CP2101

CP2101 SILABS | Alldatasheet

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Single-Chip USB to UART Bridge CP2101 Rev. 1.8 5/07 Copyright © 2007 by Silicon Laboratories CP2101 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 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 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 2.40 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 - 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 - Pb-free 28-pin QFN (5 x 5 mm) Ordering Part Number - CP2101-GM Temperature Range: -40 to +85 °C Note: The CP2101 is a mature product and is not rec - ommended for new designs. The CP2102 is a pin and software compatible alternative for the CP2101. The CP2102 is recommended for all new designs. Example System Diagram CP2101 3.3 V Voltage Regulator

48 MHz

D–5 UART RI DCD CTS RTS RXD TXD DSR DTR External RS-232 transceiver or UART circuitry (to external circuitry for USB suspend states) VBUS GND 4 USB CONNECTOR VDD VBUS USB Function Controller USB Transceiver 512B TX Buffer 512B RX Buffer 512B EEPROM VDD D1 D2 D3

2 Rev. 1.8

4 Rev. 1.8 NOTES:

Rev. 1.8 5 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 componen ts 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 QFN-28 package. No other external USB components are required. The on-chip EEPROM may be used to customiz e the USB Vendor ID, Product ID, Product Description String, Power Descriptor, Device Release Number and Device Serial Number as desired for OEM applica - tions. The EEPROM is programmed on-board via the USB allowing the programming step to be easily inte- grated into the product manufacturing and testing process. Royalty-free Virtual COM Port (VCP ) device drivers provided by Silic on Laboratories allow a CP2101- based product to appear as a COM port to PC app lications. The CP2101 UART interface implements all RS-232 signals, including control an d 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. Direct access driver support is available through the Silicon Laboratories USBXpress driver set. The CP2101 is a mature product and is not recommended for new designs. The CP2102 is a pin and soft- ware compatible alternative for the CP2101. The CP2102 is recommended for all new designs. Contact Silicon Laboratories customer support at www.silabs.com for any questions about replacing the CP2101. 2. Absolute Maximum Ratings Table 2.1. Absolute Maximum Ratings 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. 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 —— 5 0 0 m A Maximum output current sunk by RST or any I/O pin —— 1 0 0 m A

6 Rev. 1.8 3. Global DC Electrical Characteristics Table 3.1. Global DC Electrical Characteristics VDD = 3.0 to 3.6 V, –40 to +85 °C unless otherwise specified. 1. USB Pull-up Current should be added for total supply current. 2. The USB Pull-up supply current values are calculated values based on USB specifications. Table 3.2. UART and Suspend I/O DC Electrical Characteristics VDD = 3.0 to 3.6 V, -40 to +85 °C unless otherwise specified. IOH = –3 mA IOH = –10 µA IOH = –10 mA VDD – 0.7 VDD – 0.1 VDD – 0.8 IOL = 8.5 mA IOL = 10 µA IOL = 25 mA 1.0 0.6 0.1 Table 3.3. Reset Electrical Characteristics -40°C to +85°C unless otherwise specified. Parameter Conditions Min Typ Max Units /RST Output Low Voltage IOL = 8.5 mA, VDD = 3.0 V to 3.6 V — — 0.6 V /RST Input High Voltage 0.7 x VDD — — V /RST Input Low Voltage — — 0.3 x VDD /RST Input Pull-Up Current /RST = 0.0 V — 25 40 µA Minimum /RST Low Time to Generate a System Reset 15 — — µs Parameter Conditions Min Typ Max Units Supply Voltage 3.0 3.3 3.6 V Supply Current1 Normal Operation; VREG Enable —2 22 6 m A Supply Current1 Suspended; VREG Enable — 78 200 µA Supply Current - USB Pull-up2 — 200 228 µA Specified Operating Temperature Range –40 — +85 °C Notes: Parameters Conditions Min Typ Max Units Output High Voltage V Output Low Voltage V Input High Voltage 2.0 — — V Input Low Voltage —— 0 . 8 V Input Leakage Current —2 55 0 µ A

Rev. 1.8 7 4. Pinout and Package Definitions Table 4.1. Pin Definitions for the CP2101 Name Pin # Type Description VDD 6 Power In Power Out 3.0–3.6 V Power Supply Voltage Input. 3.3 V Voltage Regulator Output. See Section 9. GND 3 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 regula- tor. 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) DTR 28* D Out Data Terminal Ready control output (active low) DCD 1* D In 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.

