CP2103
S INGLE - C HIP USB TO UART B RIDGE
Single-Chip USB to UART Data Transfer
Integrated
Virtual COM Port Device Drivers
USB transceiver; no external resistors
Works
required
Integrated clock; no external crystal required
Integrated 1024-Byte EEPROM for vendor ID, product
ID, serial number, power descriptor, release number,
and product description strings
On-chip power-on reset circuit
On-chip voltage regulator: 3.3 V output
Windows
Mac
USB
USBXpress™ Direct Driver Support
Royalty-Free
Distribution License
7/Vista/XP/Server 2003/2000
Windows CE 6.0, 5.0, and 4.2
Example Applications
Upgrade
of RS-232 legacy devices to USB
of RS-485 legacy devices to USB
Cellular phone USB interface cable
PDA USB interface cable
USB to RS-232 serial adapter
Asynchronous Serial Data BUS (UART)
Upgrade
All
handshaking and modem interface signals
formats supported:
- Data bits: 5, 6, 7, and 8
- Stop bits: 1, 1.5, and 2
- Parity: odd, even, mark, space, no parity
Baud rates: 300 bps to 1 Mbps
576 Byte receive buffer; 640 byte transmit buffer
Hardware or X-On/X-Off handshaking supported
Four GPIO signals for status and control
Configurable I/O (1.8 V to VDD) using VIO pin
Data
RS-485
OS-X
Windows
Specification 2.0 compliant; full-speed (12 Mbps)
suspend states supported via SUSPEND pins
Configurable
®
7®/Vista®/XP®/Server 2003®/2000®
Linux
USB Function Controller
USB
with Existing COM Port PC Applications
Distribution License
Royalty-Free
Supply Voltage
Self-powered:
3.0 to 3.6 V
bus powered: 4.0 to 5.25 V
I/O voltage: 1.8 V to VDD
USB
Package
I/O (VDD to 5 V) using external pull-up
Lead
mode with bus transceiver control
free 28-pin QFN (5x5 mm)
Ordering Part Number
CP2103-GM
Temperature Range: –40 to +85 °C
CP2103
5
External
voltage supply
or direct
connection
to VDD
GPIO_0
VIO
GPIO_1
GPIO_2
4
7
REGIN
IN
GPIO_3
Voltage
Regulator
RST
OUT
6
2
8
USB
CONNECTOR
VBUS
DD+
GND
1
VDD
SUSPEND
GND
VBUS
RI
48 MHz
Oscillator
DCD
DTR
DSR
4
2
3
SUSPEND
3.3 V
3
DD+
USB
Transceiver
USB Function
Controller
4
5
6
1024B
EEPROM
UART
640B 576B
TX
RX
Buffer Buffer
TXD
RXD
RTS
CTS
19
18
17
(to external circuitry
for status and
control)
16
9
12
11
(to external circuitry
for USB suspend
states)
1
28
27
26
25
External RS-232
transceiver or
UART circuitry
24
23
22
Figure 1. Example System Diagram
Rev. 1.0 12/10
Copyright © 2010 by Silicon Laboratories
CP2103
CP2103
2
Rev. 1.0
CP2103
TABLE O F C ONTENTS
Section
Page
1. System Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
2. Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
3. Pinout and Package Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
4. USB Function Controller and Transceiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5. Asynchronous Serial Data Bus (UART) Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
6. GPIO Pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
7. Internal EEPROM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
8. CP2103 Device Drivers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
8.1. Virtual COM Port Drivers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
8.2. USBXpress Drivers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
8.3. Driver Customization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
8.4. Driver Certification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
9. Voltage Regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
10. Relevant Application Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Document Change List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
Contact Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
Rev. 1.0
3
CP2103
1. System Overview
The CP2103 is a highly-integrated USB-to-UART Bridge Controller providing a simple solution for updating
RS-232/RS-485 designs to USB using a minimum of components and PCB space. The CP2103 includes a USB
2.0 full-speed function controller, USB transceiver, oscillator, EEPROM, and asynchronous serial data bus (UART)
with full modem control signals in a compact 5x5 mm QFN-28 package (sometimes called “MLF” or “MLP”). No
other external USB components are required.
