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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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33661 датащи(PDF) 13 Page - Freescale Semiconductor, Inc |
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33661 датащи(HTML) 13 Page - Freescale Semiconductor, Inc |
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13 / 21 page  Analog Integrated Circuit Device Data Freescale Semiconductor 13 33661 FUNCTIONAL DESCRIPTION FUNCTIONAL PIN DESCRIPTION WAKE INPUT PIN (WAKE) The WAKE pin is a high-voltage input used to wake up the device from the Sleep mode. WAKE is usually connected to an external switch in the application. The typical wake thresholds are VSUP/2. The WAKE pin has a special design structure and allows wake-up from both HIGH-to-LOW or LOW-to-HIGH transitions. When entering into Sleep mode, the LIN monitors the state of the WAKE pin and stores it as a reference state. The opposite state of this reference state will be the wake-up event used by the device to enter again into Normal mode. An internal filter is implemented (40 µs typical filtering time delay). WAKE pin input structure exhibits a high impedance, with extremely low input current when voltage at this pin is below 14 V. When voltage at the WAKE pin exceeds 14 V, input current starts to sink into the device. A serial resistor should be inserted in order to limit the input current mainly during transient pulses. Recommended resistor value is 33 k Ω. Important The WAKE pin should not be left open. If the wake-up function is not used, WAKE should be connected to ground to avoid false wake-up. |
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