![]() For advanced users interested in these features, we recommend careful reading of the CP2102N datasheet (619k pdf). ![]() You do not need to be familiar with details of the CP2102N to use this board as a basic USB-to-serial adapter, but the CP2102N also has specialized features including four general-purpose I/O (GPIO) pins and the ability to be customized by configuring its internal EEPROM. This schematic is also available as a downloadable PDF (169k pdf). ![]() Warning: We do not recommend externally supplying VIO to this board while it is not connected to USB, as this can cause it to draw excessive current (up to a few hundred milliamps). You can then solder a thin wire to the exposed via labeled “VIO” and connect it to a separate voltage supply (as low as 1.71 V). If you want to use a lower logic voltage, you can disconnect VIO from VDD by cutting the thin trace between the two pads of the surface-mount jumper shown to the right. This carrier board connects the VIO pin of the CP2102N to VDD by default, setting its logic voltage level to the 3.3 V provided by the IC’s built-in voltage regulator. You can also solder wires directly to the pads for the smallest installation. The carrier board ships with a 1×25 straight male header strip, a 1×6 right-angle male header strip, and a 1×6 right-angle female header as shown below. As a result, this CP2102N adapter board can be used as a drop-in replacement for an FTDI cable in many applications, such as programming Arduino-compatible boards.ĬP2102N USB-to-serial adapter carrier in a breadboard with included 0.1″ male headers installed.ĬP2102N USB-to-serial adapter carrier with included 6-pin 0.1″ right-angle female header installed. This gives access to six signals (RTS, RX, TX, VBUS, CTS, and GND) that are commonly found on FTDI cables and other similar USB-to-serial adapters. This allows any pin to be accessed easily while the adapter is plugged into a solderless breadboard, as shown in the left picture below.Īlternatively, a 1×6 header can be soldered to the end of the board, as shown in the right picture below. "Ring indicator" control input (active low)Īll of the adapter’s pins are available in two rows spaced 0.5″ apart along the sides of the board. "Data carrier detect" control input (active low) "Data terminal ready" control output (active low) (often used with DSR) "Data set ready" control input (active low) (often used with DTR) “Ready to send” control output (often used with CTS) “Clear to send” control input (often used with RTS) Supported baud rates: 300 bps to 3 MbpsĪsynchronous serial data transmit (idle high).Logic voltage level: 3.3 V (5 V tolerant).Dimensions: 0.6″ × 0.95″ including connector.In addition to its functionality as an AVR programmer, it can be used as a USB-to-TTL serial adapter with two configurable serial handshaking lines and support for both 3.3 V and 5 V operation.įor most applications, this CP2102N carrier can be considered a drop-in replacement for our older CP2104 USB-to-Serial Adapter Carrier with a few improvements like a higher maximum baud rate and re-programmable configuration ROM. If you do not need access to all of the serial control signals, consider the Pololu USB AVR Programmer v2.1 as an alternative. This product requires a USB A to Micro-B cable (not included) to connect to a computer. Drivers are available from Silicon Labs for Windows XP, Windows Vista, Windows 7, Windows 8, Windows 10, Linux, and Mac OS X. The CP2102N is a full-speed USB 2.0 device and allows baud rates of up to 3 Mbps. The adapter looks like a standard virtual serial port (COM port) to the computer’s operating system, which means it can be used with any software designed to work with a serial port (even a legacy RS-232 port). The green LED on the SUSPEND line indicates an active USB connection when lit. This board uses 3.3 V signal levels by default, but the signal pins can tolerate higher voltages, allowing the adapter to be used with 5 V systems that see 3.3 V as a logic high. It offers several options for accessing the data, control, and GPIO pins on the CP2102N, all of which are made available on a 0.1″ spacing. ![]() The tiny unit measures only 0.6″ × 0.95″ including its Micro-USB connector. This USB-to-serial adapter is a breakout board for the Silicon Labs CP2102N USBXpress USB-to-UART bridge, and it is a great solution for connecting microcontroller projects and other logic-level serial devices to a personal computer. CP2102N USB-to-serial adapter carrier, bottom view with dimensions. ![]()
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