Rockchip RK628D 24-in-1 Video Bridge Chip for Multi Display and Video Capture Applications

RK628D is Rockchip high performance 24-in-1 video bridge chip supporting HDMI, RGB and BT.1120 inputs, outputs include HDMI, GVI, MIPI CSI, dual LVDS, dual MIPI DSI, RGB and BT.1120. Supports up to 4K 60fps input output conversion with 1/4 to 4x scaling and dual channel simultaneous output at same resolution. Built in MCU enables standalone operation simplifying hardware design. Ideal for multi screen commercial display, smart projector, video capture card, docking station and wireless display

RK628D Core Features

Input Interfaces： HDMI 1.4/2.0 RX up to 4K60fps, parallel RGB up to 1080p60, 16 bit BT.1120 interface

Output Interfaces： HDMI TX, GVI, MIPI CSI, dual MIPI DSI, dual LVDS, parallel RGB and BT.1120 total 9 output types

Video Processing： Supports 1/4 to 4x scaling, color space conversion between RGB and YUV, up to 6x upscaling

Dual Channel Output： Supports simultaneous dual output at same resolution for multi display applications

Cascade Support： Multiple RK628D cascade for expanded video pathways

Built in MCU： Standalone operation without host processor simplifies system design

Temperature Range： Industrial grade minus 40 degrees Celsius to 125 degrees Celsius

Package Type： WBBGA-144 8 by 8 millimeters with 0.65 millimeter ball pitch

Audio Support： HDMI RX I2S interface up to 48kHz sampling rate supporting 8 channels

RK628D Applications

Multi Screen Commercial Display： HDMI input to MIPI or LVDS output for dual screen extended display

4K Large Screen Display： HDMI 4K input to GVI output for TV GVI screens and commercial bar displays

Smart Micro Projector： HDMI input to MIPI CSI output as video input source for main processor

Video Capture Card： HDMI input to MIPI CSI output for drone video transmission and live streaming capture

Wireless Display Dongle： Add display interface expansion via RK628D bridge

Docking Station： Single chip for multiple video interface conversion simplifying docking station design

Interactive Whiteboard： Supports various display interface conversion for large screen interactive applications

Smart Display： HDMI input to MIPI CSI providing video input for main processor

RK628D Key Advantages

24 in 1 Interface Combination： One chip replaces multiple dedicated bridge chips covering 24 conversion scenarios

4K Ultra HD Support： Up to 4K 60fps input output for high resolution large screen products

Standalone Operation： Built in MCU eliminates need for external host processor reducing cost and complexity

Software Compatibility： Based on DRM and FB display framework for easy replacement and mature ecosystem

Industrial Wide Temperature： Minus 40 to 125 degrees Celsius for industrial and outdoor applications

High Data Rate： Supports up to 3.75Gbps for high definition video transmission

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FAQ:

1. What is the Rockchip RK628D and its key specifications?
   The RK628D is a highly integrated 24‑in‑1 video interface bridge chip from Rockchip, designed for cost‑effective multi‑display applications. It supports a wide range of input and output interfaces: HDMI 1.4 (up to 4K@30Hz), MIPI DSI (4‑lane, up to 2K@60Hz), LVDS (single/dual‑link, up to 1920×1080@60Hz), and parallel RGB (up to 1080p@60Hz). The chip can perform protocol conversion between any of these interfaces. Key features include a hardware scaler, color space conversion, HDCP 1.4 decryption, and an integrated audio codec with I2S/SPDIF support. It is housed in a compact QFN‑68 package. The RK628D focuses purely on display bridging and does not support video capture (MIPI CSI output), making it an extremely affordable solution for digital signage, industrial HMIs, and embedded multi‑screen systems.

2. What input and output interfaces does the RK628D support, and what are the maximum resolutions?
   The RK628D provides HDMI 1.4 input and output up to 4K@30Hz. For embedded displays, it offers MIPI DSI (4‑lane, up to 2560×1600@60Hz with compression), LVDS (single‑link up to 1366×768@60Hz, dual‑link up to 1920×1080@60Hz), and parallel RGB (up to 1920×1080@60Hz). Audio can be routed via I2S or SPDIF or extracted from HDMI. This versatile set of interfaces covers the vast majority of embedded display panels and consumer monitor connections.

