Cirrus-logic CS8420 Manual do Utilizador descarregar pdf (Página 54)

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 kΩ 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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Cirrus-logic CS8420 Manual do Utilizador Página 54