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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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MAX17843 датащи(PDF) 92 Page - Maxim Integrated Products |
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MAX17843 датащи(HTML) 92 Page - Maxim Integrated Products |
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92 / 131 page  UART Interface The UART pins also employ both internal and external cir- cuits to protect against noise. The recommended external filters are shown in Figure 62. ESD protection is shown in Figure 64 and Figure 65. High-Z Idle Mode The high-Z idle mode lowers radiated emissions from wire harnesses by minimizing the charging and discharging of the AC-coupling capacitors when entering and exiting the idle mode. The application circuit shown in Figure 63 uses a weak resistor-divider to bias the TX lines to VDDL during the high-Z idle period and pnp transistor clamps to limit the maximum voltage at the TX pins during high noise injection. The resistor-divider and pnp clamps are not needed for applications utilizing only the low-Z mode. The low-Z and high-Z idle modes both exhibit a similar immu- nity to noise injection. Low-Z mode may be preferred for ports driving inductive loads to minimize ringing. Figure 62. UART Connection TXLN TXLP R44 47Ω R45 47Ω C50 2.2nF 600V C51 2.2nF 600V C52 15pF C53 15pF R52 100kΩ R53 100kΩ DAISY-CHAIN DEVICE (n) DAISY-CHAIN DEVICE (n-1) SIGNAL TRACES OR WIRE HARNESS TXUN TXUP R50 47Ω R51 47Ω RXLN RXLP C42 2.2nF 600V C43 2.2nF 600V C40 15pF C41 15pF R42 100kΩ R43 100kΩ SIGNAL TRACES OR WIRE HARNESS R54 1.5kΩ R55 1.5kΩ R40 1.5kΩ R41 1.5kΩ GNDL RXUP RXUN GNDL MAX17843 12-Channel, High-Voltage Smart Sensor Data-Acquisition Interface www.maximintegrated.com Maxim Integrated │ 92 |
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