Project Description
The device is a USB to Dual HDMI converter. The device is used to connect two HDMI monitor to a PC over the USB. This system can be used in the USB Docking station.
Working
The device uses a Silicon Motion SM768 USB Display Docking Station SoC. SM768 USB display docking station graphic SoC enables multiple displays up to 4K ultra high definition through USB interface. Device can instantly mirror their computer screen to any external displays without the need to install a display driver. SM768 combine high graphics performance with low CPU loading and low power consumption. The CAT compression technology offers a high compression ratio while maintaining great image/video quality.
SM768 has a one direct HDMI Output Port. For the another HDMI port output, SM768 is interfaced with a HDMI transmitter IC (ITI66121FN). The transmitter IC converts the SM768 TTL data into HDMI data. A Nand Flash memory is used to store the SM768 firmware.
The device is connected to a host PC overt the USB3.0 interface.
Block Diagram
PCB Designing
The SM768 is a 425 pin BGA SoC. A 4 layer impedance controlled PCB is used for the device.
100 Ohm Impedance controlled differential pair tracks used for HDMI signals and 90 Ohm Impedance controlled differential pair tracks used for USB3.0 signals.
Specifications
- Two HDMI 1.4 Output
- Display Resolution
- 4K (3840x2160)@30Hz
- HD(1920x1080) & 2K @60Hz
- USB3.0 Micro B Connector
- Software Support
- Windows 7/8/10/11 & Servers, 32-bit, and 64-bit
- macOS X
- Linux OS(Ubuntu, RedHat, SUSE, etc)
- Android
- No Driver Required
- Custom Startup Logo
Schematic
Photo
4 Layer PCB
Top Side
