Intel® Pentium® Silver and Intel® Celeron® Processors

Datasheet, Volume 1 of 2

ID 633935
Date 12/27/2022
Document Table of Contents

Configurable GPIO Voltage

Except for all pads in GPIO F, GPIO S, and GP_​DSW groups, all other GPIO pads support per-pad configurable voltage, which allows control selection of 1.8 V or 3.3 V for each pad. The configuration is done via soft straps.

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 3.3 V tolerant.
  • Output: the pin drives 3.3 V via a ~20 K pull-up. With this, any 1.8 V device must be capable of taking 20K 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:
  • GPIO F and S groups support 1.8 V only.
  • GP_​DSW group supports 3.3 V only.