3. What types of protocol conversions can the RK628D perform?
   The RK628D can convert between any of its supported interfaces: HDMI‑to‑MIPI DSI, HDMI‑to‑LVDS, HDMI‑to‑RGB, MIPI DSI‑to‑HDMI, MIPI DSI‑to‑LVDS, MIPI DSI‑to‑RGB, LVDS‑to‑HDMI, LVDS‑to‑MIPI DSI, and the corresponding reverse paths. It supports HDCP 1.4 decryption for legally viewing protected HDMI content on non‑HDMI displays. The integrated scaler and color space converter ensure that the output timing and pixel format perfectly match the target panel. This single‑chip bridge eliminates the need for multiple discrete converters, drastically reducing BOM cost and PCB area.

4. Can the RK628D drive multiple displays simultaneously?
   Yes. The RK628D can drive two independent displays at the same time — for example, one HDMI output and one MIPI DSI panel. Each output can have different resolutions and timings thanks to the built‑in scaler and separate display paths. The two screens can show cloned content (identical) or extended content (different), making the chip ideal for dual‑display point‑of‑sale terminals, industrial HMI panels with a secondary monitor, and basic digital signage.

5. How does the RK628D differ from the RK628F and RK628H?
   The RK628D is the entry‑level member of the RK628 family. Compared to the RK628F, the RK628D lacks eDP 1.2 support and does not include a scaler as advanced as the RK628F's. Compared to the RK628H, the RK628D lacks HDMI 2.0 (4K@60Hz), eDP 1.4, and MIPI CSI video capture. The RK628D uses the same QFN‑68 package as the RK628F. Choose the RK628D when your design only requires HDMI, MIPI DSI, LVDS, or RGB bridging at 4K@30Hz or below, and you need the most cost‑optimised solution without eDP or video capture.

6. Does the RK628D support video capture?
   No. The RK628D is a display‑only bridge chip and does not feature a MIPI CSI output for video capture. It cannot convert an HDMI or other display input into a CSI stream for a host processor. If video capture is required, the RK628H should be used instead, as it provides HDMI‑to‑MIPI CSI and eDP‑to‑MIPI CSI conversion.

7. What audio capabilities does the RK628D offer?
   The RK628D includes an integrated audio codec capable of extracting audio from HDMI streams and accepting external I2S or SPDIF digital audio. Audio can be output via I2S, SPDIF, or re‑embedded into HDMI. This simplifies audio‑video synchronization in systems where the video is routed to a different connector than the audio, such as in digital signage or industrial terminals with separate speakers.

8. How is the RK628D controlled and configured?
   The chip is controlled through a standard I2C interface (default 7‑bit address 0x38 or 0x39, depending on a pin strapping). Rockchip provides a software SDK with APIs to set input/output modes, resolutions, HDCP keys, scaling, and audio routing. The RK628D can be initialized by an external MCU or directly by the host SoC. Ready‑to‑use Linux and Android drivers and reference schematics are included in the Rockchip SDK, significantly accelerating design‑in.

9. What are the power supply requirements and typical power consumption?
   The RK628D operates from 1.0 V (core), 1.8 V (MIPI/HDMI PHY), and 3.3 V (I/O and analog) supply rails. Typical total power consumption is under 1.2 W with dual displays active. The QFN‑68 package features an exposed thermal pad for heat dissipation, and no active cooling is required under normal ambient conditions. This low power makes the RK628D suitable for fanless, embedded, and battery‑powered multi‑display systems.

10. What are the most typical applications for the RK628D?
    The RK628D is widely used in low‑cost digital signage players, single‑board computers and developer kits, industrial HMI panels, portable monitors, point‑of‑sale (POS) terminals, and embedded kiosks. Its ability to bridge between HDMI, MIPI DSI, LVDS, and RGB, combined with dual‑display support and HDCP decryption, makes it an ideal companion for Rockchip SoCs such as RK3399, PX30, RK3326, and others that need flexible, low‑cost external display connectivity without the overhead of eDP or 4K60.