How to Use USB-C Breakout: Examples, Pinouts, and Specs

The USB-C Breakout by Cermant is a compact and versatile breakout board designed to provide easy access to the pins of a USB-C connector. This component simplifies prototyping and testing of USB-C connections, enabling developers to integrate USB-C functionality into their projects without the need for complex soldering or custom PCBs.

• Prototyping USB-C power delivery (PD) circuits
• Testing USB-C data transfer capabilities
• Developing USB-C-based devices, such as chargers, hubs, or peripherals
• Educational purposes for learning USB-C pinout and functionality

The USB-C Breakout board by Cermant is designed to meet the needs of developers working with USB-C technology. Below are the key technical details:

The USB-C connector has 24 pins, but the breakout board exposes only the most commonly used pins for prototyping. Below is the pin configuration:

Note: Not all pins are exposed on the breakout board. Refer to the manufacturer's datasheet for the full USB-C pinout.

1. Connect the Breakout Board to a Breadboard:

   • The breakout board is designed to be breadboard-compatible. Insert the pins into the breadboard for easy prototyping.

2. Power the Board:

   • Connect the VBUS pin to your power source (5V to 20V, depending on your application).
   • Ensure the GND pin is connected to the ground of your circuit.

3. Use the CC Pins for Configuration:

   • The CC1 and CC2 pins are used to detect the orientation of the USB-C cable and negotiate power delivery. Use appropriate resistors (typically 5.1kΩ) to configure the desired power profile.

4. Connect Data Lines:

   • Use the D+ and D- pins for USB 2.0 communication.
   • For USB 3.1 SuperSpeed communication, connect the TX and RX pins as needed.

5. Test Your Circuit:

   • Verify all connections before powering the circuit. Use a multimeter to check for shorts or incorrect wiring.

• Voltage and Current Ratings: Ensure that the power source and connected devices do not exceed the breakout board's voltage and current ratings.
• Cable Orientation: USB-C cables are reversible. Use the CC pins to detect the cable orientation and configure the circuit accordingly.
• Data Protocols: If using USB 3.1, ensure that your circuit supports the required SuperSpeed data rates.
• ESD Protection: Consider adding external ESD protection components to safeguard the breakout board and connected devices.

Below is an example of using the USB-C breakout to power an Arduino UNO and read data from a USB-C device:

// Example: Reading data from a USB-C device using Arduino UNO
// Ensure the USB-C breakout is connected to the Arduino as follows:
// VBUS -> 5V, GND -> GND, D+ -> Pin 2, D- -> Pin 3

#include <SoftwareSerial.h>

// Define pins for USB-C data lines
#define USB_DPLUS 2
#define USB_DMINUS 3

// Initialize SoftwareSerial for USB-C communication
SoftwareSerial usbSerial(USB_DPLUS, USB_DMINUS);

void setup() {
  // Start serial communication
  Serial.begin(9600);
  usbSerial.begin(9600);

  // Print a message to indicate setup is complete
  Serial.println("USB-C Breakout Example: Ready to receive data.");
}

void loop() {
  // Check if data is available from the USB-C device
  if (usbSerial.available()) {
    // Read data from the USB-C device
    char data = usbSerial.read();

    // Print the received data to the Serial Monitor
    Serial.print("Received: ");
    Serial.println(data);
  }
}

Note: This example assumes the USB-C device communicates using USB 2.0 protocols. For USB 3.1 or Power Delivery, additional hardware and libraries may be required.

1. No Power on VBUS Pin:

   • Cause: The USB-C cable may not be properly connected, or the power source may not be active.
   • Solution: Check the cable connection and ensure the power source is functioning.

2. Incorrect Voltage on VBUS:

   • Cause: The CC pins are not configured correctly for power delivery.
   • Solution: Use appropriate resistors (e.g., 5.1kΩ) on the CC pins to negotiate the desired voltage.

3. Data Communication Fails:

   • Cause: Incorrect wiring of D+ and D- pins or unsupported protocol.
   • Solution: Verify the connections and ensure the device supports the desired USB protocol.

4. Overheating:

   • Cause: Excessive current draw or short circuit.
   • Solution: Check the circuit for shorts and ensure the current does not exceed 5A.

Q: Can this breakout board be used for USB Power Delivery (PD)?
A: Yes, the breakout board supports USB PD, but you must configure the CC pins with appropriate resistors to negotiate the desired voltage and current.

Q: Does the board support USB 3.1 SuperSpeed?
A: Yes, the breakout exposes the TX and RX pins required for USB 3.1 SuperSpeed communication.

Q: Is the breakout board compatible with all USB-C cables?
A: The board is compatible with standard USB-C cables, but ensure the cable supports the required power and data specifications for your application.