The on-chip EEPROM may be used to customize the USB Vendor ID, Product ID, Product Description String,
Power Descriptor, Device Release Number, and Device Serial Number as desired for OEM applications. The
EEPROM is programmed on-board via the USB, allowing the programming step to be easily integrated into the
product manufacturing and testing process.
Royalty-free Virtual COM Port (VCP) device drivers provided by Silicon Laboratories allow a CP2103-based
product to appear as a COM port to PC applications. The CP2103 UART interface implements all RS-232/RS-485
signals, including control and handshaking signals; so, existing system firmware does not need to be modified. The
device also features up to four GPIO signals that can be user-defined for status and control information. Support
for I/O interface voltages down to 1.8 V is provided via a VIO pin. In many existing RS-232 designs, all that is
required to update the design from RS-232 to USB is to replace the RS-232 level-translator with the CP2103.
Direct access driver support is available through the Silicon Laboratories USBXpress driver set. Go to
www.silabs.com for the latest application notes and product support information for CP2103.
An evaluation kit for the CP2103 (Part Number: CP2103EK) is available. It includes a CP2103-based USB-toUART/RS-232 evaluation board, a complete set of VCP device drivers, USB and RS-232 cables, and complete
documentation. Contact a Silicon Labs sales representatives or visit www.silabs.com to order the CP2103
Evaluation Kit.
4
Rev. 1.0
CP2103
2. Electrical Specifications
Table 1. Absolute Maximum Ratings
Parameters
Conditions
Min
Typ
Max
Units
Ambient Temperature under bias
–55
—
125
°C
Storage Temperature
–65
—
150
°C
Voltage on any I/O Pin or RST with respect to GND
–0.3
—
5.8
V
Voltage on VDD or VIO with respect to GND
–0.3
—
4.2
V
Maximum Total Current through VDD, VIO, and GND
—
—
500
mA
Maximum Output Current sunk by RST or any I/O pin
—
—
100
mA
Note: Stresses above those listed may cause permanent damage to the device. This is a stress rating only, and functional
operation of the devices at or exceeding the conditions in the operation listings of this specification is not implied.
Exposure to maximum rating conditions for extended periods may affect device reliability.
Table 2. Global DC Electrical Characteristics
VDD = 3.0 to 3.6 V, –40 to +85 °C unless otherwise specified
Parameters
Min
Typ
Max
Units
Supply Voltage (VDD)
3.0
3.3
3.6
V
Supply Voltage (VIO)
1.8
3.3
VDD
V
Normal Operation,
VREG Enabled
—
20
26
mA
Suspended,
VREG Enabled
—
80
100
µA
—
200
228
µA
—
500
—
µA
–40
—
+85
°C
Supply
Current1
Supply Current1
Conditions
Supply Current - USB Pull-up2
VIO Supply Current
VBUS = 0
VDD = 0
VIO = 3.0 V
Specified Operating Temperature Range
Notes:
1. If the device is connected to the USB bus, the USB Pull-up Current should be added to the supply current for total
supply current.
