Innoesys Usb To Serial Breakout+ Cp2102

US $290

Athens, Petroupoli, Greece
Jun 24th

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1. Overview DEVO-2102 is based on CP2102 USB-to-UART IC and serves as breakout for the mentioned IC providing also additional functions. CP2102 from Silicon labs is a USB 2.0 full-speed controller which includes a USB transceiver, oscillator, EEPROM and UART (Universal Asynchronous Receiver Transmitter) controller with full modem control signals. The board includes two independent LEDs for the UART receive/transmit signal which can be connected or disconnected by the user using jumpers. Their primary purpose is to serve as debug indicators for the UART data signals (very useful in prototyping systems). Moreover, a third power-indicator LED could be connected or disconnected using a jumper for power indication of the USB bus. The board holds a Type-B USB connector in order to be connected with the USB host controller. 2. Board description 1. Connections DEVO-2102 provides connections to the entire set of CP2102 pins through double header (2x13 pin) as well as connections to the USB signals (1x4 pin header). CP2102 pinout description: Signal Direction Description +3.3V Power 3.3V CP2102 voltage regulator output @100mA (max) DCD Input Data Carrier Detect control input (active low) RXD Input Asynchronous data input (UART Receive) TXD Output Asynchronous data output (UART Transmit) DTR Output Data Terminal Ready control output (active low) DSR Input Data Set Ready control input (active low) RTS Output Ready to Send control output (active low) CTS Input Clear To Send control input (active low) RI Input Ring Indicator control input (active low) nSPND Output This pin is driven low when the CP2102 enters the USB suspend state SPND Output This pin is driven high when the CP2102 enters the USB suspend state nRST Input CP2102 reset signal (active low) GND Power Board ground (0 V) USB signals: Signal Direction Description VBUS Power USB bus power (5 V) D+ Input/Output USB bus data signal D- Input/Output USB bus data signal GND Power USB bus ground 2. Configuration The only configuration required is to set the connections for the UART receive/transmit LEDs and the USB power-indicator LED. These LEDs, as mentioned above, are configures via jumpers and can be set in connected or disconnected state. UART receive/transmit LEDs configuration: UART RX (receive) and TX (transmit) LEDs are configured by jumpers P5 and P6 respectively. The figure below depicts the mentioned jumpers (blue rectangles) at set state (connecting the LEDs to the UART signals). Fig. 2. UART RX and TX LEDs configuration: a) UART receive LED configuration (LED D2) b) UART transmit LED configuration (LED D3). USB power indicator: DEVO-2102 board incorporates a USB power-indicator LED (LED D1) which is connected through P4 jumper. Fig. 3 shows the connection of the LED using a jumper (red rectangle). Fig. 3. USB power-indicator LED. 3. UART Connections UART communication is implemented either with flow or without flow control. Fig. 4 describes the connections necessary for these two types of communication interfaces. TX line carries data from UART A (usually called DTE – Data Terminal Equipment) to UART B (usually called DCE – Data Circuit-terminating Equipment). RX signal carries data from DCE to DTE station. The GND power line is connected between the two stations for voltage reference. In communication without flow control three lines are used: TX, RX and GND. The remaining UART lines are control and status signals. The most links use RTS/CTS flow control signals. In this case, the DCE station sets CTS line when ready to receive data while DTE asserts RTS signal to indicate the data ready mode. Obviously, in RTS/CTS flow control in addition to the RX, TX and GND lines, RTS, CTS and DCD lines are used for the data flow control. The links that use DTR/DSR flow control use DTR and DSR lines in addition to RX, TX and GND signals. When DTE is ready to communicate it sets the line DTR while DSR is set by the DCE when it is ready to receive data. RI line can have any use if it is not used for detecting a ring signal on a phone line. 4. Software tools In order to use DEO-2102, CP2102 VCP (Virtual Com Port) drivers are required which can be downloaded by Silicon Labs: https://www.silabs.com/products/mcu/Pages/USBtoUARTBridgeVCPDrivers.aspx 5. Additional information More information regarding CP2102 can be obtained from the CP2102 datasheet: http://www.silabs.com/Support%20Documents/TechnicalDocs/CP2102-9.pdf 6. Board dimensions All dimensions are in mm. Fig. 5. DEVO-2102 board dimensions