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VL822 USB 3.1 Gen2 Hub Controller

Description


 
VIA Lab’s VL822 is USB 3.1 Gen 2 Hub Controller and it features highly integrated, application specific design. VL822 features 1x upstream port and 4x/2x downstream ports, all of which support 10Gbps USB 3.1 Gen 2 operation. The downstream ports can support any combination of SuperSpeed Plus (10Gbps), SuperSpeed (5Gbps), High Speed (480Mbps), Full Speed (12Mbps), and Low Speed (1.5Mbps) devices. VL822’s integrated USB 2.0 hub features Multiple Transaction Translators, providing increased bandwidth and performance when multiple Full Speed devices are simultaneously used.

VL822 comes in three variants: VL822-Q8 utilizes the QFN88 10x10x0.85 mm package while the VL822-Q7 utilizes the smaller QFN76 9x9x0.85mm package and VL822-Q5 utilizes the smaller QFN56 7x7x0.85mm package for two port configure. The larger QFN88 variant features integrated 10Gbps Muxes for the Upstream Facing Port and two Downstream Facings Ports whereas the smaller QFN76/QFN56 variant does not. The integrated 10Gbps Muxes are ideal for Data-Only USB-C applications that would otherwise require an external Mux, with the advantage of potential board area savings and improved signal integrity. If additional USB-C Ports are need, separate CC Logic and Mux solutions.

VL822 features an optionally configurable USB Billboard Device when used in USB-PD Alternate Mode applications, and an optionally configurable USB HID endpoint to support Media Control Buttons such as Play/Pause, Volume Up/Down, etc.

VL822 features flexible firmware architecture, providing a framework for custom functions in addition to in-field updates. Various parameters including USB configuration, Tx equalization setting, and GPIO behavior are changeable via firmware. VL822 also features an optionally configurable USB Charging Controller for charging various devices such as smartphones and tablets that can be configure on a per-port basis.

VL822-based hub devices work under Windows, Mac OS X, and various Linux kernels without additional drivers. VL822-based hub devices are also compatible with non-x86 devices and platforms that support USB hub functions such as smart phones, tablets, and set-top boxes. It is well suited for all USB hub applications such as standalone USB hubs, Notebook/Ultrabook docking stations/port-replicators, desktop PC front panel, motherboard on-board hub, and USB hub compound devices.

Block Diagram

Key Features

  • USB 3.1 Compliant
    - Compliant to Universal Serial Bus 3.1 Specification
    - SuperSpeed Plus USB (USB 3.1 Gen 2)
    - Compliant to Universal Serial Bus 2.0 Specification
    - USB 2.0 Hub Supports MTT
    - Supports Simultaneous Operation of Any Combination of SuperSpeed Plus, SuperSpeed, High-Speed, Full-Speed, and Low-Speed Devices
    - Supports USB Power Saving Features such as Link Power Management, Ux States, Selective Suspend, and Function Suspend
    - In-house USB PHY employs advanced CMOS process for low power consumption

  • USB Type-C 1.0 Rev 1.2 Compliant
    - Compliant to USB Type-C Specification Rev 1.3
    - VL822-Q8: Integrated 10Gbps Mux for UFP and 2x DFP
    - Requires External CC Logic Controller for Orientation Detection/Vconn (Such as VP246 or VP225)
    - Additional USB-C DFP support requires separate CC Logic and Mux

  • Integrated USB Devices
    - USB Billboard Class 1.21 Device
    Implemented as a USB 2.0 Virtual Device
    Configurable Behavior -Expose When Necessary / Always Present / Disabled
    - USB HID Class Device
    Implemented as a USB 2.0 Virtual Device, Facilitates FW Update or Media Control Buttons
    Configurable Behavior -Always Present / Disabled
  • Full Sideband Signal Support
    - Supports Any Combination of Individual or Ganged Mode Over-Current for All Ports
    - Supports PWM LED Status Lights
    - SPI Interface for Firmware.
    - Firmware Upgradable over USB

  • Comprehensive USB Battery Charging Support
    - Supports USB Battery Charging Specification v1.2 (SDP, CDP, DCP)
    - Support for Vendor Specific Charging Modes eg. Apple 2.4A, Samsung, etc.
    - Supports YD/T 1591-2009
    - Supports Stand-Alone Charging when System is Suspend, Shut Down, or Disconnected
    - Any Combination of DFPs can be Configured to Support USB Battery Charging

  • Power and Package
    - Requires 3.3V and 1.05V Inputs
    - VL822-Q8: QFN 88L green package (10x10x0.85 mm)
    - VL822-Q7: QFN 76L green package (9x9x0.85 mm)
    - VL822-Q5: QFN 56L green package (7x7x0.85 mm)
    - Pin Compatibility with VL820 / VL819
    - 25MHz Xtal