Radxa 4K HDMI IN to MIPI CSI-2 Adapter
Introduction
The Radxa 4K HDMI IN to MIPI CSI-2 Adapter is based on the Rockchip RK628H video bridge chip. It converts HDMI video signals into MIPI CSI-2 signals and extracts I2S digital audio from the HDMI signal.
The adapter provides both 2-lane and 4-lane MIPI CSI-2 connectors, allowing development boards to quickly interface with HDMI cameras, computers and other high-definition video sources. It is suitable for video capture, image processing and embedded vision applications.
Features
- 4K HDMI input
Supports HDMI video input up to 4K@30fps, meeting high-definition video capture requirements.
- MIPI CSI-2 output
Provides 2-lane and 4-lane MIPI CSI-2 connectors: the 4-lane connector supports video output up to 4K@30fps, and the 2-lane connector supports video output up to 2K@30fps (2560 x 1440).
- RK628H video bridge
Based on the Rockchip RK628H, it converts HDMI signals into MIPI CSI-2 video signals.
- HDMI audio extraction
Extracts audio from the HDMI input signal and outputs digital audio through a dedicated I2S connector.
- EDID management
Declares supported video formats to the HDMI source through EDID, improving compatibility with different HDMI sources.
- Compatible with Radxa Z form factor
It can be mounted directly on Radxa Z form factor mini boards. For other form factors, the extension part can be cut along the reserved break line to fit different installation spaces.
- Built for vision development
Suitable for HDMI video capture, image processing, video analysis and embedded vision applications.
Specifications
| Item | Specification |
|---|---|
| Processor | Rockchip RK628H |
| Video input | HDMI input, up to 4K@30fps |
| Video output | 1x 2-lane MIPI CSI (15-Pin, 1.0 mm pitch), up to 2K@30fps (2560 x 1440); 1x 4-lane MIPI CSI (31-Pin, 0.3 mm pitch), up to 4K@30fps; up to 1.3 Gbps per lane |
| Audio output | I2S digital audio output; pins: DOUT, LRCK, SCLK, MCLK |
| Auxiliary signal | HDMI detection and system interrupt; signals: DET, INT |
| Dimensions | 30 x 65 mm |
| Compatible with | ROCK 3C / ROCK 4D / ROCK 5A / ROCK 5B / ROCK 5B+ / ROCK 5C / ROCK 5T |
Mechanical dimensions
Pinout
The adapter provides three connectors: 31-Pin MIPI CSI (4-lane), 15-Pin MIPI CSI (2-lane) and a 7-Pin header (I2S).
31-Pin MIPI CSI (4-lane)
| Pin | Signal | Level | Description |
|---|---|---|---|
| 1 | GND | - | Ground |
| 2 | MIPI_D3N | - | Data lane 3 negative |
| 3 | MIPI_D3P | - | Data lane 3 positive |
| 4 | GND | - | Ground |
| 5 | MIPI_D2N | - | Data lane 2 negative |
| 6 | MIPI_D2P | - | Data lane 2 positive |
| 7 | GND | - | Ground |
| 8 | NC | - | Not connected |
| 9 | NC | - | Not connected |
| 10 | GND | - | Ground |
| 11 | MIPI_D1N | - | Data lane 1 negative |
| 12 | MIPI_D1P | - | Data lane 1 positive |
| 13 | GND | - | Ground |
| 14 | MIPI_D0N | - | Data lane 0 negative |
| 15 | MIPI_D0P | - | Data lane 0 positive |
| 16 | GND | - | Ground |
| 17 | MIPI_CLKN | - | MIPI CSI clock negative |
| 18 | MIPI_CLKP | - | MIPI CSI clock positive |
| 19 | GND | - | Ground |
| 20 | NC | - | Not connected |
| 21 | GND | - | Ground |
| 22 | NC | - | Not connected |
| 23 | RK628_INT | 1.8V | RK628 interrupt output |
| 24 | I2C_SCL | 1.8V | I2C clock |
| 25 | I2C_SDA | 1.8V | I2C data |
| 26 | RK628_Plugin_DET | 1.8V | Adapter presence detect |
| 27 | RK628_Reset | 1.8V | RK628 reset |
| 28 | 3.3V | 3.3V | Power |
| 29 | 3.3V | 3.3V | Power |
| 30 | 5V | 5V | Not used |
| 31 | 5V | 5V | Not used |
15-Pin MIPI CSI (2-lane)
| Pin | Signal | Level | Description |
|---|---|---|---|
| 1 | 3.3V | 3.3V | Power |
| 2 | I2C_SDA | 3.3V | I2C data |
| 3 | I2C_SCL | 3.3V | I2C clock |
| 4 | NC | - | Not connected |
| 5 | RK628_Reset | 3.3V | RK628 reset |
| 6 | GND | - | Ground |
| 7 | MIPI_CLKP | - | MIPI CSI clock positive |
| 8 | MIPI_CLKN | - | MIPI CSI clock negative |
| 9 | GND | - | Ground |
| 10 | MIPI_D1P | - | Data lane 1 positive |
| 11 | MIPI_D1N | - | Data lane 1 negative |
| 12 | GND | - | Ground |
| 13 | MIPI_D0P | - | Data lane 0 positive |
| 14 | MIPI_D0N | - | Data lane 0 negative |
| 15 | GND | - | Ground |
7-Pin header
| Pin | Signal | Level | Description |
|---|---|---|---|
| 1 | I2S_D0 | - | I2S data output (DOUT) |
| 2 | I2S_LRCK | - | I2S frame clock (LRCK) |
| 3 | I2S_SCLK | - | I2S bit clock (SCLK) |
| 4 | I2S_MCLK | - | I2S master clock (MCLK) |
| 5 | RK628_Plugin_DET | 3.3V | Adapter presence detect |
| 6 | RK628_INT | 3.3V | RK628 interrupt output |
| 7 | GND | - | Ground |
- The 31-Pin connector carries MIPI CSI video only. HDMI audio must be wired separately from the I2S pins on the 7-Pin header.
RK628_Plugin_DETandRK628_INTare 1.8V on the 31-Pin connector but 3.3V on the 7-Pin header, so check level compatibility when wiring.- Pins marked
NCare not connected; leave them floating and do not short them to other signals.
Package contents
- 1x Radxa 4K HDMI IN to MIPI CSI-2 Adapter
- 1x AC006 (31P 0.3 mm to 31P 0.3 mm, opposite side FPC cable)
- 1x AC014 (15P 1.0 mm to 15P 1.0 mm, opposite side FPC cable)