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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AN1012 датащи(PDF) 12 Page - STMicroelectronics |
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AN1012 датащи(HTML) 12 Page - STMicroelectronics |
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12 / 33 page  TIMEKEEPER products AN1012 12/33 Doc ID 6395 Rev 4 5 TIMEKEEPER products TIMEKEEPER® products are very similar in construction and operation to ZEROPOWER® products. However, they must be evaluated separately. The current drawn is highly dependent not only on the temperature, but also on whether the oscillator is active. The main components of TIMEKEEPER devices are (see Figure 5): ● a CMOS RAM array; ● voltage sense and switching circuitry; ● an analog oscillator and clock chain; ● a lithium power cell; and ● a high-accuracy quartz crystal. Figure 5. Block diagram of a TIMEKEEPER® device AI01383D LITHIUM CELL OSCILLATOR AND CLOCK CHAIN VPFD RST VCC VSS 32,768 Hz CRYSTAL VOLTAGE SENSE AND SWITCHING CIRCUITRY 16 x 8 BiPORT SRAM ARRAY 8176 x 8 SRAM ARRAY A0-A12 DQ0-DQ7 E W G POWER IRQ/FT |
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