2. The USB pull-up supply current values are calculated based on USB specifications.
Rev. 1.0
5
CP2103
Table 3. UART and Suspend I/O DC Electrical Characteristics
VIO = VDD = 2.7 to 3.6 V, –40 to +85 °C unless otherwise specified
Parameters
Conditions
Min
Typ
Max
Units
IOH = –10 µA
IOH = –3 mA
IOH = –10 mA
VIO – 0.1
VIO – 0.7
—
—
—
VIO – 0.8
—
—
—
V
IOL = 8.5 mA
IOL = 10 µA
—
—
—
—
0.6
0.1
V
Input High Voltage (VIH)
2.0
—
—
V
Input Low Voltage (VIL)
—
—
0.8
V
Output High Voltage (VOH)
Output Low Voltage (VOL)
Input Leakage Current
Weak pull-ups enabled
Weak pull-ups disabled
—
—
25
—
50
±1
µA
Maximum Input Voltage
Open drain, logic high (1)
—
—
5.8
V
Table 4. UART and Suspend I/O DC Electrical Characteristics (Low-Voltage Operation)
VIO = 1.8 V, VDD = 2.7 to 3.6 V, –40 to +85 °C unless otherwise specified
Parameters
Conditions
Min
Typ
Max
Units
Output High Voltage (VOH)
IOH = –10 µA
IOH = –1 mA
VIO – 0.1
VIO – 0.4
—
—
—
—
V
Output Low Voltage (VOL)
IOL = 10 µA
IOL = 3 mA
—
—
—
—
0.1
0.4
V
Input High Voltage (VIH)
VIO x 0.7
—
—
V
Input Low Voltage (VIL)
—
—
VIO x 0.3
V
Input Leakage Current
Weak pull-ups enabled
Weak pull-ups disabled
—
—
—
6
±1
15
µA
Maximum Input Voltage
Open drain, logic high (1)
—
—
5.8
V
6
Rev. 1.0
CP2103
Table 5. Reset Electrical Characteristics
–40 to +85 °C unless otherwise specified
Parameters
Conditions
Min
Typ
Max
Units
RST Input High Voltage
0.7 x VIO
—
—
V
RST Input Low Voltage
—
—
0.3 x VIO
V
Minimum RST Low Time to
Generate a System Reset
15
—
—
µs
Table 6. Voltage Regulator Electrical Specifications
–40 to +85 °C unless otherwise specified
Parameters
Conditions
Min
Typ
Max
Units
4.0
—
5.25
V
3.0
3.3
3.6
V
VBUS Detection Input Threshold
1.0
1.8
4.0
V
Bias Current
—
110
—
µA
Input Voltage Range
Output Voltage
Output Current = 1 to 100 mA*
*Note: The maximum regulator supply current is 100 mA.
Rev. 1.0
7
CP2103
3. Pinout and Package Definitions
Table 7. CP2103 Pin Definitions
Name
Pin #
Type
VDD
6
Power In
Description
3.0–3.6 V Power Supply Voltage Input.
Power Out 3.3 V Voltage Regulator Output. See "9. Voltage Regulator" on page
16.
VIO
5
GND
2
Power In
1.8 V to VDD I/O Supply Voltage Input.
Ground. Must be tied to ground.
SGND
Ground. Must be tied to ground.
RST
9
D I/O
Device Reset. Open-drain output of internal POR or VDD monitor. An
external source can initiate a system reset by driving this pin low for
at least 15 µs.
REGIN
7
Power In
5 V Regulator Input. This pin is the input to the on-chip voltage regulator.
VBUS
8
D In
VBUS Sense Input. This pin should be connected to the VBUS signal
of a USB network. A 5 V signal on this pin indicates a USB network
connection.
D+
3
D I/O
USB D+
D–
4
D I/O
USB D–
TXD
25
D Out
Asynchronous data output (UART Transmit)
RXD
24
D In
Asynchronous data input (UART Receive)
CTS
22*
D In
Clear To Send control input (active low)
RTS
23*
D Out
Ready to Send control output (active low)
DSR
26*
D in
Data Set Ready control input (active low)
DTR
27*
D Out
DCD
28*
D In
Data Carrier Detect control input (active low)
RI
1*
D In
Ring Indicator control input (active low)
SUSPEND
12*
D Out
This pin is driven high when the CP2103 enters the USB suspend
state.
SUSPEND
11*
D Out
This pin is driven low when the CP2103 enters the USB suspend
state.
NC
10, 13–15,
20–21
GPIO.3
16
D I/O
User-configurable input or output.
GPIO.2
17
D I/O
User-configurable input or output.
GPIO.1
18
D I/O
User-configurable input or output.
GPIO.0
19
D I/O
User-configurable input or output.
Data Terminal Ready control output (active low)
These pins should be left unconnected or tied to VDD.
*Note: Pins can be left unconnected when not used.
