CP2101R

CP2101 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 512-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 * (Contact factory for availability) 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: 8 • Stop Bits: 1 • Parity: Odd, Even, No Parity - Baud Rates: 300 bps to 921.6 kbps - 512 Byte Receive Buffer; 512 Byte Transmit Buffer - Hardware or X-On / X-Off Handshaking Supported - Event Character Support 7 REGIN Virtual COM Port Device Drivers - Works with Existing COM Port PC Applications - Royalty-Free Distribution License - Windows 98SE/2000/XP - MAC OS-9 - MAC OS-X - Windows CE* - Linux 2.40 (currently supports binary only) Example Applications - Upgrade of RS-232 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 Package - 28-pin MLP (5 x 5 mm) Temperature Range: -40 to +85 °C CP2101 Voltage IN Regulator VDD RST OUT SUSPEND 6 3 8 USB CONNECTOR VBUS DD+ GND 3.3 V VDD GND RI 48 MHz Oscillator VBUS 3 4 DCD DTR 1 2 SUSPEND 5 4 DD+ USB Transceiver USB Function Controller UART 5 6 512B 512B 512B TX RX EEPROM Buffer Buffer DSR TXD RXD RTS CTS 9 12 11 (to external circuitry for USB suspend states) 2 1 28 27 External RS-232 transceiver or UART circuitry 26 25 24 23 Example System Diagram Rev. 1.6 1/05 Copyright © 2005 by Silicon Laboratories CP2101 CP2101 2 Rev. 1.6 CP2101 Table of Contents 1. System Overview..................................................................................................... 4 2. Absolute Maximum Ratings ................................................................................... 4 Table 2.1. Absolute Maximum Ratings...................................................................... 4 3. Global DC Electrical Characteristics .................................................................... 5 Table 3.1. Global DC Electrical Characteristics ........................................................ 5 Table 3.2. UART and Suspend I/O DC Electrical Characteristics ............................. 5 4. Pinout and Package Definitions............................................................................. 6 Table 4.1. Pin Definitions for the CP2101 ................................................................. 6 Figure 4.1. MLP-28 Pinout Diagram (Top View) ....................................................... 7 Figure 4.2. MLP-28 Package Drawing ...................................................................... 8 Table 4.2. MLP-28 Package Dimensions .................................................................. 8 Figure 4.3. Typical MLP-28 Landing Diagram .......................................................... 9 Figure 4.4. Typical MLP-28 Solder Mask ................................................................ 10 5. USB Function Controller and Transceiver .......................................................... 11 Figure 5.1. Typical Connection Diagram ................................................................. 11 6. Asynchronous Serial Data Bus (UART) Interface............................................... 12 Table 6.1. Data Formats and Baud Rates............................................................... 12 7. Internal EEPROM ................................................................................................... 12 Table 7.1. Default USB Configuration Data............................................................. 12 8. Virtual Com Port Device Drivers .......................................................................... 13 9. Voltage Regulator.................................................................................................. 14 Table 9.1. Voltage Regulator Electrical Specifications............................................ 14 Figure 9.1. Configuration 1: USB Bus-Powered ..................................................... 14 Figure 9.2. Configuration 2: USB Self-Powered ..................................................... 15 Figure 9.3. Configuration 3: USB Self-Powered, Regulator Bypassed ................... 15 Rev. 1.6 3 CP2101 1. System Overview The CP2101 is a highly-integrated USB-to-UART Bridge Controller providing a simple solution for updating RS-232 designs to USB using a minimum of components and PCB space. The CP2101 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 MLP-28 package. 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 CP2101based product to appear as a COM port to PC applications. The CP2101 UART interface implements all RS-232 signals, including control and handshaking signals, so existing system firmware does not need to be modified. 