Item specifics
Description
RK628H is a highly integrated video interface bridge chip from Rockchip supporting HDMI 2.0, parallel RGB and BT.1120 inputs up to 4K 60fps input output. Output interfaces include dual MIPI DSI, dual MIPI CSI, dual LVDS, HDMI 1.4, parallel RGB and BT.1120 totaling 7 output types. Built in hardware scaler supports 1/4 to 6x video scaling with arbitrary non integer scaling for 4K input. Control interfaces include I2C I2S and UART with built in PLL and programmable resolution function. Package FBGA-144L 8 by 8 millimeters with triple voltage rails 1.71V to 1.89V, 3.135V to 3.465V and 0.99V to 1.21V. Ideal for expanding display output ports or adding HDMI input on RK3288 RK3399 RK3588 processors for multi screen commercial display smart projector video capture car infotainment industrial HMI and AI speaker applications.
RK628H Core Features
Input Interfaces： HDMI 2.0 RX up to 4K 60fps with HDCP 1.4/2.2 support, supports RGB/YUV444/YUV422/YUV420, CEC and EDID functions. Parallel RGB up to 1080p 60fps. 16 bit BT.1120 up to 1080p 60fps
Output Interfaces： Dual MIPI DSI up to 2560x1600 at 60fps, dual MIPI CSI up to 3840x2160 at 60fps, dual LVDS up to 1080p 60fps, HDMI 1.4 TX up to 1080p 60fps, parallel RGB and BT.1120 up to 1080p 60fps
Video Scaling： Built in hardware scaler supports up to 4K 60fps input with arbitrary non integer scaling ratio. Two scaling modes bilinear and average. Max 1/6 scaling down and 6x scaling up
Audio Support： 8 channel I2S audio interface, HDMI RX I2S up to 192kHz sampling rate, supports I/O I2S and HDMI TX I2S
Data Rate： HDMI input PHY up to 6Gbps per lane, MIPI output up to 3Gbps per lane, LVDS output up to 1Gbps per lane
Control Interfaces： I2C master interface, I2S digital audio interface, UART serial port, GPIO expansion pins
Supply Voltage： Triple voltage rails 1.71V to 1.89V, 3.135V to 3.465V and 0.99V to 1.21V
Phase Locked Loop： Built in PLL supports asynchronous output pixel clock with flexible display timing and configurable border black area
Package Type： FBGA-144L 8 by 8 millimeters with 0.65 millimeter ball pitch and 0.3 millimeter ball size
Key Features： Programmable resolution, built in PLL, HDMI RX/TX pass through, on chip readable writable EDID, left right split and odd even split modes
RK628H Applications
Multi Screen Commercial Display： HDMI input to MIPI DSI or LVDS output for dual screen expansion on RK3288 RK3399 RK3588 processors
Smart Micro Projector： HDMI input to MIPI CSI output as video input source for 4K projection display
Video Capture Card： HDMI input to MIPI CSI output for drone video transmission and live streaming capture devices
Car Infotainment System： HDMI input to dual LVDS output for driving in vehicle central console displays
Docking Station： Single chip for multiple video interface conversion simplifying docking station design
Industrial HMI： High performance video bridging for industrial equipment display requirements supporting 7 to 10 inch high definition screens
Smart Retail Terminal： High definition display output for self service kiosks and advertising displays
AI Smart Speaker： RGB to HDMI signal conversion providing video output capability for AI speakers
RK3588 RK3399 Companion： Expand display output ports or add HDMI input capability to application processors
RK628H Key Advantages
High Integration Multi Interface： Single chip integrates 3 input types and 7 output types covering complete video bridge conversion scenarios including HDMI MIPI LVDS RGB and BT.1120 formats
4K Ultra HD Support： Up to 4K 60fps input and dual MIPI CSI 4K 60fps output meets high resolution large screen product requirements
Arbitrary Non Integer Scaling： Built in high performance hardware scaler supports arbitrary non integer scaling for 4K input with up to 1/6x scaling down and 6x scaling up
Dual Display Capability： Supports dual MIPI DSI and dual LVDS simultaneous output with dual MIPI CSI 4K 60fps capture for multi screen applications
Integrated Digital Audio： 8 channel I2S audio interface up to 192kHz sampling rate with HDMI audio pass through for synchronized audio video transmission
Domestic Independent Supply Chain： Rockchip original design with long term supply commitment for industrial applications
Mature Ecosystem： Seamless integration with Rockchip processors widely adopted in various video conversion scenarios with complete technical support
Excellent Cost Performance： FBGA-144L compact package with unit price approximately 3.2to5.2 USD significantly reducing BOM cost
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FAQ:
What is the Rockchip RK628H and its key specifications?
The RK628H is a highly integrated video interface bridge chip from Rockchip, designed for multi‑display and video capture applications. It supports a wide range of input and output interfaces: HDMI 2.0 (up to 4K@60Hz), eDP 1.4 (up to 4K@60Hz), MIPI DSI (4‑lane), LVDS (single/dual‑link), and MIPI CSI for video capture. The chip can perform protocol conversion between any of these interfaces, making it extremely flexible. Key features include HDCP 1.4/2.2 encryption/decryption, scaling, color space conversion, and an integrated audio codec with I2S/SPDIF output. The device is housed in a QFN‑88 package and targets applications such as docking stations, digital signage, video conferencing, and embedded display systems.
