YuzukiCube-M Base Board

04_BaseBoard/V1.0/ is the base board (carrier board) for the YuzukiNeko. There is no SoC on the base board: the YuzukiNeko module itself is fitted on the base board as U1 (YuzukiNeko-SMT in the BOM, 49 pads), and the base board routes the module’s MIPI DSI, SDIO, UART, TWI, CAN and other signals to the actual devices and connectors.

Tip

The project file name is YuzukiCube-M, while the title block of the schematic still says YuzukiNeko (REV: V1.0, 2026-10-09). Both refer to the same base board.

Caution

The pin mapping in this page is read from the netlist of the base board schematic 04_BaseBoard/V1.0/01_SCH/SCH_Schematic2_2026-10-10.pdf; before wiring anything, treat that schematic as authoritative. The net names use the module’s actual GPIO names; if you have fitted a V1.3 module, convert the silkscreen labels using the errata.

Onboard devices

Designator	Device	Function
U1	YuzukiNeko-SMT	The module itself, 49 pads; every other circuit on the base board hangs off it
U3	AIC8800D80	Wi-Fi / Bluetooth module (LGA-44), antenna via RF1
U5	TJA1051T/3/1J	CAN transceiver, connected to CAN0, with CANH / CANL broken out
U2	LPA4890MSF	Audio amplifier, input taken from HPOUT, output SPKR+ / SPKR-
U4	RY3730	Backlight boost (L1 4.7 µH, D1 B5819WS), output VLED-A / VLED-K
U10	MT3520B	Buck converter, VSYS-5V → VCC-3V3 (L2 2.2 µH)
FPC1	FPC-05F-40PH20	40-pin 0.5 mm FPC: MIPI DSI + backlight + capacitive touch
CN1	HC-1.25-2PLT	2-pin 1.25 mm, HPOUT analog audio
CN2	1.25-5P WT	5-pin 1.25 mm, breaks out UART1-RX / UART1-TX and UART4-RX / UART4-TX
CN3	HC-1.25-2PLT	2-pin 1.25 mm, SPKR+ / SPKR- speaker
RF1	BWIPX-1-001E	IPEX / u.FL antenna socket (Wi-Fi / Bluetooth)
H1	2.54 mm 2-pin header	Breaks out VSYS-5V and GND
SW1	TC-6615-5-260G	Tactile switch, connected to PD5 (DOWN net)

Module pins used

Module pin	Base board net	Purpose
PD0 / PD1	CTP-SCK / CTP-SDA	TWI1 for capacitive touch (F4)
PD2 / PD3	CTP-INT / CTP-RST	Touch interrupt and reset
PD4	PA-SHDN	Audio amplifier enable
PD5	DOWN	Button SW1, the same pin as the module’s UF2 downloader button
PD6 / PD7	UART4-TX / UART4-RX	Serial port, brought out to CN2 (F5)
PD8	BT-RST-N	Bluetooth reset
PD9	DSI-RST	Display reset
PD12–PD21	DSI-D0P/N, DSI-D1P/N, DSI-CKP/N, DSI-D2P/N, DSI-D3P/N	MIPI DSI, four data lanes plus clock (F4)
PD22	DSI-PWM	Backlight dimming (F4 PWM0-2)
PB0 / PB1	UART1-TX / UART1-RX	Serial port, brought out to CN2 (F4)
PB2 / PB3	CAN-TX / CAN-RX	CAN0, connected to U5 (F6)
PE0–PE5	SDC2-D1, SDC2-D0, SDC2-CLK, SDC2-CMD, SDC2-D3, SDC2-D2	SDIO for Wi-Fi (F9)
PE6–PE9	UART2-TX, UART2-RX, UART2-RTS, UART2-CTS	Bluetooth HCI serial port (F3)
PE10	WL-REG-ON	Wi-Fi module power enable

Tip

PB0 / PB1 are also the console UART1 of the Zephyr yuzukineko board in the module documentation, so on the base board you can connect CN2 to see the console output.

Display and touch

FPC1 is a single 40-pin ribbon that carries three signal groups at once:

• MIPI DSI: DSI-D0P/N, DSI-D1P/N, DSI-CKP/N, DSI-D2P/N, DSI-D3P/N, with reset controlled by DSI-RST on PD9.
• Backlight: VLED-A comes from the U4 boost output, its return is VLED-K, and brightness is dimmed by DSI-PWM on PD22.
• Capacitive touch: CTP-SCK / CTP-SDA go over TWI1, with interrupt and reset on CTP-INT / CTP-RST.

Power

• VSYS-5V: comes from the module’s 5V pin (USB-C VBUS). The buck converter U10, the CAN transceiver U5, the audio amplifier U2 and H1 all draw from this rail.
• VCC-3V3: produced by U10 stepping down VSYS-5V.
• VSYS-3V3: the module’s 3V3 output.
• VLED-A / VLED-K: the U4 boost, dedicated to the backlight.

The base board has no battery or charging circuit; VSYS-5V comes entirely from the module’s USB-C.

Pin conflicts with the base board fitted

• PE0–PE5 are taken by the Wi-Fi SDIO, and the module’s I2S0 needs PE4, while PD6–PD9 are also taken by UART4, BT-RST-N and DSI-RST, so I2S0 is unavailable on the base board.
• In the module documentation PE10 is the onboard audio amplifier enable; the base board uses PD4 (PA-SHDN) for amplifier enable instead and gives PE10 to WL-REG-ON.
• On the module PD0–PD3 are ordinary GPIO or SPI1; on the base board they are used for touch.

Files

04_BaseBoard/V1.0/ has the same structure as the seven entries under 01_Hardware/: 01_SCH, 02_PCB, 03_Gerber, 04_3D, 05_BOM, 06_PickAndPlace, 07_Project. Besides the PCB model, 04_3D/ also contains an enclosure, 3DShell_PCB2.zip, which is a different thing from the module’s 3D-printed enclosure.

For an overview of the directories see Hardware file list, and for licensing see License.