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 CP2101. An evaluation kit for the CP2101 (Part Number: CP2101EK) is available. It includes a CP2101-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 CP2101 Evaluation Kit. 2. Absolute Maximum Ratings Table 2.1. 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 with respect to GND –0.3 — 4.2 V Maximum Total current through VDD and GND — — 500 mA Maximum output current sunk by RST or any I/O pin — — 100 mA Note: stresses above those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress rating only and functional operation of the devices at those or any other conditions above those indicated in the operation listings of this specification is not implied. Exposure to maximum rating conditions for extended periods may affect device reliability. Rev. 1.6 4 CP2101 3. Global DC Electrical Characteristics Table 3.1. Global DC Electrical Characteristics VDD = 2.7 to 3.6 V, –40 to +85 °C unless otherwise specified Parameter Conditions Supply Voltage Min Typ Max Units 3.0 3.3 3.6 V Supply Current VDD = 3.3 V — 25 — mA Supply Current in Suspend VDD = 3.3 V — 325 — µA –40 — +85 °C Specified Operating Temperature Range Table 3.2. UART and Suspend I/O DC Electrical Characteristics VDD = 2.7 to 3.6 V, -40 to +85 °C unless otherwise specified Parameters Conditions Min IOH = -3mA VDD-0.7 Output High Voltage IOH = -10µA UNITS V VDD-0.8 0.6 IOL = 10µA 0.1 V 0.8 50 V V µA 1.0 IOL = 25mA Input High Voltage Input Low Voltage Input Leakage Current 5 Max VDD-0.1 IOH = -10mA IOL = 8.5mA Output Low Voltage Typ 2.0 25 Rev. 1.6 CP2101 4. Pinout and Package Definitions Table 4.1. Pin Definitions for the CP2101 Name Pin # Type Power In Description 3.0–3.6 V Power Supply Voltage Input. VDD 6 GND 3 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+ 4 D I/O USB D+ D– 5 D I/O USB D– TXD 26 D Out Asynchronous data output (UART Transmit) RXD 25 D In Asynchronous data input (UART Receive) CTS 23* D In Clear To Send control input (active low) RTS 24* D Out Ready to Send control output (active low) DSR 27* D in Data Set Ready control input (active low) Power Out 3.3 V Voltage Regulator Output. See Section 9. Ground DTR 28* D Out DCD 1* D In Data Terminal Ready control output (active low) Data Carrier Detect control input (active low) RI 2* D In Ring Indicator control input (active low) SUSPEND 12* D Out This pin is driven high when the CP2101 enters the USB suspend state. SUSPEND 11* D Out This pin is driven low when the CP2101 enters the USB suspend state. NC 10, 13–22 These pins should be left unconnected or tied to VDD. *Note: Pins can be left unconnected when not used. Rev. 1.6 6 DTR DSR TXD RXD RTS CTS NC 27 26 25 24 23 22 GND 28 CP2101 DCD 1 21 NC RI 2 20 NC GND 3 19 NC D+ 4 18 NC D- 5 17 NC VDD 6 16 NC 15 NC CP2101 Top View GND 12 13 14 SUSPEND NC NC 10 NC 11 9 RST SUSPEND 8 7 VBUS REGIN Figure 4.1. MLP-28 Pinout Diagram (Top View) 7 Rev. 1.6 CP2101 Table 0.1. MLP-28 Package Dimensions 14 13 12 11 10 9 8 Bottom View L 7 15 16 D2 5 17 D2 2 e E2 4 20 2 21 22 23 24 25 26 27 DETAIL 1 28 1 18 19 E2 2 3 R 6xe E b 6 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 4.2. MLP-28 Package Drawing Rev. 1.6 8 CP2101 0.50 mm 0.35 mm 0.50 mm 0.10 mm 0.85 mm 0.30 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 4.3. Typical MLP-28 Landing Diagram 9 Rev. 1.6 D D2 Optional GND Connection CP2101 0.50 mm 0.35 mm 0.50 mm 0.60 mm 0.20 mm 0.10 mm 0.85 mm 0.30 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 4.4. Typical MLP-28 Solder Mask Rev. 1.6 10 CP2101 5. USB Function Controller and Transceiver The Universal Serial Bus function controller in the CP2101 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 CP2101 device as well as external circuitry. The CP2101 will enter Suspend mode when Suspend signaling is detected on the bus. On entering Suspend mode, the CP2101 asserts the SUSPEND and SUSPEND signals. SUSPEND and SUSPEND are also asserted after a CP2101 reset until device configuration during USB Enumeration is complete The CP2101 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 CP2101 reset. If this behavior is undesirable, a strong pulldown (10 kΩ) can be used to ensure SUSPEND remains low during reset. See Figure 5.1 for other recommended options. VDD CP2101 7 R1 4.7 kΩ C1 1 µF RST SUSPEND 6 C4 4.7 µF TANT C2 0.1 µF 3 VDD SUSPEND GND RI