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CP2103
SINGLE- CHI P USB T O UART B R I D G E
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
Virtual COM Port Device Drivers
Works with existing COM Port PC applications Royalty-free distribution license Windows(R)98 SE/2000/XP MAC OS-9 MAC OS-X Linux 2.40
USBXpressTM Direct Driver Support 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
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 VDD) using VIO pin Configurable I/O (VDD to 5 V) using external pull-up RS-485 mode with bus transceiver control
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 VDD
Package
Lead free 28-pin QFN (5 x 5 mm)
Ordering Part Number
CP2103-GM
Temperature Range: -40 to +85 C
CP2103
External voltage supply or direct connection to VDD
5 VIO
GPIO_0 GPIO_1 GPIO_2
19 18 17 16
(to external circuitry for status and control)
4
7 REGIN
IN
Voltage Regulator
OUT
GPIO_3
RST
9 12 11
6
VDD GND
3.3 V
SUSPEND SUSPEND
(to external circuitry for USB suspend states)
2
8
USB CONNECTOR VBUS DD+ GND
6 5 1 2 3 4 4 3
VBUS
48 MHz Oscillator
RI DCD DTR DSR TXD RXD RTS CTS
1 28 27 26 25 24 23 22
DD+
USB Transceiver
USB Function Controller 1024B EEPROM 640B 576B TX RX Buffer Buffer
UART
External RS-232 transceiver or UART circuitry
Figure 1. Example System Diagram
Preliminary Rev. 0.2 9/05
Copyright (c) 2005 by Silicon Laboratories
CP2103
This information applies to a product under development. Its characteristics and specifications are subject to change without notice.
CP2103
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Preliminary Rev. 0.2
CP2103 TABLE O F 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. Virtual Com Port Device Drivers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 10. USBXpressTM Direct Driver Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 11. Voltage Regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Contact Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
Preliminary Rev. 0.2
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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 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 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. 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-toUART/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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Preliminary Rev. 0.2
CP2103
2. Absolute Maximum Ratings
Table 1. Absolute Maximum Ratings
Parameter Ambient temperature under bias Storage Temperature Voltage on any I/O Pin or RST with respect to GND Voltage on VDD or VIO with respect to GND Maximum Total current through VDD, VIO, and GND Maximum output current sunk by RST or any I/O pin Conditions Min -55 -65 -0.3 -0.3 -- -- Typ -- -- -- -- -- -- Max 125 150 5.8 4.2 500 100 Units C C V V mA 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.
3. Global DC Electrical Characteristics
Table 2. Global DC Electrical Characteristics
VDD = 2.7 to 3.6 V, -40 to +85 C unless otherwise specified.
Parameter Supply Voltage (VDD) Supply Voltage (VIO) Supply Current Supply Current in Suspend VIO Supply Current
Conditions
Min 3.0 1.8
Typ 3.3 3.3 26 330 500
Max 3.6 VDD -- -- --
Units V V mA A A
VDD = 3.3 V VDD = 3.3 V VBUS = 0 VDD = 0 VIO = 3.0 V
-- -- --
Specified Operating Temperature Range
-40
--
+85
C
Preliminary Rev. 0.2
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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 Output High Voltage (VOH)
Conditions IOH = -10 A IOH = -3 mA IOH = -10 mA IOL = 8.5 mA IOL = 10 A
Min VIO - 0.1 VIO - 0.7 -- -- -- 2.0 --
Typ -- -- VIO - 0.8 -- -- -- -- 25 -- --
Max -- -- -- 0.6 0.1 -- 0.8 50 1 5.8
UNITS V
Output Low Voltage (VOL) Input High Voltage (VIH) Input Low Voltage (VIL) Input Leakage Current Maximum Input Voltage
V V V A V
weak pull-ups enabled weak pull-ups disabled Open drain, logic high (1)
-- -- --
Table 4. UART and Suspend I/O DC Electrical Characteristics (Low-Voltage Operation)
VIO = 1.8 V to 2.7 V, -40 to +85 C unless otherwise specified.
Parameters Output High Voltage (VOH)
Conditions IOH = TBD IOH = TBD IOH = TBD IOL = TBD IOL = TBD
Min TBD TBD -- -- -- TBD --
Typ -- -- TBD -- -- -- -- TBD --
Max -- -- -- TBD TBD -- TBD TBD TBD
UNITS V
Output Low Voltage (VOL) Input High Voltage (VIH) Input Low Voltage (VIL) Input Leakage Current Maximum Input Voltage
V V V A V
TBD Open drain, logic high (1)
-- --
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Preliminary Rev. 0.2
CP2103
4. Pinout and Package Definitions
Table 5. CP2103 Pin Definitions
Name VDD Pin # 6 Type Power In Description 3.0-3.6 V Power Supply Voltage Input.
