USB Type-C is a 24-pin reversible connector that supports power delivery, data transfer, and video output. Below is a pinout diagram and explanation of key pins.
1. USB Type-C Pinout Diagram
USB Type-C has two identical rows of 12 pins, making it reversible. The key functional groups are:
โโโโโโโโโโโโโโโโฌโโโโโโโโโโโโโโโ
โ A1 GND โ B12 GND โ
โ A2 TX1+ โ B11 TX2+ โ
โ A3 TX1- โ B10 TX2- โ
โ A4 VBUS โ B9 VBUS โ
โ A5 CC1 โ B8 SBU2 โ
โ A6 D+ โ B7 D+ โ
โ A7 D- โ B6 D- โ
โ A8 SBU1 โ B5 CC2 โ
โ A9 VBUS โ B4 VBUS โ
โ A10 RX2- โ B3 RX1- โ
โ A11 RX2+ โ B2 RX1+ โ
โ A12 GND โ B1 GND โ
โโโโโโโโโโโโโโโโดโโโโโโโโโโโโโโโ
2. Key Pins and Their Functions
| Pin | Function | Description |
|---|---|---|
| VBUS (A4, A9, B4, B9) | Power (5V to 20V) | Provides power to devices. |
| GND (A1, A12, B1, B12) | Ground | Common ground reference. |
| CC1 (A5), CC2 (B5) | Configuration Channel | Used for orientation detection and power negotiation. |
| D+ (A6, B7), D- (A7, B6) | USB 2.0 Data Lines | Standard USB 2.0 communication. |
| TX/RX (A2, A3, A10, A11, B2, B3, B10, B11) | High-Speed Data Transfer | Used for USB 3.0 and USB 3.1 communication. |
| SBU1 (A8), SBU2 (B8) | Sideband Use | Used for alternate modes (e.g., DisplayPort, Thunderbolt). |
3. USB Type-C Basic Wiring for Power
If you are using USB Type-C for power (5V output), connect:
- VBUS โ 5V
- GND โ GND
- CC1 or CC2 โ 5.1kฮฉ resistor to GND (for device detection)
โ ๏ธ Important:
- Without a 5.1kฮฉ pull-down resistor on CC1 or CC2, some devices may not power on.
- For USB Power Delivery (PD), you need an IC to negotiate higher voltages (e.g., 9V, 12V, 20V).
4. USB Type-C to USB 2.0 Wiring Example
To connect a USB Type-C plug to a USB 2.0 device:
USB Type-C โ USB 2.0
--------------------------
VBUS (A4, B4) โ 5V (Red)
GND (A1, B1) โ GND (Black)
D+ (A6, B7) โ D+ (Green)
D- (A7, B6) โ D- (White)
CC1 (A5) โ 5.1kฮฉ to GND
CC2 (B5) โ 5.1kฮฉ to GND