Option 2 8 USB CONNECTOR VBUS DD+ GND DCD VBUS DTR DSR 1 2 5 3 4 4 5 6 D1 D2 Option 1 REGIN D- TXD D+ RXD RTS D3 Option 3 CTS 9 (to external circuitry for USB suspend states) 12 11 R2 10 kΩ 2 1 28 27 Option 4 External RS-232 transceiver or UART circuitry 26 25 24 23 Option 1: A 4.7 kΩ pull-up resistor can be added to increase noise immunity. Option 2: A 4.7 µF tantalum capacitor can be added if powering other devices from the on-chip regulator. Option 3: Avalanche transient voltage suppression diodes can be added for ESD protection. Option 3: Use Littlefuse p/n SP0503BAHT or equivalent. Option 4: 10 kΩ resistor to ground to hold SUSPEND low on initial power on or device reset. Figure 5.1. Typical Connection Diagram 11 Rev. 1.6 CP2101 6. Asynchronous Serial Data Bus (UART) Interface The CP2101 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/XOff 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 6.1. Table 6.1. Data Formats and Baud Rates 7. Data Bits 8 Stop Bits 1 Parity Type None, Even, Odd Baud Rates 300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800, 38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600 Internal EEPROM The CP2101 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 7.1 is used. However, a unique serial number is required for OEM applications in which it is possible for multiple CP2101-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 CP2101 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. Table 7.1. 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 “CP2101 USB to UART Bridge Controller” (126 characters maximum) Rev. 1.6 12 CP2101 8. Virtual Com Port Device Drivers The CP2101 Virtual COM Port (VCP) device drivers allow a CP2101-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 CP2101-based device as it would access a standard hardware COM port. However, actual data transfer between the PC and the CP2101 device is performed over the USB. Therefore, existing COM port applications may be used to transfer data via the USB to the CP2101-based device without modifying the application. Contact Silicon Laboratories for the latest list of supported operating systems. Note: The Silicon Laboratories VCP device drivers are required for device operation and are only distributed as part of the CP2101 Evaluation Kit (Part Number: CP2101EK). Contact any of Silicon Lab’s sales representatives or go to www.silabs.com to order the CP2101 Evaluation Kit. The CP2101 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. 13 Rev. 1.6 CP2101 9. Voltage Regulator The CP2101 includes an on-chip 5-to-3 V voltage regulator. This allows the CP2101 to be configured as either a USB bus-powered device or a USB self-powered device. These configurations are shown in Figure 9.1 and Figure 9.2. When enabled, the 3 V voltage regulator output appears on the VDD pin and can be used to power external 3V devices. See Table 9.1 for the voltage regulator electrical characteristics. Alternatively, if 3 V power is supplied to the VDD pin, the CP2101 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 9.3. The USB max power and power attributes descriptor must match the device power usage and configuration. See application note “AN144: CP2101 Customization Guide” for information on how to customize USB descriptors for the CP2101. 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 9.1. 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 — 90 TBD µA Input Voltage Range Output Voltage Output Current = 1 to 100 mA* * The maximum regulator supply current is 100 mA. CP2101 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 9.1. Configuration 1: USB Bus-Powered Rev. 1.6 14 CP2101 CP2101 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 9.2. Configuration 2: USB Self-Powered CP2101 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 9.3. Configuration 3: USB Self-Powered, Regulator Bypassed 15 Rev. 1.6 CP2101 Document Change List Revision 1.5 to Revision 1.6 „ “Virtual COM Port Device Drivers” on page 1 - Added SE after Windows 98 - Changed “Linux 2.40 and greater” to “Linux 2.40 (currently supports binary only)” Rev. 1.6 16 CP2101 Notes: 17 Rev. 1.6 CP2101 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. 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Silicon Laboratories and Silicon Labs are trademarks of Silicon Laboratories Inc. Other products or brandnames mentioned herein are trademarks or registered trademarks of their respective holders Rev. 1.6 18