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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ST8034T датащи(PDF) 26 Page - STMicroelectronics |
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ST8034T датащи(HTML) 26 Page - STMicroelectronics |
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26 / 39 page  DocID024587 Rev 4 27/40 ST8034T, ST8034AT, ST8034P, ST8034C Functional description 6.6 Activation sequence The following device activation sequence is applied when using an external clock, see also Figure 12. 1. CMDVCC is pulled low (t0). 2. The internal oscillator is triggered (t0). 3. The internal oscillator changes to high frequency (t1). 4. VCC rises from 0 V to 3 V or to 5 V (or to 1.8 V in the case of ST8034P) on a controlled slope (t2). 5. I/O is driven high (t3). 6. The clock on the CLK output is applied to the C3 contact (t4). 7. RST is enabled (t5). Time delays t1 = t0 + 384 × 1/fOSC(INT)LOW t2 = t1 t3 (tD(START)) = t1 + 17T/2 t4 = driven by host microcontroller, t5 > t4 > t3 t5 (tD(END)) = t1 + 23T/2. T = 64 x 1/fOSC(INT) Figure 12. Activation sequence |
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