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MC145010 Folha de dados(PDF) 9 Page - Freescale Semiconductor, Inc |
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MC145010 Folha de dados(HTML) 9 Page - Freescale Semiconductor, Inc |
9 / 12 page Sensors Freescale Semiconductor 9 MC145010 Figure 8. Typical Battery-Powered Application CALIBRATION To facilitate checking the sensitivity and calibrating smoke detectors, the MC145010 can be placed in a calibration mode. In this mode, certain device pins are controlled/ reconfigured as shown in Table 5. To place the part in the calibration mode, pin 16 (Test) must be pulled below the VSS pin with 100 µA continuously drawn out of the pin for at least one cycle on the OSC pin. To exit this mode, the Test pin is floated for at least one OSC cycle. In the calibration mode, the IRED pulse happens at every clock cycle and strobe is always on (active low). Also, Low Battery and supervisory tests are disabled in this mode. 16 15 14 13 12 11 10 9 1 2 3 4 5 6 7 8 Test Low-supply Trip VSS R1 OSC LED Feedback Silver VDD IRED I/O Brass Strobe Detect C1 C2 Horn X1 To Other MC145010(s), Escape Light(S), Auxiliary Alarm(S), Remote Alarm(S), And/or Auto-dialer IR CURRENT R13* 4.7 TO 22 Q1 2.2 M R5! D4 Visible LED R7 47 k R6 100 k SW1 + + MC145010 Reverse Polarity Protection Circuit Pushbutton Test R2 10 M 0.01 µF C6! C3 1500 pF R1 100 k R3 470 R4! 100 k 9.0 V B1 D1 1 TO 22 µF C4** C1 0.047 µF C2* 4700 pF R14 560 Ω R11 250 k D2 IR Detector R8 8.2 k R9† 5.0 k R10 4.7 k D3 IR EMITTER R12 1.0 k C5 100 µF !Values for R4, R5, and C6 may differ depending on type of piezoelectric horn used. * C2 and R13 are used for coarse sensitivity adjustment. Typical values are shown. † R9 is for fine sensitivity adjustment (optional). If fixed resistors are used, R8 = 12 k, R10 is 5.6 k to 10 k, and R9 is eliminated. When R9 is used, noise pickup is increased due to antenna effects. Shielding may be required. **C4 should be 22 µF if B1 is a carbon battery. C4 could be reduced to 1 µF when an alkaline battery is used. |
Nº de peça semelhante - MC145010 |
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Descrição semelhante - MC145010 |
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