CP2103EK Silicon Laboratories Inc, CP2103EK Datasheet - Page 16

• Manufacturer Part Number: CP2103EK
• Description: KIT EVAL FOR CP2103 USB TO UART
• Manufacturer: Silicon Laboratories Inc

Specifications of CP2103EK

• Main Purpose: Interface, USB 2.0 to UART (RS232) Bridge
• Embedded: No
• Utilized Ic / Part: CP2103
• Primary Attributes: Full Speed, 300 bps to 1 Mbps
• Secondary Attributes: Software, Connector Provides Direct Access to UART Signals
• Processor To Be Evaluated: CP2103
• Interface Type: RS-232, USB
• Silicon Manufacturer: Silicon Labs
• Silicon Core Number: CP2103
• Kit Contents: Evaluation Board, RS-232 Cable, USB Cable And Driver CD
• Development Tool Type: Hardware / Software - Eval/Demo Board
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Contains lead / RoHS non-compliant
• Other names: 336-1163

CP2103
9. 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 Figures 7 and 8.
When enabled, the 3 V voltage regulator output appears on the V
devices. See Table 11 for the voltage regulator electrical characteristics.
Alternatively, if 3 V power is supplied to the V
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
“AN144: CP21xx Device 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
Table 11. Voltage Regulator Electrical Specifications
–40 to +85 °C unless otherwise specified.
16
Input Voltage Range
Output Voltage
VBUS Detection Input Threshold
Bias Current
*Note: The maximum regulator supply current is 100 mA.
From VBUS
Power Net
input.
To 3 V
Parameter
Figure 7. Configuration 1: USB Bus-Powered
REGIN
VBUS
V
DD
CP2103
DD
Output Current = 1 to 100 mA*
pin, the CP2103 can function as a USB self-powered device with
Rev. 1.0
Conditions
5 V In
DD
Voltage Regulator (REG0)
pin and can be used to power external 3 V
VBUS Sense
3 V Out
Min
4.0
3.0
1.0
—
Typ
110
3.3
1.8
—
5.25
Max
Power Net
3.6
4.0
—
Device
Units
µA
V
V
V