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DP83869HM: Two-supply mode and Three-supply mode

Part Number: DP83869HM


Tool/software:

Hi,

Could you please explain the difference between the two-supply mode and three-supply mode?

From the datasheet, it is mentioned that in the two-supply configuration, no power rail is connected to the VDDA1P8_x pins (pin 13 and pin 48). In the three-supply mode, all three power rails must be connected.

  • Why is the three-supply mode necessary, and what is the significance of both modes?
  • Is there any particular reason why one would choose to use the two-supply mode over the three-supply mode, or vice versa?