Device-Specific Power Delivery Network (PDN) Tool 2.0 User Guide

ID 683293
Date 8/24/2021
Public
Document Table of Contents

1.2.2.1.4. Dealing with Multiple Shared Power Supply Pin Types

You cannot add currents from multiple shared power supply pin types and enter them into a single supply pin type using the Intel® Power Distribution Network (PDN) tool.

The PDN tool calculates effective impedance based on the number of pins and package parasitic information for the chosen device. Entering the sum of shared currents into a single power supply pin type causes the PDN tool to miscalculate the spreading inductance. You should always enter the correct current for each power supply pin type into the PDN tool.

Example 1

If a shared 1.2 V power supply consists of VCCIO2A and VCCIO2B, each drawing 0.3 A for a total of 0.6 A, you should not enter 0.6 A for VCCIO2A and 0 A for VCCIO2B.

Instead, you should enter 0.3 A for VCCIO2A and 0.3 A for VCCIO2B.

Example 2

If a shared 1.03 V power supply consisting of VCCR_GXBL1C, VCCR_GXBL1D, VCCT_GXBL1C, and VCCT_GXBL1D drawing 0.5 A, 0.5 A, 0.2 A, and 0.2 A respectively, you should not enter 1 A for VCCR_GXBL1C and 0.4 A for VCCT_GXBL1C.

Instead, you should enter VCCR_GXBL1C = 0.5 A, VCCR_GXBL1D = 0.5 A, VCCT_GXBL1C = 0.2 A, and VCCT_GXBL1D = 0.2 A.