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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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CS8420-CSZ датащи(PDF) 54 Page - Cirrus Logic |
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CS8420-CSZ датащи(HTML) 54 Page - Cirrus Logic |
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54 / 94 page  54 DS245F4 CS8420 Miscellaneous Pins: U - User Data The U pin may optionally be used to input User data for transmission by the AES3 transmitter (see Figure 20 for timing information). Alternatively, the U pin may be set to output User data from the AES3 receiver (see Figure 19 for timing information). If not driven, a 47 k Ω pull-down resistor is recommended for the U pin since the default state of the UD direction bit sets the U pin as an input. The pull-down resistor ensures that the transmitted user data will be zero. If the U pin is always set to be an output, thereby causing the U bit manager to be the source of the U data, the resistor is not necessary. The U pin should not be tied directly to ground in case it is programmed to be an output and subsequently tries to output a logic high. This situation may affect the long-term reliability of the device. If the U pin is driven by a logic level output, a 100 Ω series resistor is recommended. |
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