HUSB280-Based Switch 2 Screen Mirroring Solution

When mirroring your Switch 2 to a TV, you'll often encounter issues like needing to connect the dock, being unable to fast charge, and even burning out the ports.

To address these pain points, Hynetek introduces its Switch 2 screen mirroring solution based on the PD DRP chip HUSB280. Through highly integrated design and full protocol compatibility, it delivers a convenient triple-in-one experience featuring plug-and-play functionality, fast charging, screen mirroring, and expansion capabilities.

HUSB280, as the core solution, is a PD DRP bidirectional fast charging protocol chip with integrated MOSFETs. It complies with the latest USB Type-C 2.4 and USB PD 3.2 protocol specifications, providing stable protocol interaction and power management support for Switch 2 screen mirroring scenarios. In hardware design, HUSB280 incorporates two built-in 30V-rated N-MOSFETs with a series on-resistance of just 21 mΩ. This eliminates the need for external MOSFET drivers, significantly simplifying customer system design and reducing PCB footprint. For protocol compatibility, firmware configuration supports multiple PDO and PPS modes to meet Switch 2's dynamic voltage regulation requirements. The integrated DPDM PHY supports mainstream fast-charging protocols including BC1.2, QC2.0/3.0/3+, AFC, FCP, SCP, and UFCS, while also being compatible with USB PD bidirectional communication. This enables both power delivery to Switch 2 and reverse power reception from connected devices. Furthermore, the chip is suitable for diverse applications such as power tools and battery-powered devices, further validating its stability and versatility.

The HUSB280-based Switch 2 screen mirroring solution features a clear and concise system architecture, designed to deliver a complete “one-cable connection” desktop experience for users. The typical application block diagram and usage method are as follows:

Figure 1: Typical Application Circuit Diagram for HUSB280

Figure 2: Usage of the HUSB280-Based Demo

1. Power Input: The solution requires a DC power input, with a recommended voltage around 20V (19V or 21V are also acceptable). This demo solution must be connected to a DC power source before it can begin operation.

2. Host Connection: Use a Type-C cable to connect Switch 2 to the Type-C port controlled by HUSB280. HUSB280's DRP feature enables intelligent power and role negotiation with Switch 2, establishing a stable PD connection and activating DisplayPort Alt Mode.

3. Video Output: Connect the solution's DP port to a large-screen monitor or TV to achieve 4K HD, low-latency game screen mirroring.

4. Peripheral Expansion: The solution's USB-A ports can connect to USB flash drives or portable hard drives for storage expansion, or to peripherals like mice, keyboards, and game controllers for data transfer and peripheral control, enhancing usability.

Figure 3: Successful Screen Mirroring to Switch 2 Using This Demo

The Switch 2 screen mirroring solution based on the HUSB280 offers multiple significant advantages in system design and final performance:

1. High integration and high voltage withstand design: The chip integrates two N-MOSFETs and drive circuits, eliminating the need for external components. Its 30V voltage withstand capability eliminates the need for external CC/SBU OVP, effectively resisting voltage surges during insertion/removal and reducing the risk of Switch 2 interface damage.

2. Flexible Design and Component Freedom: No restrictions on peripheral DC-DC converter selection. The solution imposes no special requirements on downstream DC-DC buck converters, allowing use of common FB-controlled DC-DCs. This provides hardware engineers extensive component freedom, facilitating utilization of existing mature solutions or cost optimization.

3. Robust Expansion Capabilities: Supports external USB 2.0 MUX with Billboard functionality (via HUB), while enabling TX/RX channels to operate alongside platform-integrated or external USB 3.0 MUX. This dual-mode architecture accommodates both screen mirroring and peripheral expansion.

4. Mature and Stable Firmware Support: The HUSB280 incorporates comprehensive protocol processing firmware, compatible with Switch 2 and mainstream DRP devices like smartphones, tablets, and laptops. Future protocols and devices can be supported through firmware updates.

5. Refined Protection Mechanisms: Integrated current sensing and external N-MOS control logic enable multiple protections including overcurrent and overvoltage, ensuring safe operation for both Switch 2 and connected devices.

As the era of full-featured Type-C for portable devices like the upcoming Switch 2 approaches, the HUSB280 PD DRP chip from Hynetek delivers the perfect core driving force for building next-generation high-performance, highly reliable screen mirroring docks. Its high integration, robust protocol compatibility, flexible design solutions, and reliable performance make it the ideal choice. Choosing a solution based on the HUSB280 means selecting not just a chip, but a market-proven, future-oriented, mature technology platform capable of rapid time-to-market.