8
Rev. 1.0
DCD
DTR
DSR
TXD
RXD
RTS
CTS
27
26
25
24
23
22
SGND
28
CP2103
RI
1
21
NC
GND
2
20
NC
D+
3
19
GPIO.0
D-
4
18
GPIO.1
VIO
5
17
GPIO.2
VDD
6
16
GPIO.3
REGIN
7
15
NC
CP2103
Top View
8
9
10
11
12
13
14
VBUS
RST
NC
SUSPEND
SUSPEND
NC
NC
SGND
Figure 2. QFN-28 Pinout Diagram (Top View)
Rev. 1.0
9
CP2103
Figure 3. QFN-28 Package Drawing
Table 8. QFN-28 Package Dimensions
Dimension
Min
Nom
Max
Dimension
Min
Nom
Max
A
A1
A3
0.80
0.03
0.90
0.07
0.25 REF
1.00
0.11
E2
L
aaa
2.90
0.45
3.15
0.55
0.15
3.35
0.65
b
D
0.18
0.25
5.00 BSC.
0.30
bbb
ddd
0.10
0.05
D2
e
2.90
3.15
0.50 BSC.
3.35
eee
Z
0.08
0.435
Y
0.18
E
5.00 BSC.
Notes:
1. All dimensions shown are in millimeters (mm) unless otherwise noted.
2. Dimensioning and tolerancing per ANSI Y14.5M-1994.
3. This drawing conforms to JEDEC outline MO-243, variation VHHD except for custom features D2, E2, L, Z, and Y
which are toleranced per supplier designation.
4. Recommended card reflow profile is per the JEDEC/IPC J-STD-020 specification for small body components.
10
Rev. 1.0
CP2103
Figure 4. Typical QFN-28 Land Pattern
Rev. 1.0
11
CP2103
Figure 5. Typical QFN-28 Solder Paste Diagram
12
Rev. 1.0
CP2103
4. USB Function Controller and Transceiver
The universal serial bus function controller in the CP2103 is a USB 2.0 compliant full-speed device with integrated
transceiver and on-chip matching and pull-up resistors. The USB function controller manages all data transfers
between the USB and the UART as well as command requests generated by the USB host controller and
commands for controlling the function of the UART.
The USB Suspend and Resume signals are supported for power management of both the CP2103 device as well
as external circuitry. The CP2103 will enter Suspend mode when Suspend signaling is detected on the bus. Upon
entering Suspend mode, the CP2103 asserts the SUSPEND and SUSPEND signals. SUSPEND and SUSPEND
are also asserted after a CP2103 reset until device configuration during USB Enumeration is complete.
The CP2103 exits the Suspend mode when any of the following events occurs: (1) Resume signaling is detected or
generated, (2) a USB Reset signal is detected, or (3) a device reset occurs. Upon exit from Suspend mode, the
SUSPEND and SUSPEND signals are de-asserted.
Both SUSPEND and SUSPEND temporarily float high during a CP2103 reset. If this behavior is undesirable, a
strong pulldown (10 k) can be used to ensure SUSPEND remains low during reset. See Figure 6 for other
recommended options.
I/O Voltage
5
CP2103
V IO
1 F
VDD
R1
4.7 k
7
RST
SUSPEND
6
C4
4.7 F
C2
0.1 F
2
Option 1
REGIN
C1
1 F
VDD
SUSPEND
GND
RI
9
(to external circuitry
for USB suspend
states)
12
11
R2
10 k
1
Option 4
Option 2
8
USB
CONNECTOR
VBUS
DD+
GND
DCD
VBUS
DTR
DSR
1
2
4
3
3
4
5
6
D1
D2
D-
TXD
D+
RXD
RTS
D3
Option 3
CTS
GPIO.0
GPIO.1
GPIO.2
GPIO.3
Option
Option
Option
Option
Option
1:
2:
3:
3:
4:
28
27
26
External RS-232
transceiver or
UART circuitry
25
24
23
22
19
18
17
External
Application
Circuitry
16
A 4.7 k pull-up resistor can be added to increase noise immunity.
A 4.7 µF capacitor can be added if powering other devices from the on-chip regulator.
Avalanche transient voltage suppression diodes should be added for ESD protection .
Use Littlefuse p/n SP0503BAHT or equivalent.
10 k resistor to ground to hold SUSPEND low on initial power on or device reset.
Figure 6. Typical Connection Diagram
Rev. 1.0
13
CP2103
5. Asynchronous Serial Data Bus (UART) Interface
The CP2103 UART interface consists of the TX (transmit) and RX (receive) data signals as well as the RTS, CTS,
DSR, DTR, DCD, and RI control signals. The UART supports RTS/CTS, DSR/DTR, and X-On/X-Off handshaking.