8 Rev. 1.8 Figure 4.1. QFN-28 Pinout Diagram (Top View)

Table 4.2. QFN-28 Package Dimensions Dimension Min Nom Max Dimension Min Nom Max 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-020C specification for Small Body Components. CP2101 Rev. 1.8 9 Figure 4.2. QFN-28 Package Drawing A3 0.25 REF aaa 0.15 b 0.18 0.25 0.30 bbb 0.10 D 5.00 BSC. ddd 0.05 D2 2.90 3.15 3.35 eee 0.08 e 0.50 BSC. Z 0.435 E 5.00 BSC. Y0 . 1 8 Notes:

10 Rev. 1.8 Figure 4.3. Typical QFN-28 Landing Diagram

Rev. 1.8 11 Figure 4.4. Typical QFN-28 Solder Paste Recommendation

12 Rev. 1.8 5. USB Function Contro ller 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 fu nction 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 Su spend mode when Suspend si gnaling is detected on the bus. On entering Suspend mode, th e CP2101 asserts the SUSPEND and SUSPEND signals. SUSPEND and SUSPEND are also asserted after a CP2101 rese t 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 undesir - able, a strong pulldown (10 kΩ) can be used to ensure SUSPEND remains low during reset. See Figure 5.1 for other recommended options. Option 1: A 4.7 k Ω pull-up resistor can be added to increase noise immunity. Option 2: A 4.7 µF 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 k Ω resistor to ground to hold SUSPEND low on initial power on or device reset. CP2101 SUSPEND SUSPEND REGIN7 GND3 RST 9 D+4 D-5 0.1 µF 1 µF RI DCD CTS RTS RXD TXD DSR DTR External RS-232 transceiver or UART circuitry (to external circuitry for USB suspend states) VBUS GND 4 USB CONNECTOR

6 VDD

4.7 k Ω D1 D2 D3 Option 1 10 kΩ Option 4 Option 3 4.7 µF Option 2 Figure 5.1. Typical Connection Diagram 6. Asynchronous Serial Data Bus (UART) Interface The CP2101 UART interface consists of the TX (trans mit) 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.

Rev. 1.8 13 The UART is programmable to support a variety of dat a 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 CP 2101 is configured th rough the USBXpress API. The data formats and baud rates available are listed in Table 6.1. Table 6.1. Data Formats and Baud Rates 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 7. Internal EEPROM The CP2101 includes an internal EEPROM that may be used to customize the USB Vendor ID (VID), Prod- uct 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 7.1 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 will prev ent the driver from conflicting with any other USB driver. A vendor ID can be obtained from www.usb.org or Silicon Laboratories 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 CP2101-based devices to be connected to the same PC. The internal EEPROM is programmed via the USB. Th is allows the OEM's USB configuration data and serial number to be written to the CP2101 on-boar d 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 num - ber management during manufacturing . The EEPROM has a typi cal endurance of 1 00,000 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)

