Recently, the dual-port DRP USB PD Controller LDR6282 launched by Ledary Technology has successfully passed the PD3.0 certification of USB-IF, TID: 2127. The LDR6282 chip has dual-C port DRP and USB PD3.0 control functions, and is widely used in USB-C docking, USB-C displays, USB-C mobile audio adapters, embedded Android/linux systems and other occasions. It supports standard USB Based on the PD3.0/QC2.0/QC3.0 protocol, it is specially adapted to the video extension function of the Nintendo game console Switch, and the compatibility is very good.
The chip has a built-in 64K flash that can be connected to the cloud to upgrade the internal firmware. So that complex product design can also be peace of mind, even if the product has been delivered to the end consumer, the firmware can still be upgraded through the mobile phone APP or PC application. Typical applications of this chip include the following scenarios.
1.
The dual DRP and USB PD3.0 functions of the portable USB-C monitor LDR6282 enable those monitors with dual C ports to have the function of blind plugging in two C ports and support Nintendo Switch game console video expansion. The user does not have to distinguish which one is the charging port and which one is the smart device. LDR6282 will parse according to the USB PD protocol and automatically allocate the connection relationship between the two C ports. Just like the smart adaptation of Macbook Pro to multiple C ports. Using LDR6282+RTD2556/2795 can easily design a smart display with USB-C interface. The original factory of Lederui can provide detailed design reference circuit diagrams and help customers achieve mass production.
2. Power distribution of USB-C Docking
Since the introduction of USB-C docking products, power distribution has become a very important intelligent option. If Docking reserves too much power for peripherals, then the power to charge the computer will be very low, or even unable to charge the computer. For example, Xiaomi’s notebook computer requires the charging parameter to reach 20V@2A or more to start the battery Recharge. On the contrary, if the power is mainly used to charge the computer, the power reserved for the peripherals may not be enough, causing the docking port to connect to the mechanical hard disk, or when charging the mobile phone, the docking restarts. In order to solve this contradiction, LDR6282 provides an APP intelligent configuration function, users can allocate power in real time according to their own usage conditions to achieve the best use effect.
3. USB-C interface audio adapter function
In addition to being compatible with the standard USB PD3.0 protocol, the LDR6282 is also compatible with existing mobile phones and other devices on the market. As the year of the widespread popularity of USB PD on mobile phones in 2019, we discovered a series of compatibility issues with the USB-C interface design of many brand mobile phones. LDR6282 has been specifically designed to ensure that all models of mobile phones on the market can be equipped with adapters, high-fidelity audio effects and USB PD fast charging functions, which are perfectly realized.
Compatibility issues of mobile phones, I will write a separate article for details. The first bug is about Google Pixel3 mobile phones. Under normal circumstances, the charging current can reach 9V/1.6A or more, but once the PR_SWAP operation is performed, the charging current will only be 9V/0.3A, this is a bug in the design of mobile phone power management system. Google, as a pioneer in the advancement of the USB PD protocol, has such a bug in the design of mobile phones. It can be seen that Google's own hardware product design level is indeed relatively average. In order to adapt to this bug, LDR6282 performs a special operation for the mobile phone when PR_SWAP is required, which can perfectly realize the compatibility of fast charging and high-fidelity audio output.
The second bug is about the Black Shark phone 1. This phone has a weird bug. It does not support video output through the USB-C port, but it will pretend to support it in the protocol, and the game is too deep. Once you enter it In the video output mode, the phone will fall into a black screen, and the phone must be forcibly restarted to recover.
If LDR6282 recognizes the Black Shark 1 mobile phone, it will automatically stop the DP ALT MODE negotiation process. The third bug is about the USB2.0 function of Huawei P20 mobile phone. In the USB PD protocol, the DR_SWAP function is generally used to switch the host and device roles of the USB data. After the mobile phone receives the DR_SWAP command, it needs to reconfigure and enumerate the USB2.0 bus. However, P20 did not do so. After causing DR_SWAP, peripherals cannot be connected to the USB2.0 bus.
In order to solve this problem, LDR6282 has also carried out compatibility adaptation, so that the usb2.0 peripheral can be initialized at the right time. There are many problems of this kind. In order to provide first-class user experience, LDR6282 has uniquely designed more compatible designs on the basis of supporting standard PD3.0 protocol certification. Just as we launched the world's first compatible Nintendo game console for video expansion in 2017, LDR6282 is currently the most compatible USB PD controller on the market.
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Figure 5 LDR6282 can be used for embedded intelligent system development.
Raspberry Pi is an embedded system that is widely loved by developers. With the popularization of USB-C interface, the development of all robots, drones, and AI systems must also be used The USB-C interface management chip, the I2C and UART interface control chip of the LDR6282, provide an ideal USB-C interface management chip for the development of intelligent embedded systems.
The Android system can easily communicate with the LDR6282 through the i2C interface, obtain interface status information, and control the specific behavior of the USB-C interface, such as obtaining the power adapter or mobile phone/PC currently plugged into the C port, and deciding whether to pull it from the inserted device Taking power, or powering the plug-in device, and other strategies, you can also perform high-definition audio and video transmission control. It can be said that LDR6282 is an ideal USB-C interface control chip in the intelligent embedded development process.
The replacement of the traditional USB-A/B interface by the USB-C interface is in full swing. The unavoidable problem is the compatibility of the USB PD protocol. How to be compatible with QC protocol? How to be compatible with the custom protocol of the host manufacturer? How to be compatible with the bugs in the design process of the host manufacturer? It is a headache for many USB-C related product design engineers.
LDR6282 allows you to sit back and relax in the USB-C interface product design process. In addition, in order to allow engineers to use the USB PD protocol more flexibly, Le Drey will also launch a USB PD control chip with UART and I2C interface communication functions. LDR6380 (UFP)/LDR6280 (DRP) can bring more convenient applications for engineers.