Power Out 3.3 V Voltage Regulator Output. See Section 11. VIO GND SGND RST 9 D I/O 5 2 Power In 1.8 V to VDD I/O Supply Voltage Input. Ground. Must be tied to ground. Ground. Must be tied to ground. 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 s. 5 V Regulator Input. This pin is the input to the on-chip voltage regulator. 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. USB D+ USB D- Asynchronous data output (UART Transmit) Asynchronous data input (UART Receive) Clear To Send control input (active low) Ready to Send control output (active low) Data Set Ready control input (active low) Data Terminal Ready control output (active low) Data Carrier Detect control input (active low) Ring Indicator control input (active low) This pin is driven high when the CP2103 enters the USB suspend state. This pin is driven low when the CP2103 enters the USB suspend state. These pins should be left unconnected or tied to VDD. D I/O D I/O D I/O D I/O User-configurable input or output. User-configurable input or output. User-configurable input or output. User-configurable input or output.
REGIN VBUS
7 8
Power In D In
D+ D- TXD RXD CTS RTS DSR DTR DCD RI SUSPEND SUSPEND NC GPIO.3 GPIO.2 GPIO.1 GPIO.0
3 4 25 24 22* 23* 26* 27* 28* 1* 12* 11* 10, 13-15, 20-21 16 17 18 19
D I/O D I/O D Out D In D In D Out D in D Out D In D In D Out D Out
*Note: Pins can be left unconnected when not used.
Preliminary Rev. 0.2
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CP2103
DCD
DSR
RXD
DTR
TXD
RTS 23
28
27
26
25
24
SGND RI GND D+ DVIO VDD REGIN 1 2 3 4 5 6
22
CTS
21 20 19
NC NC GPIO.0 GPIO.1 GPIO.2 GPIO.3 NC
CP2103 Top View
18 17 16
SGND 7 15
10
11
12
13 NC
SUSPEND
SUSPEND
NC
VBUS
Figure 2. QFN-28 Pinout Diagram (Top View)
8
RST
Preliminary Rev. 0.2
NC
14
8
9
CP2103
Bottom View
Table 6. QFN-28 Package Dimensions
15 D2 D2 2 E2 R 16 17 18 19 20 DETAIL 1 28 27 26 25 24 23 22 21 6xe E
A A1 A2 A3 b D D2 E E2 e L N ND NE R AA BB CC DD MIN 0.80 0 0 -- 0.18 -- 2.90 -- 2.90 -- 0.45 -- -- -- 0.09 -- -- -- -- MM TYP 0.90 0.02 0.65 0.25 0.23 5.00 3.15 5.00 3.15 0.5 0.55 28 7 7 -- 0.435 0.435 0.18 0.18 MAX 1.00 0.05 1.00 -- 0.30 -- 3.35 -- 3.35 -- 0.65 -- -- -- -- -- -- -- --
10
11
12
13
L 7
6 5 4 e b
2 1
6xe D
Side View
A2 A DD BB
Preliminary Rev. 0.2
A3
DETAIL 1 AA
CC
Figure 3. QFN-28 Package Drawing
A1
e
E2 2
3
14
8
9
9
CP2103
Top View
0.50 mm 0.20 mm 0.20 mm 0.30 mm 0.85 mm
0.50 mm D2 0.35 mm
0.50 mm
0.20 mm
Optional GND Connection
b
0.10 mm
L E2
0.20 mm
0.30 mm
e
0.50 mm 0.10 mm
0.35 mm
0.85 mm
E
Figure 4. Typical QFN-28 Landing Diagram
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Preliminary Rev. 0.2
D
CP2103
Top View
0.20 mm 0.20 mm 0.50 mm 0.30 mm 0.85 mm
0.50 mm 0.60 mm 0.60 mm 0.70 mm 0.30 mm 0.20 mm 0.40 mm D2 0.35 mm
0.50 mm
0.20 mm
b
0.10 mm
L
e
E2
0.20 mm
0.30 mm
0.50 mm 0.10 mm
0.35 mm
0.85 mm
E
Figure 5. Typical QFN-28 Solder Paste Diagram
Preliminary Rev. 0.2
D
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CP2103
5. 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. On 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 occur: (1) Resume signaling is detected or generated, (2) a USB Reset signal is detected, or (3) a device reset occurs. On exit of 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 1 F V IO
CP2103
VDD R1 4.7 k Option 1
7 C1 1 F
REGIN RST SUSPEND 9 12 11 R2 10 k 1 28 27 26 25 24 23 22 19 18 17 16 Option 4
6 C4 4.7 F TANT Option 2 C2 0.1 F 2
(to external circuitry for USB suspend states)
VDD GND
SUSPEND
RI DCD DTR DSR
USB CONNECTOR VBUS DD+ GND
6 5 1
2
8
VBUS
External RS-232 transceiver or UART circuitry
4 3
DD+
TXD RXD RTS
3 4 D1 D2 D3
Option 3
CTS GPIO.0 GPIO.1 GPIO.2 GPIO.3
External Application Circuitry
Option Option Option Option Option
1: 2: 3: 3: 4:
A 4.7 k pull-up resistor can be added to increase noise immunity. A 4.7 F tantalum 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
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Preliminary Rev. 0.2
CP2103
6. 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 is programmable to support a variety of data formats and baud rates. The data format and baud rate programmed into the UART is set during COM port configuration on the PC. The data formats and baud rates available are listed in Table 7.
