Data Sheet

Shenzhen Waytronic Electronics Co., Ltd. WT2003S-16S Chip
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2.4.2. USB connection circuit
Remark: 1. VDDLDO is the only power input pin, input voltage 2.8V-5.5V.
2. VDDIO is the chip internal LDO output 3.3V, available to supply power for those with low
power consumption, such as SPI, SD card, single chip pull-up etc..
3. I/O port of chip is 3.3V. 5V single chip microcomputer communication. If there need to be
communication between 5V single chip and WT2003S-16S, 470R resistance can be used to reduce
voltage.
4. The ADK pin of chip has to connect to a 10k pull-up resistor, the power of chip needs to
connect to a capacitance for output/ input to the ground.