CP2108-EK CP2108 E VALUATION K IT U SER ’ S G UIDE 1. Introduction The CP2108 is a highly integrated USB-to-Quad-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 CP2108 includes a USB 2.0 full-speed function controller, USB transceiver, oscillator, EEPROM, and four asynchronous serial data buses (UART) with full modem control signals in a compact 9 mm x 9 mm QFN-64 package. Figure 1. CP2108 USB-to-Quad UART Bridge Controller Evaluation Board 2. Kit Contents The CP2108 Evaluation Kit contains the following items: CP2108 evaluation board RS232 serial cables USB cable Quick Start Guide Four 3. Software Setup The software package for the CP2108 kit (https://www.silabs.com/products/interface/usbtouart/Pages/usb-to-uart-bridge.aspx) contains the following: Drivers (Side Menu Under Tools Download VCP Drivers) Documentation: (Click the Documentation Tab) CP210x CP2108 CP2108 data sheet Evaluation Kit User's Guide (this document) Follow the instructions in the CP210x installer to install the desired drivers on the system. Note: The VCP driver installation process for Windows is a two phase process. First, the files needed for the driver installation are unpacked to a location on the computer. Then, the unpacked files are used to install the Virtual COM Port driver. Rev. 0.2 10/12 Copyright © 2012 by Silicon Laboratories CP2108-EK CP2108-EK 4. CP2108 Hardware Interface Connect the CP2108 evaluation board to a PC as shown in Figure 2. 1. Connect one end of the USB cable to a USB Port on the PC. 2. Connect the other end of the USB cable to the USB connector on the CP2108 evaluation board. 3. Connect one end of the RS232 serial cable to one of the DB9 connectors on the CP2108 evaluation board. 4. Connect the other end of the RS232 serial cable to the target serial device. 5. To connect to additional serial devices, repeat Steps 3 and 4 using another RS232 serial cable and one of the unused DB9 connectors on the CP2108 evaluation board. Serial Device RS232 USB RS232 Serial Device CP2108 USB-toQuad-UART Bridge Serial Device RS232 CP2108 EK Figure 2. Hardware Setup 2 Rev. 0.2 RS232 Serial Device CP2108-EK 5. CP2108 Software Interface The CP2108 will appear as four COM ports in the Device Manager, as shown in Figure 3. The CP2108 will always use the lowest available COM port for operation. For instance, if COM flash 1 through 6 are in use by other peripherals and applications, the CP2108 will use COM7, COM8, COM9, and COM10. The CP2108 functions identically to a COM port from the reference point of both the host application and the serial device, and it can support serial device control requests defined in the Microsoft Win32® Communications API. Figure 3. CP210x in Device Manager Using the VCP Driver Rev. 0.2 3 CP2108-EK 6. Detailed Hardware Description The CP2108 Evaluation Kit includes an evaluation board with a CP2108 device pre-installed for evaluation and preliminary software development. Numerous input/output (I/O) connections are provided to facilitate prototyping using the evaluation board. Refer to Figure 4 for the locations of the various I/O connectors. P0-3 P4 J0-3 J4 DS8 J5 J6 J7 J8 J9 J10 J11 DS0-DS7 DB9 connectors for the RS232 interface USB connector for USB interface UART signal access connector SUSPEND LED connector Red SUSPEND indicator LED Board Power Selector (bus- or self-powered) GPIO0-7 LED Connector GPIO8-15 Rx/Tx Toggle Pins VBUS Pin Connection for current measurements +3V/VDD Connector Option VIO/VDD Connector Option NC Pins, GND Green GPIO LEDs Pin 2 J0 J11 J9 P4 P3 Pin 1 J8 RS232 Transceiver J5 J10 CP2108 J3 J1 Pin 2 P0 Pin 1 RS232 Transceiver Pin 2 P2 Pin 1 RS232 Transceiver RS232 Transceiver Pin 1 P1 J7 Pin 1 Pin 1 J4 J6 Pin 2 DS0 DS1 DS2 DS3 DS4 DS5 DS6 DS8 SUSPEND LED J2 Pin 2 Figure 4. CP2108 Evaluation Board with Default Shorting Blocks Installed 4 Rev. 0.2 CP2108-EK 6.1. DB9 