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C8051F38x USB MCU Slide 4
The Silicon Labs USB devices provide high functional density and integrate many of the components required for USB communications. For example, the internal oscillator is capable of generating the clock accuracy required for robust USB data links. The USB transceiver integrates the series termination resistors as well as the pull-up resistor required to start the enumeration process. Device power is generated from the integrated regulator that can be driven by the USB VBUS. The only recommended external components are the protection diodes for the D+/D- and VBUS lines. This integration reduces footprint, simplifies board design and reduces cost.
PTM Published on: 2011-06-01