Pololu USB to Serial Adapter - CP2102N

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. The tiny unit measures only 22.86 x 15.24mm including its Micro-USB connector. It offers several options for accessing the data, control, and GPIO pins on the CP2102N, all of which are made available on a 2.54mm spacing.

1317-002

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 5V systems that see 3.3V as a logic high. The green LED on the SUSPEND line indicates an active USB connection when lit.

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 CP2102N is a full-speed USB 2.0 device and allows baud rates of up to 3 Mbps. Drivers are available from Silicon Labs for Windows XP, Windows Vista, Windows 7, Windows 8, Windows 10, Linux, and Mac OS X.

Quick Spec

  • Chip: CP2102N
  • USB Standard: USB 2.0 (full speed)
  • Connector: USB Micro-B
  • Logic Voltage Level: 3.3V (5V tolerant)
  • Supported Baud Rates: 300 bps to 3 Mbps
  • Supply Current: 15 mA
  • Dimensions: 22.86 x 15.24mm
  • Net Weight: 4g

Dimensions

1317-005

Pinout

0-J10913-1200

   Pin       Type       Function   
   VDD    Power       3.3 V voltage regulator output
   VBUS    Power    USB bus voltage (5 V)
   GND    Power    Ground
   RST    In    Device reset
   TX    Out    Asynchronous serial data transmit (idle high)
   RX    In    Asynchronous serial data receive
   CTS    In    “Clear to send” control input
   (often used with RTS)
   RTS    Out    “Ready to send” control output
   (often used with CTS)
   DSR    In    "Data set ready" control input (active low)
   (often used with DTR)
   DTR    Out    "Data terminal ready" control output (active low)   
   (often used with DSR)
   DCD    In    "Data carrier detect" control input (active low)
   RI    In    "Ring indicator" control input (active low)
   SUSPEND       Out    Driven high when in USB suspend state
   SUSPEND    Out    Driven low when in USB suspend state
   (connected to green LED)
   GPIO.0    I/O    User-configurable inputs or outputs
   GPIO.1    I/O    User-configurable inputs or outputs
   GPIO.2    I/O    User-configurable inputs or outputs
   GPIO.3    I/O    User-configurable inputs or outputs


Using a different VIO

This carrier board connects the VIO pin of the CP2102N to VDD by default, setting its logic voltage level to the 3.3V provided by the IC’s built-in voltage regulator. 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. You can then solder a thin wire to the exposed via labeled “VIO” and connect it to a separate voltage supply (as low as 1.71V).

0-J10918-1200

Schematic

0-J10922-1200

Resources

Shipping List

1317-001
  • 1 x Pololu USB to Serial Adapter - CP2102N
  • 1 x Header Set


Pololu USB to Serial Adapter - CP2102N

  • Brand: Pololu Electronics
  • Product Code: 1317
  • Stock

    Warehouse Stock Status Location
    Centurion In Stock UL302
    Stellenbosch In Stock 931

    We ship free of charge between branches to complete your order.

  • R112.00 (Inc Tax: R128.80)


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Tags: pololu, usb, serial, adapter, usb to serial, cp2102n, cp210, 3.3v