3 ms·
The USB-C spec has 24 pins, making it considerably more complex than USB-A connections, which 4 pins. Only 4 of those 24 pins are used for power delivery. If a
by markstos 4y ago
The USB-C spec has 24 pins, making it considerably more complex than USB-A connections, which 4 pins. Only 4 of those 24 pins are used for power delivery.
If all you need from the USB-C connection is charging, is OK to implement a 4 pin connection to keep the design simpler and cheaper?
- mmis1000 4y agoI think you also need the CC pin or you aren't going to have PD fast charging. The pin is required to handshake a higher Voltage and Current outside of standard 5C1A. And that literally exists. Most charge wire don't have full 24 line. (Unless it is specifically marked as USB3 compatible)
- danhor 4y agoFirst of all, 8 pins are used for power delivery for just VBUS & GND. Furthermore, you need the two CC pins or otherwise you won't get any voltage from USB-C chargers. USB 2.0 data pins are needed for backward compatible charging (otherwise a compliant device could only pull 500mA from a USB-A to C cable). The spec defines such a receptacle connector for USB 2.0-only support (also including the two sideband channels, but that's only 2 out of 16 pins, so probably not noticeably more expensive).