Intel® 500 Series Chipset Family On-Package PCH Datasheet Volume 1

Datasheet

ID Date Version Classification
631119 21/09/2021 00:00:00 Public Content

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Document Table of Contents

Configurable GPIO Voltage

Except for all pads in GPIO S, GPIO R, and GPD groups, all other GPIO groups support per-pad configurable voltage, which allows control selection of 1.8 V or 3.3 V for each pad.

Before soft straps are loaded, the default voltage of each pin depends on its default as input or output.

  • Input: 1.8 V level with 3.3V tolerant.
  • Output: The pin drives 3.3 V via a ~20 kohm pull-up. With this, any 1.8 V device must be capable of taking 20 kohm pull-up to 3.3 V.
Warning:GPIO pad voltage configuration must be set correctly depending on device connected to it; otherwise, damage to the PCH or the device may occur. Notes:
  1. GPIO S group supports 1.8 V only.
  2. GPIO R group supports per-group voltage configuration (3.3 V or 1.8 V) only.
  3. GPD group supports 3.3 V only.