![Mike on Twitter: "USB-C question: I've seen others pull down CC1 & CC2 through a 5.1K resistor many times but the STM32 BlackPill appears to connect them to each other.? https://t.co/p3RjMr1Bvm" / Mike on Twitter: "USB-C question: I've seen others pull down CC1 & CC2 through a 5.1K resistor many times but the STM32 BlackPill appears to connect them to each other.? https://t.co/p3RjMr1Bvm" /](https://pbs.twimg.com/media/E9zwYWaXIAkEuMf.jpg)
Mike on Twitter: "USB-C question: I've seen others pull down CC1 & CC2 through a 5.1K resistor many times but the STM32 BlackPill appears to connect them to each other.? https://t.co/p3RjMr1Bvm" /
![How to design a proper USB-C™ power sink (hint, not the way Raspberry Pi 4 did it) | by Benson Leung | Medium How to design a proper USB-C™ power sink (hint, not the way Raspberry Pi 4 did it) | by Benson Leung | Medium](https://www.scorpia.co.uk/wp-content/uploads/2019/06/image-300x292.png)
How to design a proper USB-C™ power sink (hint, not the way Raspberry Pi 4 did it) | by Benson Leung | Medium
![Share about Firmware-Hardware and the latest USB Type-C PD technology. : USB Type-C Configuration Channel (CC) pin function (English version) Share about Firmware-Hardware and the latest USB Type-C PD technology. : USB Type-C Configuration Channel (CC) pin function (English version)](http://3.bp.blogspot.com/-3YFIjRmidYs/VBjjenmDkVI/AAAAAAAAAjQ/MI5j9l-3Ih4/s1600/Type_c_accessory_detection.jpg)