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数据搜索系统，热门电子元器件搜索 |
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数据搜索系统，热门电子元器件搜索 |
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MPXM2202GS 数据表(PDF) 116 Page - Motorola, Inc |
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MPXM2202GS 数据表(HTML) 116 Page - Motorola, Inc |
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116 / 670 page  AN1612 2–80 Motorola Sensor Device Data www.motorola.com/semiconductors Figure 7. Silk Screen of the PCB GND SHOCK & MUTE PAGER R4 R2 C6 C12 R1 R3 U4 C11 R8 U5 R6 S1 C5 C10 R5 C3 C4 X1 D1 9V J2 C9 U1 U2 S2 C7 C8 C2 C1 R9 R7 J1 Figure 8. Solder Side of the PCB Table 1. Bill of Material for the Shock and Mute Pager Device Type Qty. Value References Ceramic Capacitor 4 0.1 µ C1, C2, C7, C9 Ceramic Capacitor 2 22p C3, C4 Ceramic Capacitor 3 10n C5, C6, C8 Solid Tantalum 1 0.33 µ C10 Electrolytic Capacitor 1 47 µ C11 Electrolytic Capacitor 1 1 µ C12 LED 1 5mm D1 Header 1 2 way J1 PCB Terminal Block 1 2 way J2 Resistor "5% 0.25W 1 100k R1 Single Turn Trimmer 1 100k R2 Resistor "5% 0.25W 4 10k R3, R5, R7, R9 Resistor "5% 0.25W 1 10M R4 Resistor "5% 0.25W 1 180R R6 Resistor "5% 0.25W 1 1k R8 Push Button 2 6mm S1, S2 MMA1201P 1 — U1 LM311N 1 — U2 MC68HC705B16CFN 1 — U3 Piezo Transducer 1 — U4 MC78L05ACP 1 — U5 Crystal 1 4MHz X1 Figure 9. Component Side of the PCB SOFTWARE DESCRIPTION Upon powering up the system, the piezo audio transducer is activated simulating an incoming page, if the pager is in sound mode (jumper J1 in ON). Then, the accelerometer is powered up and the output of the comparator is sampled to obtain the logic level. The “beeping” will continue until the accelerometer senses an impact greater than the threshold level. Only then the alert is muted. However when the pager is in silence mode (jumper J1 is OFF), which is indicated by the blinking red LED, the accelerometer is not activated. To stop the alert, press the push–button S2. To repeat the whole process, simply push the reset switch S1. Figure 10 is a flowchart for the program that controls the system. Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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