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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ST72589BW датащи(PDF) 19 Page - STMicroelectronics |
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ST72589BW датащи(HTML) 19 Page - STMicroelectronics |
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19 / 158 page  ST72589BW, ST72389BW 19/158 3.2 LOW CONSUMPTION OSCILLATOR The oscillator of the ST72589 and ST72389 devic- es is a Crystal/Ceramic Resonator Oscillator. Its architecture is based on a constant current to min- imize the consumption. It can be used either with an external resonator or an external source. This oscillator allows a high accuracy to supply the clock for the ST7 CPU and its internal peripherals. Using a Crystal/Ceramic Resonator The resonator and the load capacitances have to be connected as shown in Figure 10 and have to be mounted as close as possible to the oscillator pins in order to minimize output distortion and start-up stabilization time. Figure 10. Main Crystal/Ceramic Resonator Using an External Clock Source In this mode, a square clock signal with ~50% duty cycle has to drive the OSC1 pin while the OSC2 pin is tied to ground (see Figure 11). Figure 11. Main External Clock Source OSC1 OSC2 LOAD CAPACITANCES ST7 CL2 CL1 OSC1 OSC2 EXTERNAL ST7 SOURCE |
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