CP2102/9

Rev. 1.8

21

Figure 9. CP2102 Configuration 3: USB Self-Powered, Regulator Bypassed

Figure 10. CP2109 Configuration 3: USB Self-Powered, Regulator Bypassed

4.7

F

0.1

F

Voltage Regulator (REG0)

5 V In

3 V Out

VBUS Sense

REGIN

VBUS

From 3 V

Power Net

Device

Power Net

VDD

CP2102

From VBUS

1.0

F

0.1

F

4.7

F

0.1

F

Voltage Regulator (REG0)

5 V In

3 V Out

VBUS Sense

REGIN

VBUS

From 3 V

Power Net

Device

Power Net

VDD

CP2109

1.0

F

0.1

F

From VBUS

47 k

24 k

Note 1

(Optional)

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.