C8051F340-GQR Datasheet, PDF (70/276 Pages) Silicon Laboratories – Full Speed USB Flash MCU Family

C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D
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
From 5 V
Power Net
To 3 V
Power Net
VBUS
REGIN
VDD
VBUS Sense
5 V In
Voltage Regulator (REG0)
3 V Out
Device
Power Net
Figure 8.2. REG0 Configuration: USB Self-Powered
70
Rev. 1.3