The brain: Rockchip RK3588S core board Read
A plug-in core board marked XF_RK_Core_Board_V10 carries a Rockchip RK3588S, two Biwin BWMZCX32H2A-32G-X memory chips, Biwin BWCTAKJ11X64G 64 GB storage and a Rockchip power chip, most likely the RK806. The silkscreen says 8+64G.
Why it matters. The Unitree Go2 uses the identical board but with every chip ground blank. Here the markings survived, so this robot is how we know what the Go2's brain is.
- RK3588S: 4× Cortex-A76 + 4× Cortex-A55, 6 TOPS neural accelerator.
Main board: "711 MAIN BOARD", ver 0.16 Read
Dated 2024/8/15. The core board plugs into its middle. Around it: the Wi-Fi module, the remote-radio module, two USB-C ports, RST, REC and BOOT buttons, a speaker and a fan connector, and the battery input marked BAT+, BAT− and BAT_485, a data line to the battery, the same idea as the Go2's B_485.
Four large numbered power connectors most likely feed the four limb chains (two legs, two arms); that reading is ours, the board only numbers them.
Underside chips: ground blank Ground blank
On the back of the main board, a many-legged control chip and a large square chip have had their markings ground off, the same treatment the Go2 got.
Joint drivers: 711A and 711B Read
Every joint has its own round driver board fixed to the motor. There are two sizes: 711A_MDRV_V1.1 (about 7 cm, dated 2024/7/9) and 711B MDRV V1.0 (about 5 cm, dated 2024/5/27, Unitree logo in the middle). Each has a power connector in and a power connector out, so the joints are chained together on one cable.
Why. The main computer sends each joint a target; the board next to the motor does the fast current control. It is the same design as the Go2's leg drivers, in two sizes because a hip needs far more torque than a wrist.
Balance: "711-EXT-IMU" board Read
A separate motion-sensor board, 711-EXT-IMU V0.1, dated 2024/9/25, with an "UP" arrow printed on it. A humanoid has to know which way is down at every moment to stay upright; this board is where that measurement is made.
Wi-Fi and Bluetooth: Realtek module Matched
A green module with two antenna sockets and a Realtek chip whose part number reads as the RTL8852 family, the same Wi-Fi 6 family as the Go2. The last letters are not sharp enough to confirm. Antennas run through a 711 ANT BOARD V0.2, and a Bluetooth antenna is marked separately.
Remote link: the Go2's radio board Matched
A small black module beside the Wi-Fi carries the silkscreen YS.PPRF, the name of the Go2's remote-control radio board. Same board, same job: the link to the handheld remote.
Adem Inside