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DS2407 датащи(PDF) 24 Page - Dallas Semiconductor |
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DS2407 датащи(HTML) 24 Page - Dallas Semiconductor |
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24 / 31 page ![]() DS2407 012099 24/31 INITIALIZATION PROCEDURE “RESET AND PRESENCE PULSES” Figure 14 tRSTH tRSTL tR VPULLUP VPULLUP MIN VIH MIN VIL MAX 0V tPDH tPDL RESISTOR MASTER DS2407 MASTER RX “PRESENCE PULSE” MASTER TX “RESET PULSE” 480 µs < tRSTL < 1 * 480 µs < tRSTH < 1 (includes recovery time) 15 µs < tPDH < 60 µs 60 µs < tPDL < 240 µs * In order not to mask interrupt signalling by other devices on the 1–Wire bus, tRSTL + tR should always be less than 960 µs. tRSTL should be limited to maximum 5 ms. Otherwise the DS2407 may perform a power–on reset cycle. READ/WRITE TIMING DIAGRAM Figure 15 Write–one Time Slot 60 µs tREC tLOW1 VPULLUP VPULLUP MIN VIH MIN VIL MAX 0V 15 µs DS2407 SAMPLING WINDOW tSLOT RESISTOR MASTER DS2407 60 µs < tSLOT < 120 µs 1 µs < tLOW1 < 15 µs 1 µs < tREC < 1 |
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