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Preliminary Rev. 0.3 5/07 Copyright © 2007 by Silicon Laboratories CP2103
CP2103
SINGLE-CHIP USB TO UART BRIDGE
Single-Chip USB to UART Data Transfer
-
Integrated USB transceiver; no external resistors
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
USB Function Controller
-
USB Specification 2.0 compliant; full-speed (12 Mbps)
- USB suspend states supported via SUSPEND pins
Asynchronous Serial Data BUS (UART)
-
All handshaking and modem interface signals
- Data 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 Mbits
- 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 V
DD
) using V
IO
pin
- Configurable I/O (V
DD
to 5 V) using external pull-up
- RS-485 mode with bus transceiver control
Virtual COM Port Device Drivers
-
Works with Existing COM Port PC Applications
- Royalty-Free Distribution License
- Windows Vista/XP/Server 2003/2000/98SE
- Mac OS-X / OS-9
- Linux
USBXpress™ Direct Driver Support
-
Royalty-Free Distribution License
- Windows Vista/XP/Server 2003/2000
- Windows CE 6.0, 5.0, and 4.2
Example Applications
-
Upgrade of RS-232 legacy devices to USB
- Upgrade of RS-485 legacy devices to USB
- Cellular phone USB interface cable
- PDA USB interface cable
- USB to RS-232 serial adapter
Supply Voltage
-
Self-powered: 3.0 to 3.6 V
- USB bus powered: 4.0 to 5.25 V
- I/O voltage: 1.8 V to V
DD
Package
-
Lead free 28-pin QFN (5 x 5 mm)
Ordering Part Number
-
CP2103-GM
Temperature Range: –40 to +85 °C
Figure 1. Example System Diagram
CP2103
3
.
3
V
Voltage
Regulator
48 MHz
Oscillator
IN
OUT
SUSPEND
SUSPEND
11
12
REGIN
7
GND
2
RST
9
D+
D-
4
8
UART
RI
DCD
CTS
RTS
RXD
TXD
DSR
DTR
1
28
27
26
25
24
23
22
2
3 3
External RS-232
transceiver or
UART circuitry
(to external circuitry
for USB suspend
states)
VBUS
D-
D+
GND
4
5
6
USB
CONNECTOR
6
1
VDD
VBUS
USB Function
Controller
USB
Transceiver
640B
TX
Buffer
576B
RX
Buffer
1024B
EEPROM
GPIO_0
GPIO_1
GPIO_3
GPIO_2
1
8
1
7
1
6
(to external circuitry
for status and
control)
4
VIO
5
External
voltage supply
or direct
connection
to VDD
1
9
CP2103
2 Preliminary Rev. 0.3
NOTES:
CP2103
Preliminary Rev. 0.3 3
TABLE OF CONTENTS
Section Page
1. System Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
2. Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
3. Global DC Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
4. Pinout and Package Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
5. USB Function Controller and Transceiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
6. Asynchronous Serial Data Bus (UART) Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
7. GPIO Pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
8. Internal EEPROM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
9. CP2103 Device Drivers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
9.1. Virtual COM Port Drivers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
9.2. USBXpress Drivers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
9.3. Driver Customization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
9.4. Driver Certification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
10. Voltage Regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
11. Relevant Application Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
Document Change List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
Contact Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
CP2103
4 Preliminary Rev. 0.3
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 5 x 5 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 (4) 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 V
IO
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. See 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-to-
UART/RS-232 evaluation board, a complete set of VCP device drivers, USB and RS-232 cables, and full
documentation. Contact a Silicon Labs’ sales representatives or go to www.silabs.com to order the CP2103
Evaluation Kit.
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