Connector for RS232 Interface (P0-P3, J0-J3) Four RS232 transceiver circuits and DB9 connectors (P0-3) are provided on the evaluation board to connect the CP2108 virtual serial ports to external serial devices. The headers J0-3 connect the CP2108 pins to the DB9 connectors and provide access to the RS232 signals. See Table 1 for the RS232 P0-3 pin descriptions and Table 2 for J0, J1, J2, J3 pin descriptions. Table 1. RS232 Connector (P0-3) Pin Descriptions Pin Signal 1 2 3 4 5 6 7 8 9 DCD RXD TXD DTR GND DSR RTS CTS RI CP2108 Direction Input Input Output Output Input Output Input Input Description Data Carrier Detect Receive Data Transmit Data Data Terminal Ready Ground Data Set Ready Request to Send Clear to Send Ring Indicator Table 2. RS232 Header (J0-3) Pin Descriptions Pins Signal CP2108 Direction Description 1-2 3-4 5-6 7-8 9-10 11-12 13-14 15-16 TXD RXD DTR RI DCD DSR CTS RTS Output Input Output Input Input Input Input Output Transmit Data Receive Data Data Terminal Ready Ring Indicator Data Carrier Detect Data Set Ready Clear to Send Request to Send 6.2. Board Power Selector (J5) This header (J5) provides bus- or self-powered options for the CP2108 device. Pins 1-2 connect USB connector VBUS (P4) to the VREGIN pin on the CP2108 and puts the device in bus powered mode. The voltage regulator output appears on the VDD pin (pin 3). Pins 2-3 connect the CP2108 VREGIN to the CP2108 VDD pin and puts the device in self-powered mode. This bypasses the voltage regulator. A voltage of 1.8 to 3.6 V power must be supplied to the VDD pin. 6.3. Power Connectors (J9, J10) The J9 and J10 headers are included on the evaluation board to provide several power options. J9 connects the main +3 V net to the CP2108 VDD pin. The VDD pin is the output of the on-chip regulator. The main +3 V net powers the other components (green LEDs and RS-232 transceivers) on the board. It can be disconnected using J9 for current measurement purposes. J10 connects the CP2108 VIO input to the CP2108 VDD pin. Remove the shorting block to power VIO from an external source. Rev. 0.2 5 CP2108-EK 6.4. VBUS Connector (J8) The VBUS connector J8 connects the VBUS pin on the USB connector (P4) to the CP2108 VBUS pin. If the jumper is removed and a multimeter is inserted, the power consumption can be measured. 6.5. GPIO.0-7 LED Header (J6) Place shorting blocks on J6 to connect the GPIO.0–7 pins to the eight green LEDs (DS0-DS7). These LEDs can be used to indicate active communications through the CP2108. Table 3 shows the LED corresponding to each header position. When using the CP2108 in modem mode, the shorting blocks on J6 should be removed. Table 3. J6 LED Locations LED J6 Pins DS0 1-2 DS1 3-4 DS2 5-6 DS3 7-8 DS4 9-10 DS5 11-12 DS6 13-14 DS7 15-16 6.6. GPIO.8-15 Header (J7) The J7 header allows access to the GPIO.8-15 pins on the CP2108. These GPIO pins may be connected to the LEDs using J6 or used for alternate functions described in the CP2108 data sheet. 6.7. Universal Serial Bus (USB) Interface (P4) A Universal Serial Bus (USB) connector (P4) is provided to facilitate connections to the USB interface on the CP2108. See Table 4 for the USB pin definitions. Table 4. USB Connector Pin Descriptions Pin # Description 1 2 3 4 VBUS DD+ GND (Ground) 6.8. SUSPEND LED Header (J4) The J4 header enables the DS8 LED on the SUSPEND output pin on the CP2108. 6 Rev. 0.2 Figure 5. CP2108 Evaluation Kit Board Schematic (1 of 2) CP2108-EK 7. Schematic Rev. 0.2 7 Figure 6. CP2108 Evaluation Kit Board Schematic (2 of 2) CP2108-EK 8 Rev. 0.2 CP2108-EK NOTES: Rev. 0.2 9 CP2108-EK 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 Please visit the Silicon Labs Technical Support web page: https://www.silabs.com/support/pages/contacttechnicalsupport.aspx and register to submit a technical support request. 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