MAIX-II A AI camera board combines Allwinner R329 smart audio processor with USB-C camera

Earlier this year, we wrote about  Sipeed MAIX-II Dock AIoT vision devkit with an Allwinner V831 camera processor with a small 200 MOPS NPU, an Omnivision SP2305 2MP camera sensor, and a 1.3-inch display.

But for some reason, which could be supply issues, Sipeed has designed a much different variant called MAIX-II A with a board based on Allwinner R329 smart audio processor, a 720p30 USB camera module, and a 1.5-inch display.

MAIX-II A R329 processor USB camera

MAIX-II A board specifications:

  • Main M.2 module – Maix-II A module with Allwinner R329 dual-core Cortex-A53 processor @ 1.5 GHz, 256MB DDR3 on-chip, a dual-core HIFI4 DSP @ 400 MHz, and Arm China AIPU AI accelerator for up to 256 MOPS, plus Wi-Fi & BLE and a footprint for an SPI Flash.
  • Storage – MicroSD card socket
  • Display – 1.5-inch LCD display with 240×240 resolution
  • Audio – Dual microphones, 3W speakers
  • Camera – 720p USB-C camera module based on OV9732 sensor
  • Video – H.264/H.265/JPEG 720p30 hardware video encoder
  • Connectivity
    • Realtek RTL8723DS for WiFI 4 and Bluetooth LE On M.2 module
    • 24-pin FPC connector on M.2 module for Gigabit Ethernet
  • USB – 2x USB-C ports one OTG port, and for debugging (USB to TLL)
  • Expansion
    • 2.54mm pitch 20-pin header + 10-pin header with 11 GPIOs, up to 3x I2C, IR receiver pin, 2x I2S, 2x SPI, Gigabit Ethernet, 4 ADC, 5x UART
    • 4-pin Grove connector (UART)
  • Misc – Reset button, 4x user buttons, 1x FEL button to flash the firmware
  • Power Supply – 5V
MAIX-II A Block Diagram
MAIX-II A Block Diagram
RK329 AI Camera Board pinout diagram
MAIX-II A pinout diagram

On the software side, the board supports the official Allwinner Tina Linux SDK based on OpenWrt 14.07, but an Arm Debian image will also be offered. The board will also come with the AIPU Builder supporting Tensorflow Lite and other AI frameworks compatible with the ONNX file format.

I do not understand where the H.265/H.264/JPEG video encoder is, as Allwinner R329 does not embed such a video encoder, and as I understand it OV9732 module outputs raw video data. So maybe it’s handled by the DSP or AI accelerator inside the Allwinner SoC. [Update: I’ve been informed it was just a copy/paste error, and  there’s no video encoder]

Sipeed should eventually release the information in English via Twitter and/or other sources, but right now the only information I have is only in Chinese.

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