The UART can be programmed to support a variety of data formats and baud rates. If the Virtual COM Port drivers
are used, the data format and baud rate are set during COM port configuration on the PC. If the USBXpress drivers
are used, the CP2103 is configured through the USBXpress API. The available data formats and baud rates are
listed in Table 9.
Table 9. Data Formats and Baud Rates
Data Bits
5, 6, 7, and 8
Stop Bits
1, 1.51, and 2
Parity Type
2
Baud Rates
None, Even, Odd, Mark, Space
300, 600, 1200, 1800, 2400, 4000, 4800, 7200, 9600, 14400, 16000, 19200, 28800, 38400,
51200, 56000, 57600, 64000, 76800, 115200, 128000, 153600, 230400, 250000, 256000,
460800, 500000, 576000, 9216003
Notes:
1. 5-bit only.
2. Additional baud rates are supported. See “AN205: CP210x Baud Rate Support”.
3. 7 or 8 data bits only.
6. GPIO Pins
The CP2103 supports four user-configurable GPIO pins for status and control information. More information
regarding the configuration and use of these pins can be found in “AN144: CP21xx Device Customization Guide”
and “AN223: Port Configuration and GPIO for CP210x” available at www.silabs.com.
7. Internal EEPROM
The CP2103 includes an internal EEPROM that may be used to customize the USB Vendor ID (VID), Product ID
(PID), Product Description String, Power Descriptor, Device Release Number, and Device Serial Number as
desired for OEM applications. If the EEPROM is not programmed with OEM data, the default configuration data
shown in Table 10 is used.
While customization of the USB configuration data is optional, it is recommended to customize the VID/PID
combination. A unique VID/PID combination prevents the driver from conflicting with any other USB driver. A
vendor ID can be obtained from www.usb.org, or Silicon Labs can provide a free PID for the OEM product that can
be used with the Silicon Laboratories VID. It is also recommended to customize the serial number if the OEM
application is one in which it is possible for multiple CP2103-based devices to be connected to the same PC.
The internal EEPROM is programmed via the USB. This allows the OEM's USB configuration data and serial
number to be written to the CP2103 on-board during the manufacturing and testing process. A stand-alone utility
for programming the internal EEPROM is available from Silicon Labs. A library of routines provided in the form of a
Windows® DLL is also available. This library can be used to integrate the EEPROM programming step into custom
software used by the OEM to streamline testing and serial number management during manufacturing. The
EEPROM has a typical endurance of 100,000 write cycles with a data retention of 100 years. USB descriptors can
be locked to prevent future modification.
14
Rev. 1.0
CP2103
Table 10. Default USB Configuration Data
Name
Value
Vendor ID
10C4h
Product ID
EA60h
Power Descriptor (Attributes)
80h
Power Descriptor (Max. Power)
32h
Release Number
0100h
Serial Number
0001 (63 characters maximum)
Product Description String
“CP2103 USB to UART Bridge Controller” (126 characters maximum)
8. CP2103 Device Drivers
There are two sets of device drivers available for the CP2103 devices: the Virtual COM Port (VCP) drivers and the
USBXpress Direct Access drivers. Only one set of drivers is necessary to interface with the device. The latest
drivers are available at http://www.silabs.com/products/microcontroller/downloads.asp.
8.1. Virtual COM Port Drivers
The CP2103 Virtual COM Port (VCP) device drivers allow a CP2103-based device to appear to the PC's
application software as a COM port. Application software running on the PC accesses the CP2103-based device
as it would access a standard hardware COM port. However, actual data transfer between the PC and the CP2103
device is performed over the USB interface. Therefore, existing COM port applications may be used to transfer
data via the USB to the CP2103-based device without modifying the application. See “AN197: Serial
Communications Guide for the CP210x” for example code for interfacing to a CP2103 using the Virtual COM
drivers.
8.2. USBXpress Drivers
The Silicon Laboratories USBXpress drivers provide an alternate solution for interfacing with CP2103 devices. No
serial port protocol expertise is required. Instead, a simple, high-level application program interface (API) is used to
provide simpler CP201x connectivity and functionality. The USBXpress for CP210x Development Kit includes
Windows device drivers, Windows device driver installers and uninstallers, and a host interface function library
(host API) provided in the form of a Windows Dynamic Link Library (DLL). The USBXpress driver set is
recommended for new products that also include new PC software. The USBXpress interface is described in
“AN169: USBXpress® Programmer's Guide.”
