All Errata Descriptions
[Crystal] 40 MHz Crystal Cannot Work
Description
ESP32-C2 was designed to support 26 MHz and 40 MHz crystals. However, for revision v1.0 and previous versions, some chips cannot work properly when equipped with 40 MHz crystal. Specific symptoms of the problem include clock issues, or printing garbled characters when powering on, etc.
Workarounds
Use 26 MHz crystal instead of 40 MHz for revision v1.0 and previous chips.
Solution
Fixed in chip revision v1.1, which supports both 26 MHz and 40 MHz crystals.