日: 2026年9月7日

Type-C CC Pin Configuration: D+/D-, Pull-Up/Down Resistor & Shorting Differences Explained

Hardware engineers frequently encounter a critical pitfall in Type-C CC pin configuration: confusing legacy USB-A protocols with native Type-C behavior. Many designers mistakenly treat D+/D- as the core charging channel. Consequently, circuits may show correct 5V polarity yet fail to charge, trigger device recognition errors, operate only on one insertion side, or exhibit current limiting—especially with Apple devices. In nearly all cases, the root cause is incorrect CC1/CC2 termination. Therefore, this guide clarifies standard 5V Type-C CC pin configuration so you can implement reliable charging circuits immediately. Core Principle: CC Pins Are the Sole Charging Channel In any Type-C CC pin configuration, all charging identification, current negotiation, plug orientation detection, and USB Power Delivery […]