Table 7. Data Formats and Baud Rates
Data Bits Stop Bits Parity Type Baud Rates2 5, 6, 7, and 8 1, 1.51, and 2 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.
7. GPIO Pins
The CP2103 supports (4) user-configurable GPIO pins for status and control information. More information regarding the configuration and usage of these pins can be found in "AN144: CP210x Customization Guide" and "AN223: Port Configuration and GPIO for CP210x" available on the Silicon Laboratories website.
8. Internal EEPROM
The CP2103 includes an internal EEPROM that 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. Customization of the USB configuration data is optional. If the EEPROM is not programmed with OEM data, the default configuration data shown in Table 8 is used. However, a unique serial number is required for OEM applications 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 Laboratories. A library of routines provided in the form of a Windows(R) 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.
Preliminary Rev. 0.2
13
CP2103
Table 8. Default USB Configuration Data
Name Vendor ID Product ID Power Descriptor (Max. Power) Release Number Serial Number Product Description String 10C4h EA60h 32h 0100h 0001 (63 characters maximum) "CP2103 USB to UART Bridge Controller" (126 characters maximum) Value
Power Descriptor (Attributes) 80h
9. Virtual Com Port Device Drivers
The CP210x Virtual COM Port (VCP) device drivers allow a CP2103-based device to appear to the PC's application software as an additional COM port (in addition to any existing hardware COM ports). 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. Therefore, existing COM port applications may be used to transfer data via the USB to the CP2103-based device without modifying the application. Contact Silicon Laboratories for the latest list of supported operating systems.
Note: Silicon Laboratories' VCP device drivers are required for device operation and are only distributed as part of the CP2103 Evaluation Kit (Part Number: CP2103EK). Contact any of Silicon Lab's sales representatives or go to www.silabs.com to order the CP2103 Evaluation Kit. The CP210x drivers and programming utilities are subject to change without notice. Subscription to the website "Auto Email Alert" system for automatic notification of updates and the use of the "Product Update Registration" service is recommended.
10. USBXpressTM Direct Driver Support
The Silicon Laboratories USBXpressTM for CP210x Development Kit provides an alternate solution for interfacing with CP2103 devices than using the Virtual COM port. No Serial Port protocol expertise is required. Instead, a simple, high-level application program interface (API) is used to provide simpler CP2103 connectivity and functionality. The USBXpress for CP210x Development Kit includes Windows device drivers, Windows device driver installer and uninstallers, and a host interface function library (host API) provided in the form of a Windows Dynamic Link Library (DLL). The included device drivers and installation files support MS Windows 98SE/2000/XP.
11. 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 9 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 F in parallel with 1.0 F) be provided on the REGIN input.
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Preliminary Rev. 0.2
CP2103
Table 9. Voltage Regulator Electrical Specifications
-40 to +85 C unless otherwise specified.
Parameter Input Voltage Range Output Voltage VBUS Detection Input Threshold Bias Current
*Note: The maximum regulator supply current is 100 mA.
Conditions
Min 4.0
Typ -- 3.3 1.8 110
Max 5.25 3.6 4.0 --
Units V V V A
Output Current = 1 to 100 mA*
3.0 1.0 --
CP2103
VBUS
From VBUS REGIN 5 V In
VBUS Sense
Voltage Regulator (REG0)
3 V Out To 3 V Power Net VDD Device Power Net
Figure 7. Configuration 1: USB Bus-Powered
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
Preliminary Rev. 0.2
15
CP2103
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
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Preliminary Rev. 0.2
CP2103
Document Change List
Revision 0.1 to Revision 0.2
Updated "Linux 2.40" bullet on page 1.
Preliminary Rev. 0.2
17
CP2103
CONTACT INFORMATION
Silicon Laboratories Inc. 4635 Boston Lane Austin, TX 78735 Tel: 1+(512) 416-8500 Fax: 1+(512) 416-9669 Toll Free: 1+(877) 444-3032 Email: MCUinfo@silabs.com Internet: www.silabs.com
The information in this document is believed to be accurate in all respects at the time of publication but is subject to change without notice. Silicon Laboratories assumes no responsibility for errors and omissions, and disclaims responsibility for any consequences resulting from the use of information included herein. Additionally, Silicon Laboratories assumes no responsibility for the functioning of undescribed features or parameters. Silicon Laboratories reserves the right to make changes without further notice. Silicon Laboratories makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does Silicon Laboratories assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation consequential or incidental damages. Silicon Laboratories products are not designed, intended, or authorized for use in applications intended to support or sustain life, or for any other application in which the failure of the Silicon Laboratories product could create a situation where personal injury or death may occur. Should Buyer purchase or use Silicon Laboratories products for any such unintended or unauthorized application, Buyer shall indemnify and hold Silicon Laboratories harmless against all claims and damages.
Silicon Laboratories, Silicon Labs, and USBXpress are trademarks of Silicon Laboratories Inc. Other products or brandnames mentioned herein are trademarks or registered trademarks of their respective holders
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Preliminary Rev. 0.2

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