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.
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
Pinout
| 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).
Schematic
Resources
- Product Page
- CP2102N Datasheet
- Mechanical Diagram
- CP210x USB-to-UART Bridge Drivers
- Silicon Labs CP2102N USBXpress USB Bridge Product Page
Shipping List
- 1 x Pololu USB to Serial Adapter - CP2102N
- 1 x Header Set
Pololu USB to Serial Adapter - CP2102N
- Brand: Pololu Electronics
- Product Code: 1317
- Weight: 0.004kg
- Product Status : Active
Stock
| Warehouse | Stock Status | Location |
|---|---|---|
| Centurion | No Stock | |
| Stellenbosch | No Stock |
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