14 Rev. 1.8 8. CP2101 Device Drivers There are two sets of device drivers available for the CP2101 devices: the Virtual COM Port (VCP) drivers and the USBXpress Direct Ac cess drivers. Only one set of driver s 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 CP2101 Virtual COM Port (VCP) device drivers allow a CP2101-based device to appear to the PC's application software as a COM port . Application software running on the PC accesses the CP2101-based device as it would access a standard hardware COM po rt. However, actual data transfer between the PC and the CP2101 device is performed over the USB in terface. Therefore, existi ng COM port applications may be used to transfer data via the USB to the CP2101-based device without modifying the application. See Application Note AN197: Code for Example Code for Interfacing to a CP2102 using the Virtual COM drivers. 8.2. USBXpress Drivers The Silicon Laboratories USBXpress drivers provide an alte rnate solution for interfacing with CP2102 devices. No Serial Port protocol expertise is requir ed. Instead, a simple, high-level application program interface (API) is used to provid e simpler CP201x connect ivity and functionality. The USBXpress for CP210x Development Kit includes Windows device driv ers, Windows device driver installer and uninstall - ers, 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 soft- ware. The USBXpress inte rface is described in Application Note “AN169 : USBXpress Programmer's Guide.” 8.3. Driver Customization In addition to customizing the device as described in Sectio n 7. "Internal EEPROM" on page 13, the driv- ers and the drivers installation package can be also be customized. See App lication Note “AN220: USB Driver Customization” for more information on generating customized VCP and USBXpress drivers. 8.4. Driver Ce rtification The default drivers that are shipped with the CP21 01 are Microsoft WHQL (Win dows Hardware Quality Labs) certified. The certification means that the drivers have been tested by Microsoft and their latest operating systems (XP and Vista) will allow the drivers to be installed without any warnings or errors. The customized drivers that are generated using the AN220 software are not automatically certified. They must go first through the Microsoft Driver Reseller Submission process. Contact Silicon Laboratories sup- port for assistance with this process.

Rev. 1.8 15 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-pow ered 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 configura - tion. 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 pro- vided on the REGIN input. Table 9.1. Voltage Regulator Electrical Specifications –40 to +85 °C unless otherwise specified. Parameter Conditions Min Typ Max Units Input Voltage Range 4.0 — 5.25 V Output Voltage Output Current = 1 to 100 mA* 3.0 3.3 3.6 V VBUS Detection Input Threshold 1.0 1.8 4.0 V Bias Current — 90 TBD µA *Note: The maximum regulator supply current is 100 mA. Voltage Regulator (REG0)5 V In

3 V Out

Figure 9.1. Configuration 1: USB Bus-Powered

Voltage Regulator (REG0)5 V In Voltage Regulator (REG0)5 V In 16 Rev. 1.8 Figure 9.2. Configuration 2: USB Self-Powered Figure 9.3. Configuration 3: USB Self-Powered, Regulator Bypassed

Rev. 1.8 17 10. Relevant Application Notes The following Application Notes are applicable to the CP2101. The latest versions of these application notes and their accompanying software are available at: http://www.silabs.com/products/microcontroller/applications.asp. AN144: CP210x Device Customization Guide . This application note describes how to use the AN144 software to configure the USB parameters on the CP2101 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 CP2101 and includes example code. AN220: CP210x USB Driver Customization. This application note describes how to use the AN220 soft- ware to customize the VCP or USBXpress drivers with OEM information.

18 Rev. 1.8 DOCUMENT CHANGE LIST Revision 1.6 to Revision 1.7 „ Updated “Linux 2.40” bullet on page 1. „ Changed MLP to QFN throughout. Revision 1.7 to Revision 1.71 „ Removed “Windows CE” bullet from page 1. Revision 1.71 to Revision 1.8 „ Added note on pages 1 and 4 regarding CP2101 not recommend for new designs. „ Added additional supported operating systems on page 1. „ Added values to Table 3.1, “Global DC Electrical Characteristics,” on page 6. „ Updated package drawings in Figure 4.2, Figure 4.3, and Figure 4.4. „ Changed Figure 4.4 title. „ Removed tantalum requirement in Figure 5.1. „ Updated Section 8. "CP2101 Device Drivers" on page 14 with USBXpress, customization, and certification information. „ Added Section 10. "Relevant Application Notes" on page 17.

Rev. 1.8 19 NOTES:

20 Rev. 1.8 CONTACT INFORMATION Silicon Laboratories Inc.

400 West Cesar Chavez

Austin, TX 78701 Tel: 1+(512) 416-8500 Fax: 1+(512) 416-9669 Toll Free: 1+(877) 444-3032 Email: MCUtools@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 function- ing 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 and Silicon Labs are trademarks of Silicon Laboratories Inc. Other products or brandnames mentioned herein are trademarks or registered trademarks of their respective holders