Multi-Protocol Deceptive

The design concept
involves creating a small, low-cost power supply device. The final choice was to use the CH224K chip as a decoy, along with a phone charger, to power other devices. Looking at other open-source projects using the CH224K, the single-resistor method only offered four voltage levels, while level configuration provides five.
The design is
a single-chip design using level configuration to output 5V, 9V, 12V, 15V, and 20V.
Both Type-C ports can be used as input/output ports simultaneously, and one USB-A port is for output only.
The overall cost is extremely low; the CH224K is only 1 RMB on Taobao. Only three DIP switches are used; a four-position switch would be even cheaper.
Note! The level configuration direction is reversed from the manual!
The original manual's method was somewhat unreasonable; pulling all switches low resulted in a default output of 9V.
When the switch is open, the default output is 5V.
The level configuration method is printed on the PCB.
Testing showed 5V,
9V
, 12V
, 15V, and
20V
reverse input.