The NuMicro® Cortex-M0 family supports powerful full-speed USB devices embedded 1.5kΩ pull-up resistor and LDO 3.3V output.
Please refer to the picture below and note that the impedance of D- and D+ traces should match 45Ω.
Also, 1.5kΩ pull-up resistor and LDO 3.3V output can be controlled by DPPU bit and PWRDN bit of USB_ATTR respectively.
Note: VDD33 is only used by the internal circuit of NuMicro® Cortex-M0 Series and must be connected with 1uF capacitance for voltage stability.
How to design hardware circuit for USB interface?
林昌宏/ Henry
新唐科技 / nuvoTon technology corporation
新竹科學工業園區30077研新三路4號
TEL : (03) 5770066#38077
Email : CHLIN55@nuvoTon.com
新唐科技 / nuvoTon technology corporation
新竹科學工業園區30077研新三路4號
TEL : (03) 5770066#38077
Email : CHLIN55@nuvoTon.com
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