Let me add a few words.

The changes in PD3.0 compared to PD2.0 are mainly in three aspects:

First, a more detailed description of the characteristics of the built-in battery of the device is added.

Second, the function of device software and hardware version identification and software update through PD communication has been added.

Third, the digital certificate and digital signature functions are added.

The first change allows both parties to have a clearer understanding of the power supply status of the other party, thereby coordinating the power supply strategies of both parties. It is extremely important to use the USB PD protocol to build a low-voltage smart power supply network. Power supply topologies can be coordinated under various power conditions. For example, emergency power supply processing strategies when the grid is out of power, power supply strategies for coordinating grid power supply and household solar power generation devices, reverse power supply strategies to the grid, etc. It can make Power more SMART.

The second software upgrade function can make the compatibility of the device even better. All TYPE-C manufacturers can publish their latest firmware versions to the Internet, so that they can be used through PC As well as mobile phones, etc., non-networked peripheral accessories have been updated in a timely manner. Just like Microsoft's win10 system can solve hardware driver problems online in real time. The internal firmware of the USB PD device has also become part of the traditional hardware driver resources.

The third digital certificate function is probably the most important function of this upgrade. All TYPE-C products must obtain a digital certificate issued by the USB-IF organization using a private key to operate smoothly. Products without certificates may not be accepted by TYPE-C products from other manufacturers. This function has a very positive significance. It can prevent unqualified TYPE-C interface equipment from harming normal equipment due to quality problems. In enterprise information security applications, the enterprise itself can also issue security certificates to prevent non-enterprise internal USB devices from accessing. This will be more secure than the existing USB encryption technology, because before the security authentication is completed through the CC line, Storage media and systems are physically isolated.

I don’t think we need to pay too much attention to these upgrades. First of all, from a protocol perspective, PD2.0 is a subset of PD3.0, that is to say, PD3.0 is naturally compatible with PD2.0. Secondly, from a hardware perspective, the link layer and physical layer of PD3.0 and PD2.0 are fully compatible. In other words, when upgrading the product, no hardware changes are required, only online software upgrades are required. Therefore, whether from the perspective of the protocol itself or from the perspective of market strategy, we can actively develop USB PD 2.0 products. When necessary, just upgrade the firmware part to be compatible with PD3.0.