CP2102/9
CP2102
From VBUS
VBUS
From 5 V
Power Net
1.0 F
To 3V
Power Net
4.7 F
REGIN
0.1 F
VDD
0.1 F
VBUS Sense
5 V In
Voltage Regulator (REG0)
3 V Out
Device
Power Net
Figure 7. CP2102 Configuration 2: USB Self-Powered
From VBUS
24 k
Note 1
(Optional) 47 k
From 5 V
Power Net
1.0 F
To 3V
Power Net
4.7 F
CP2109
VBUS
REGIN
0.1 F
VDD
0.1 F
5 V In
VBUS Sense
Voltage Regulator (REG0)
3 V Out
Device
Power Net
Note 1 : For self-powered systems where VDD or REGIN may be unpowered when VBUS is
connected to 5 V, a resistor divider (or functionally-equivalent circuit) on VBUS is required
to meet the absolute maximum voltage on VBUS specification in the Electrical
Characteristics section.
Figure 8. CP2109 Configuration 2: USB Self-Powered
20
Rev. 1.8