MS2131 USB 3.0 HD Audio/Video Capture Processor

The MacroSilicon MS2131 is a USB 3.0 HD video and audio acquisition and processing chip. It integrates a USB 3.0 Device controller, data transceiver, and audio/video processing blocks, allowing HD input audio/video to be previewed or captured on PCs, smartphones, and tablets over USB 3.0.

Compared with the entry MS2130, MS2131 adds HD loop-out, two I2S inputs, two I2S outputs, one SPDIF output, and audio mixing, making it suitable for USB capture devices that need local display loop-out and external digital-audio interfaces.

Key Capabilities

Item	Specification
USB interface	Integrated USB 3.0 Device, compatible with USB 2.0 Device mode
USB video protocol	UVC 1.0
USB audio protocol	UAC 1.0
Video input	HD RX, up to 4K (3840 × 2160 @ 30Hz)
Video loop-out	HD TX, supports HD RX to HD TX pass-through output
USB video output	YUV422, MJPEG
Default max USB output	1920 × 1080 @ 60Hz
Audio interfaces	2 I2S inputs, 2 I2S outputs, 1 SPDIF output
Audio processing	Default USB 48 kHz stereo output, I2S input audio mixed with HD audio
OS support	Windows XP/7/8/10/11, Android 5.0+, Linux, macOS
Package	LQFP-100, 14 mm × 14 mm

Block Diagram

The block diagram shows the MS2131 connection between HD RX input, HD TX loop-out, video/audio processing, UVC/UAC encoding, USB 3.0 Device, I2S/SPDIF audio interfaces, MCU, and SPI Flash.

HD RX Input and HD TX Loop-Out

• RGB444, YCbCr 4:2:2, YCbCr 4:4:4, and YCbCr 4:2:0 color spaces.
• Deep Color 24 / 30 / 36-bit modes.
• CEA-861-E and CEA-861-F video formats.
• Maximum HD input and output resolution: 4K (3840 × 2160 @ 30Hz).
• EDID / HPD processing.
• HD RX to HD TX pass-through output, enabling HD output playback while the USB Host records.

USB Capture Output

• Integrated USB 3.0 Device, compatible with USB 2.0 Device mode.
• USB video complies with UVC 1.0.
• USB audio complies with UAC 1.0.
• USB video output supports YUV422 and MJPEG modes.
• Default maximum USB video output resolution is 1920 × 1080 @ 60Hz.

Audio Features

• USB audio default 48 kHz stereo output.
• Two digital-audio I2S inputs.
• Two digital-audio I2S outputs.
• One SPDIF digital-audio output.
• Mixing of two I2S input audio streams with HD audio.

Clock, Reset, and Package

Item	Specification
External clock	External 24 MHz passive crystal
PLL	On-chip PLL
Reset	On-chip power-on reset
Package	LQFP-100, 14 mm × 14 mm

Typical Applications

• USB 3.0 HD capture cards with HD loop-out
• Live streaming, recording, and conferencing capture devices
• Capture devices requiring simultaneous local display and USB capture
• Audio/video capture modules requiring I2S / SPDIF digital-audio I/O
• Driverless UVC capture products for PCs, smartphones, and tablets

Design Notes

• MS2131 supports up to 3840 × 2160 @ 30Hz on HD input/loop-out, while the default maximum USB output is 1920 × 1080 @ 60Hz; these are different bandwidth levels.
• USB output formats are listed as YUV422 and MJPEG. Compare MS2130S / MS2131S if RGB24, NV12, or higher USB-side 4K output capability is required.
• When using HD loop-out, validate EDID, HPD, source format, and display compatibility.
• I2S / SPDIF and USB audio-mixing configurations should be validated with the target firmware, host UAC support, and audio sampling rate.
• Production designs should be based on the authorized MacroSilicon SDK, firmware, reference design, and board-level validation.

References

• MacroSilicon MS2131 public product page
• MacroSilicon MS2131 Chinese product page
• MacroSilicon model summary
• Video Capture series

Notes

This page summarizes information published on MacroSilicon's public Chinese and English MS2131 product pages. Confirm feature combinations, output formats, audio routing, OS compatibility, and production support against the latest authorized documentation and project validation results.