 VDD = 9.0 VDC or 7.2 VDC TA = 25°C P-CH Source and N-CH Sink Current 0 1 234 5 6 7 8 9 10 1.0 10.0 100.0 1000.0 TA = 25°C VDS, Drain To Source Voltage (Vdc) N-CH SInk Current VDD = 7.2 Vdc VDD = 9.0 Vdc 0 1 2 3 4 5 678 9 10 1.0 10.0 100.0 1000.0 TA = 25°C VDS, Drain To Source Voltage (Vdc) P-CH Source Current VDD = 7.2 Vdc VDD = 9.0 Vdc |
Numéro de pièce similaire - MC145018P |
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Description similaire - MC145018P |
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