01 Main content
The USB-IF organization issued an announcement announcing the revision of the USB PD protocol 3.1 specification to increase the maximum power of USB Type-C from 100W (20V, 5A) to 240W (48V, 5A).
At the same time, the USB Type-C specification has also been updated to version 2.1 to define the requirements for 240W cables to meet the application needs of higher charging power.
02 About USB PD fast charging protocol
There are many fast charging protocols, among which USB-Power Delivery (USB PD) is one of the most widely used fast charging protocols. This protocol is a fast charging specification formulated by the USB-IF organization.
With the changes in market demand, the charging power requirements are getting larger and larger, and you can see the power change from the charging power of the mobile phone. Then there are several versions of fast charging protocols such as QC1.0, QC2.0, QC3.0, and QC4.0.
The principle of USB PD fast charging communication is actually not difficult. Readers who do this should have some understanding. Compared with TCP/IP, the principle of communication is much simpler.
03 Contents of the new USB PD protocol
The new USB PD protocol specifies a more stringent charging protocol, especially for products with a power in the range of 100 ~ 240W (relatively lower power).
New features of USB PD protocol 3.1 specification:
1. Three new fixed voltages are added: 28V voltage for over 100W; 36V voltage for over 140W and 48V for over 180W
Add the previously defined 5V, 9V, 15V, 20V fixed voltages.
2. A new adjustable voltage mode allows powered devices to request specific voltages to 100mV resolution from 15V to one of three maximum voltages (28V, 36V or 48V) based on available power.
04 Additional Content
1. About USB Promotion Organization
The USB advocacy group consists of Apple, Hewlett-Packard, Intel, Microsoft, Renesas Electronics, STMicroelectronics, and Texas Instruments.
The organization will continue to develop the USB family of specifications to meet market demand for increased functionality and performance of USB solutions.
In addition, the USB Promotion Group develops specification appendices (USB Power Delivery, USB Type-C, etc.) to expand or adjust its specifications to support more platform types or use cases, and the adoption of USB technology will help provide more general and richer user experience.
USB Type-C® and USB-C® are registered trademarks of the USB Forum.