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[ADV748x] About RX_5V_VBUS pin pull-down resistor

Hi,

There is the following description on page 143 of ADV748x_HardwareManual_RevPrB_2014-07-11.pdf.

"Important: When using the RX_5V / VBUS pin on the ADV748x, a large pull down resistor (100kΩ typical) to ground should be connected to this pin."

Why do we need a 100kΩ pull-down resistor?

Best regards.