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Original question:

PGA308: part selection and design

PGA308: for noise parts

user6243139
Prodigy 180 points
Part Number: PGA308


I have one more question about the User's guide page 59 Fig. 5-2.  

Optional RPU is pull up resistor for noise. Can we use pull down resistor here? If yes, is the pull down resistor effect to noise?

Best regards,

KoT

  • 0
    TI__Guru 55466 points

    HI KoT,

    We recommend the pull-up resistor; and not a pull-down.  The digital 1-wire UART interface is a open drain interface, therefore a pull-up resistor is used and not a pull-down, where the interface is expected to idle high.  Communication occurs when the master or slave pulls the bus low.

    Thank you and Regards,

    Luis