C8051F340/1/2/3/4/5/6/7

From VBUS

To 3 V Power Net

VBUS

REGIN

VDD

VBUS Sense

5 V In Voltage Regulator (REG0)

3 V Out

Device

Power Net

Figure 8.1. REG0 Configuration: USB Bus-Powered

From VBUS

VBUS

VBUS Sense

From 5 V

REGIN

Power Net

 

To 3 V

VDD

Power Net

 

5 V In Voltage Regulator (REG0)

3 V Out

Device

Power Net

Figure 8.2. REG0 Configuration: USB Self-Powered

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Silicon Laboratories C8051F345, C8051F347, C8051F346, C8051F341, C8051F343, C8051F340 REG0 Configuration USB Bus-Powered