CP2103 S I N G L E - C H I P USB T O UART B R I D G E Single-Chip USB to UART Data Transfer Virtual COM Port Device Drivers 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 Works with existing COM Port PC applications Royalty-free distribution license Windows®98 SE/2000/XP MAC OS-9 MAC OS-X Linux 2.40 USBXpress™ Direct Driver Support Example Applications USB Function Controller 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 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 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 Configurable I/O (VDD to 5 V) using external pull-up CP2103-GM RS-485 mode with bus transceiver control Temperature Range: –40 to +85 °C CP2103 External voltage supply or direct connection to VDD 5 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 2 3 SUSPEND 3.3 V VDD SUSPEND GND VBUS RI 48 MHz Oscillator DCD DTR 4 3 DD+ USB Transceiver USB Function Controller 4 5 6 1024B EEPROM UART 640B 576B TX RX Buffer Buffer DSR 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 Preliminary Rev. 0.2 9/05 Copyright © 2005 by Silicon Laboratories CP2103 This information applies to a product under development. Its characteristics and specifications are subject to change without notice. CP2103 2 Preliminary Rev. 0.2 CP2103 TA B L E O F C O N T E N TS 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. USBXpress™ Direct Driver Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 11. Voltage Regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Contact Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18 Preliminary Rev. 0.2 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 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. 4 Preliminary Rev. 0.2 CP2103 2. Absolute Maximum Ratings Table 1. Absolute Maximum Ratings Parameter 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. 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 Conditions Min Typ Max Units Supply Voltage (VDD) 3.0 3.3 3.6 V Supply Voltage (VIO) 1.8 3.3 VDD V Supply Current VDD = 3.3 V — 26 — mA Supply Current in Suspend VDD = 3.3 V — 330 — µA VIO Supply Current VBUS = 0 VDD = 0 VIO = 3.0 V — 500 — µA –40 — +85 °C Specified Operating Temperature Range Preliminary Rev. 0.2 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 Output High Voltage (VOH) IOH = –10 µA IOH = –3 mA IOH = –10 mA VIO – 0.1 VIO – 0.7 — — — VIO – 0.8 — — — V Output Low Voltage (VOL) 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 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 to 2.7 V, –40 to +85 °C unless otherwise specified. Parameters Conditions Min Typ Max UNITS Output High Voltage (VOH) IOH = TBD IOH = TBD IOH = TBD TBD TBD — — — TBD — — — V Output Low Voltage (VOL) IOL = TBD IOL = TBD — — — — TBD TBD V Input High Voltage (VIH) TBD — — V Input Low Voltage (VIL) — — TBD V Input Leakage Current TBD — TBD TBD µA Maximum Input Voltage Open drain, logic high (1) — — TBD V 6 Preliminary Rev. 0.2 CP2103 4. Pinout and Package Definitions Table 5. 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 Section 11. 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. Preliminary Rev. 0.2 7 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) 8 Preliminary Rev. 0.2 CP2103 14 13 12 11 15 6 16 D2 5 D2 2 17 e 4 2 20 21 22 23 24 25 26 27 DETAIL 1 28 1 18 19 E2 2 3 R 6xe E 10 9 Table 6. QFN-28 Package Dimensions L 7 E2 b 8 Bottom View 6xe D MAX 1.00 0.05 1.00 — 0.30 — 3.35 — 3.35 — 0.65 — — — — — — — — A1 e A3 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 A A2 Side View 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 — — — — DETAIL 1 CC DD BB AA Figure 3. QFN-28 Package Drawing Preliminary Rev. 0.2 9 CP2103 0.30 mm 0.50 mm 0.85 mm 0.35 mm 0.50 mm 0.10 mm 0.20 mm 0.20 mm 0.50 mm Top View b 0.20 mm L e E2 0.20 mm 0.30 mm 0.50 mm 0.85 mm 0.35 mm 0.10 mm E Figure 4. Typical QFN-28 Landing Diagram 10 Preliminary Rev. 0.2 D D2 Optional GND Connection CP2103 0.30 mm 0.35 mm 0.50 mm 0.60 mm 0.20 mm 0.10 mm 0.85 mm 0.50 mm 0.20 mm 0.20 mm 0.50 mm Top View 0.60 mm 0.30 mm 0.70 mm b 0.20 mm D D2 0.40 mm e L E2 0.20 mm 0.30 mm 0.50 mm 0.85 mm 0.35 mm 0.10 mm E Figure 5. Typical QFN-28 Solder Paste Diagram Preliminary Rev. 0.2 11 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 kΩ) can be used to ensure SUSPEND remains low during reset. See Figure 6 for other recommended options. I/O Voltage 5 V IO CP2103 1 µF VDD 7 R1 4.7 kΩ RST SUSPEND 6 C4 4.7 µF TANT C2 0.1 µF 2 VDD SUSPEND GND RI 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: 9 (to external circuitry for USB suspend states) 12 11 R2 10 kΩ 1 28 27 26 Option 4 External RS-232 transceiver or UART circuitry 25 24 23 22 19 18 17 External Application Circuitry 16 A 4.7 kΩ pull-up resistor can be added to increase noise immunity. A 4.7 µF 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 kΩ resistor to ground to hold SUSPEND low on initial power on or device reset. Figure 6. Typical Connection Diagram 12 Option 1 REGIN C1 1 µF 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 5, 6, 7, and 8 Stop Bits 1, 1.51, and 2 Parity Type None, Even, Odd, Mark, Space Baud Rates2 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® 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 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) 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. USBXpress™ Direct Driver Support The Silicon Laboratories USBXpress™ 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 µF in parallel with 1.0 µF) be provided on the REGIN input. 14 Preliminary Rev. 0.2 CP2103 Table 9. 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 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 16 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: [email protected] 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 18 Preliminary Rev. 0.2