High quality PCB Services https://pcbway.com You would think that implementing USB Type-C Power Delivery protocol on your upstream facing port is a difficult task and if I would ask you if you can also support Qualcomm quick charge on top of that, the issue is even more complicated and you would probably be right to think so if you wanted to implement all of this by yourself but luckily you don’t have to, because there are dedicated chips that can do all of this and in this video I’m gonna show you how to use them.

→Legendary LDR6321 UFP https://voltlog.com/y/01clm
→Legendary LDR6322 UFP https://voltlog.com/y/9kbdq
→App Note TI https://voltlog.com/y/2051h

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#PowerDelivery #LDR6321 #LDR6322

What I need is the ability to sink up to 3A with 5V or 12V selectable voltage levels into my board, so that fits under an Upstream Facing Port definition and I wasn’t going to start implementing the power delivery negotiation protocol, it’s just not worth the effort when there are chips, specifically designed to do that. After a bit of research I have identified a company named Legendary Technologies from Shenzhen, they seem to specialize in building these chips that provide USB Type-C negotiation for various roles. I have contacted them and I’ve been in touch with one of their applications engineers, they’ve been very supportive and have provided me with samples and support for implementing their chip which is very nice. I appreciate that kind of support and it helped me decide to use their chip in my design.

More specifically they have two chips that would cover my needs the LDR6321 and LDR6322, both of these chips can serve as an UFP with Power Delivery, QuickCharge and AFP protocol support. They support various versions of the protocols, PD 2.0 and 3.0, QC 2.0 and 3.0, the output voltage is configurable in fixed steps 5V, 9V, 12V, 15V and 20V.

There are two main differences between these chips. First is that the LDR6322 variant is capable of adjusting the voltage level dynamically after being plugged-in and powered on, the LDR6321 can only do it once when plugged-in and it first establishes negotiation. The second difference is that the LDR6321 cannot actively request 5V, if it's connected to an adapter supporting more than 5V, it will request 9V on its lowest setting. So that difference alone meant I had to use the LDR6322 which can actively select 5V, because I needed that level.