8.3. Driver Customization
In addition to customizing the device as described in “7. Internal EEPROM” , the drivers and the drivers installation
package can be also be customized. See “AN220: USB Driver Customization” for more information on generating
customized VCP and USBXpress drivers.
8.4. Driver Certification
The default drivers that are shipped with the CP2103 are Microsoft WHQL (Windows Hardware Quality Labs)
certified. The certification means that the drivers have been tested by Microsoft, and their latest operating systems
(XP and Vista) allow the drivers to be installed without any warnings or errors.
The customized drivers generated using the AN220 software are not automatically certified. They must go first
through the Microsoft Driver Reseller Submission process. Contact Silicon Laboratories support for assistance with
this process.
Rev. 1.0
15
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 VDD pin and can be used to power external 3 V
devices. See Table 11 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
“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
input.
Table 11. Voltage Regulator Electrical Specifications
–40 to +85 °C unless otherwise specified.
Parameter
Conditions
Min
Typ
Max
Units
4.0
—
5.25
V
3.0
3.3
3.6
V
VBUS Detection Input Threshold
1.0
1.8
4.0
V
Bias Current
—
110
—
µA
Input Voltage Range
Output Voltage
Output Current = 1 to 100 mA*
*Note: The maximum regulator supply current is 100 mA.
CP2103
VBUS
VBUS Sense
From VBUS
REGIN
5 V In
Voltage Regulator (REG0)
3 V Out
To 3 V
Power Net
V DD
Device
Power Net
Figure 7. Configuration 1: USB Bus-Powered
16
Rev. 1.0
CP2103
CP2103
From VBUS
VBUS
VBUS Sense
From 5 V
Power Net
REGIN
5 V In
Voltage Regulator (REG0)
3 V Out
To 3V
Power Net
VDD
Device
Power Net
Figure 8. Configuration 2: USB Self-Powered
CP2103
From VBUS
VBUS
VBUS Sense
REGIN
5 V In
Voltage Regulator (REG0)
3 V Out
From 3 V
Power Net
VDD
Device
Power Net
Figure 9. Configuration 3: USB Self-Powered, Regulator Bypassed
Rev. 1.0
17
CP2103
10. Relevant Application Notes
The following application notes are applicable to the CP2103. The latest versions of these application notes and
their accompanying software are available at:
http://www.silabs.com/products/mcu/Pages/ApplicationNotes.aspx.
AN144: CP21xx Device Customization Guide
This application note describes how to use the AN144 software to configure the USB parameters on the
CP2103 devices.
AN169: USBXpress® Programmer's Guide
This application note describes the USBXpress API interface and includes example code.
AN197: Serial Communications Guide for the CP210x
This application note describes how to use the standard Windows COM port function to communicate with the
CP2103 and includes example code.
AN205: CP210x Baud Rate Support
This application note describes how to use the AN205 software to configure the baud rate aliasing feature on
the CP2103 devices.
AN220: USB Driver Customization
This application note describes how to use the AN220 software to customize the VCP or USBXpress drivers
with OEM information.
AN223: Port Configuration And GPIO for CP210x
This application note describes how to use the AN223 software to configure the GPIO’s other configurable pins.
18
Rev. 1.0
CP2103
DOCUMENT CHANGE LIST
Revision 0.1 to Revision 0.2
Updated “Linux 2.40” bullet on page 1.
Revision 0.2 to Revision 0.3
Added additional supported operating systems on
page 1.
Changed VDD conditions of Tables 2 and 3 from a
minimum of 2.7 to 3.0 V.
Updated typical and max Supply current numbers in
Table 2.
Updated package drawings in Figures 3, 4, and 5.
Removed tantalum requirement in Figure 6.
Consolidate Sections 9 and 10.
Added Section "10. Relevant Application Notes" on
page 18.
Revision 0.3 to Revision 0.4
Added voltage numbers to Table 4 on page 6.
Corrected notes numbering in Table 8 on page 10.
Revision 0.4 to Revision 1.0
Updated supported operating systems on page 1.
Updated notes in Table 2.
Updated AN144 title throughout document.
Rev. 1.0
19
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