Item specifics
Description
RK628H Product Overview
The Rockchip RK628H accepts HDMI 2.0, parallel RGB, and BT.1120 as inputs. The HDMI receiver is compliant with HDMI 1.4/2.0, supports HDCP 1.4, reaches up to 4096×2160@60fps with 6Gbps PHY per lane, and supports RGB888, YUV444/422/420 at 8/10-bit depth. Outputs include dual MIPI DSI (up to 2560×1600@60fps), dual MIPI CSI (up to 3840×2160@60fps), dual LVDS (up to 1080p@60fps), HDMI 1.4 (up to 1080p@60fps), and RGB/BT.1120, flexibly adapting to mainstream interfaces from consumer electronics to industrial displays.
The chip integrates a Scaler supporting arbitrary non-integer scaling ratios, bilinear and averaging modes, with a maximum bilinear ratio of 1/4, adapting different input resolutions to target panels. It also features a built-in PLL and programmable resolution, with control interfaces including I2C, I2S, and UART. Its primary application is to expand display output ports or provide an HDMI input interface for processors like RK3288, RK3399, and RK3588. It is housed in an FBGA-144L (8×8mm) package, suitable for video capture, multi-screen signage, industrial HMI, and KVM switchers.
Specifications
| Brand | Rockchip |
| Model | RK628H |
| Device Type | Video Bridge Chip / Interface Converter IC |
| Input Interfaces | HDMI 1.4/2.0 (HDCP 1.4), Parallel RGB, BT.1120 |
| Output Interfaces | Dual MIPI DSI, Dual MIPI CSI, Dual LVDS, HDMI 1.4, RGB, BT.1120 |
| HDMI Input Resolution | Up to 4096×2160@60fps |
| Parallel RGB Input | Up to 1080p@60fps (24-bit) |
| Dual MIPI DSI Output | Up to 2560×1600@60fps |
| Dual MIPI CSI Output | Up to 3840×2160@60fps |
| Dual LVDS Output | Up to 1080p@60fps |
| HDMI Output | Up to 1080p@60fps |
| Data Rate | HDMI PHY 6 Gbps/lane; MIPI D-PHY 1.3 Gbps/lane; LVDS 1 Gbps |
| Scaling | Built-in Scaler, non-integer ratios (max bilinear 1/4) |
| Color Formats | RGB888, YUV444, YUV422, YUV420 (8/10-bit) |
| Audio Interface | 8-channel I2S |
| Control Interface | I2C, I2S, UART, GPIO |
| Supply Voltage | 0.99V~1.21V / 1.71V~1.89V / 3.135V~3.465V |
| Package | FBGA-144L (8 × 8 mm) |
Typical Applications
Adding HDMI input to SoCs: Enabling 4K HDMI reception for processors like RK3288, RK3399, and RK3588 without native HDMI IN
HDMI to MIPI CSI video capture: Converting 4K HDMI to MIPI CSI for capture cards, live streaming devices, KVM switchers, and embedded vision systems
Multi-screen signage & industrial HMI: HDMI IN → Dual MIPI DSI / Dual LVDS OUT for dual independent displays or high-resolution panels
HDMI audio extraction: Using the 8-channel I2S interface to extract HDMI embedded audio to an external DAC
4K large-screen conversion: 4K HDMI IN → 4K output (MIPI CSI or GVI) for commercial strip screens and TV panels
FAQ
Q: What is the difference between RK628H and RK628F?
A: Both largely overlap in core specifications, supporting HDMI 2.0 4K60 input, dual MIPI DSI/CSI output, and built-in scaling. The RK628H is a same-family model to the RK628F with essentially consistent interface combinations and feature sets; refer to Rockchip's latest official datasheet for specific differences. Selection can be based on supply availability and specific interface requirements.
Q: Can the RK628H directly replace the RK628D?
A: The RK628H is functionally an upgrade over the RK628D, with HDMI input improved from 4K30 to 4K60 and added dual MIPI support. However, hardware pinout and software drivers may differ; verify the FBGA-144L pin definitions and driver compatibility before direct substitution.
Q: What is the MIPI CSI output capability when converting HDMI?
A: The RK628H supports dual-channel MIPI CSI output up to 3840×2160@60fps with 1.3Gbps per lane. In practical implementations (e.g., Radxa adapter boards), 4-lane MIPI CSI supports 4K@30fps output. The CSI output format is YUV422.
Q: Does the chip support audio processing?
A: Yes. The RK628H features an 8-channel I2S audio interface for HDMI audio extraction and transmission, enabling synchronized audio-video capture or output.
Q: What are the typical application scenarios for the RK628H?
A: Primarily expanding HDMI input or display output for application processors, HDMI to MIPI CSI video capture (for capture cards, KVM, vision devices), multi-screen signage, and industrial HMI requiring interface conversion.
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