CH340 Datasheet (I)
10
sides
to reduce outside interference; the signal lines relevant to XI and XO
should be kept as short as
possible. In order to reduce the
high frequency interference, around the ground or
pour copper around the
relevant components.
7.2. USB to 3-line RS232 UART
(figure below)
The figure below shows that USB is converted to 3-line RS232 which is the most basic and most commonly
used. For U5, select MAX232/ICL232/SP232 etc.
Unused CH340 pins can be not connected. For CH340C/N/K/E/X/B, X4, C21 and C22 are not required.
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