What input and output interfaces does the RK628H support, and what are the maximum resolutions?
The RK628H features HDMI 2.0 input and output up to 4K@60Hz, eDP 1.4 input and output up to 4K@60Hz, MIPI DSI output (4‑lane, up to 2.5K@60Hz), LVDS output (single/dual‑link, up to 1080p@60Hz), and MIPI CSI input for video capture (up to 1080p@60Hz). It can also accept audio via I2S, SPDIF, or HDMI audio extraction. This broad interface coverage allows the RK628H to bridge almost any modern display source to any display panel, or capture high‑resolution video from HDMI/eDP sources into MIPI CSI for further processing.
What types of protocol conversions can the RK628H perform?
The RK628H can convert between any combination of its interfaces: HDMI‑to‑eDP, HDMI‑to‑MIPI DSI, HDMI‑to‑LVDS, eDP‑to‑HDMI, eDP‑to‑MIPI DSI, eDP‑to‑LVDS, and the reverse paths. It also supports HDMI‑to‑MIPI CSI and eDP‑to‑MIPI CSI for video capture, making it a universal bridge for both display and imaging pipelines. The chip handles HDCP decryption for protected content, allowing it to legally convert encrypted HDMI streams to other outputs. This flexibility significantly reduces system complexity by replacing multiple discrete bridge ICs with a single chip.
How does the RK628H support multi‑display configurations?
The RK628H can drive multiple displays simultaneously through its independent interface channels. For example, it can output to one HDMI display and one eDP or MIPI DSI panel at the same time, each with independent content (extended desktop) or cloned content. The chip includes a scaler and frame buffer that allow different resolutions and timings on each output. This makes it ideal for digital signage, point‑of‑sale terminals, and industrial HMI panels that require dual‑screen setups without a graphics card.
Can the RK628H capture video? What are its capture capabilities?
Yes, the RK628H supports video capture by converting HDMI 2.0 or eDP 1.4 input into a MIPI CSI output. The captured video can be up to 1080p@60Hz in standard mode, with support for higher resolutions when using multiple MIPI lanes. The capture path includes HDCP decryption, color space conversion, and optional down‑scaling, making it suitable for video conferencing cameras, game capture cards, and industrial vision systems where an external HDMI source needs to be ingested into a processor's MIPI CSI interface.
What audio capabilities does the RK628H offer?
The RK628H includes an integrated audio codec that can extract audio from HDMI streams, or accept external I2S or SPDIF audio inputs. It can output audio via I2S, SPDIF, or re‑embed it into HDMI/eDP outputs. This allows audio to be routed to external speakers, HDMI sinks, or back into a display stream, simplifying audio‑video synchronization in docking stations and media players.
How is the RK628H controlled and configured?
The chip is controlled via a standard I2C interface (default address 0x38 or 0x39, depending on pin strapping). Rockchip provides a software SDK and configuration tools that allow developers to set input/output modes, resolutions, HDCP keys, scaling, and audio routing through an easy‑to‑use API. The RK628H can be initialized by an external microcontroller or directly by the host SoC. For quick prototyping, many ready‑to‑use reference schematics and Linux/Android drivers are available in the Rockchip SDK, greatly accelerating time‑to‑market.
What are the power supply requirements and typical power consumption?
The RK628H operates from multiple supply rails: 1.0 V (core), 1.8 V (MIPI/HDMI PHY), 3.3 V (I/O and analog), and optionally 1.2 V for certain functions. Typical total power consumption depends on the active interfaces, but generally stays below 2 W even with 4K HDMI output and MIPI DSI active simultaneously. The QFN‑88 package features an exposed thermal pad for efficient heat dissipation, and no active cooling is required under normal operating conditions.
How does the RK628H compare to earlier Rockchip bridge chips like the RK628D?
The RK628H is a significant upgrade over the RK628D. The “H” variant adds HDMI 2.0 (4K@60Hz) support compared to the RK628D's HDMI 1.4 (4K@30Hz), includes eDP 1.4 (the RK628D only has eDP 1.2), and features a more powerful scaler and enhanced HDCP 2.2 decryption. The RK628H also supports HDMI‑to‑MIPI CSI video capture, which the RK628D does not. Both share the same QFN‑88 package, but the RK628H is recommended for new designs that require 4K60 performance, robust HDCP 2.2, and video capture.
What are the most typical applications for the RK628H?
The RK628H is widely used in USB‑C docking stations (to convert DisplayPort alt‑mode to HDMI/eDP), digital signage players, video conferencing cameras (capturing HDMI into MIPI CSI for SoCs), industrial HMI panels with dual displays, embedded vision systems, and portable monitors. Its ability to bridge virtually any display interface, combined with video capture and audio extraction, makes it a universal connectivity solution for both consumer and industrial multi‑display applications.