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CP2103EK

SINGLE-CHIP USB TO UART BRIDGE

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CP2103

10. Voltage Regulator

The CP2103 includes an on-chip 5 to 3 V voltage regulator. This allows the CP2103 to be configured as either a

USB bus-powered device or a USB self-powered device. These configurations are shown in Figure 7 and Figure 8.

When enabled, the 3 V voltage regulator output appears on the VDD pin and can be used to power external 3 V

devices. See Table 10 for the voltage regulator electrical characteristics.

Alternatively, if 3 V power is supplied to the VDD pin, the CP2103 can function as a USB self-powered device with

the voltage regulator disabled. For this configuration, it is recommended that the REGIN input be tied to the 3 V net

to disable the voltage regulator. This configuration is shown in Figure 9.

The USB max power and power attributes descriptor must match the device power usage and configuration. See

Application Note “AN144: CP210x Customization Guide” for information on how to customize USB descriptors for

the CP2103.

Note: It is recommended that additional decoupling capacitance (e.g., 0.1 µF in parallel with 1.0 µF) be provided on the REGIN

input.

Table 10. Voltage Regulator Electrical Specifications

–40 to +85 °C unless otherwise specified.

Parameter

Conditions

Input Voltage Range

Output Voltage

Output Current = 1 to 100 mA*

VBUS Detection Input Threshold

Bias Current

*Note: The maximum regulator supply current is 100 mA.

Min Typ Max Units

4.0 — 5.25 V

3.0 3.3 3.6 V

1.0 1.8 4.0 V

— 110 — µA

From VBUS

To 3 V

Power Net

CP2103

VBUS

REGIN

VBUS Sense

5 V In

Voltage Regulator (REG0)

3 V Out

VDD

Figure 7. Configuration 1: USB Bus-Powered

Device

Power Net

Preliminary Rev. 0.3

15

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