Data Sheet

Ethernet Controller I210 —Design Considerations
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12.7 I210 Power Supplies
The I210 requires three power rails: 3.3 Vdc, 1.5 Vdc, and 0.9 Vdc. Intel recommends that board
designers use the integrated switching voltage regulators derived from a single 3.3 Vdc supply to
reduce Bill of Material (BOM) costs. A central power supply can provide the required voltage sources
designed by a system power engineer. If the LAN wake capability is used, all voltages must remain
present during system power down. External voltage regulators need to generate the proper voltage,
supply current requirements (with adequate margin), and provide the proper power sequencing.
Refer to Section 12.7.2 for detailed information about power supply sequencing rules.
12.7.1 Power Delivery Solutions
Table 12-22 shows the intended design options for power delivery solutions. See Section 11.3 for more
details.
Note: Follow the power sequencing instructions described in Section 12.7.2.
Table 12-22. I210 Power Supply Pinouts ( SerDes )
Symbol Lead #
Type /
Voltage
Name and Function
VDD3p3 51 3.3V
Pin 51: In BASE-T, 3.3V analog power supply to GPHY; in
SerDes, 1.5V analog power supply to SGMII SerDes.
VDD1p5 56 1.5V
Pin 56: In BASE-T, 1.5V analog power supply to GPHY; in
SerDes, not connected.