あんまりびっくりしたんで、パワポで作図してみました。
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| FT231XSのピン配置(SSOP20タイプ) | 
This is a pin layout of FTDI FT231XS which is missing in official FTDI's datasheet.
You may use this freely because anyone can draw this by reading the datasheet.
DISCLAIMER:
LICENSE of this picture:  AS-IS.
I don't have any warranty to the correctness of this picture.  Use at your own risk.
