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Interfaces

	Component	Purpose
1	USB-A	[USB 3.0 port that swaps to 2.0 when PCI-E is active, 900mA output
2	RJ-45	Gigabit LAN port that supports Wake-On-LAN
3	HDMI	HDMI port supporting CEC
4	USB-C	USB-C port with USB power delivery (5-20Vinput) and 2.0 speeds, can be used for upgrading the OS
5	USB-A	USB 2.0 port that supports 500mA output
6	Fan Header	4-wire fan header utilising pulse width modulation
7	Reset Button	Force reboot your VIM3 in the event of a system freeze
8	Function Button	Press this 3 times in 2 seconds to enter MaskROM mode
9	Power Button	This button turns on your VIM3
A	M2 Hole	M2 clearance holes for a case, or adding a heatsink
B	G-Sensor	3-axis accelerometer
C	RTC Header	A header for connecting a real-time clock (button) battery
D	40-Pin GPIO	General input/output pins for VIM3's SoC, or plugging-in a Toneboard
E	GPIO Expander	Increases VIM3's available I/O beyond what A311D can provide
F	MCU	STM8S003 micro-controller with programmable EEPROM
G	WOL Switch	Power switch activated via Wake-On-LAN
H	Infrared Module	2-channel infrared receiver for the Khadas IR remote
I	LEDs	Indicator LEDs
J	IPEX Antenna	Wi-Fi and Bluetooth antenna connector
K	IPEX Antenna	Wi-Fi and Bluetooth antenna connector

	Component	Purpose
1	VIN	5-12V power input, supports Power-Over-Ethernet via M2X Extension
2	Micro-SD Slot	Molex Slot, spec version 2.x/3.x/4.x (SDSC/SDHC/SDXC)
3	Current Limit Switch	Prevents damage to VIM3 due to faulty loading conditions
4	M.2 Slot	PCIe 2.0 (x1 lane), supports M.2 2280 NVMe SSDs
5	TP	10-pin 0.5mm pitch FPC connector for touch input
6	MIPI-DSI	30-pin, 0.5mm pitch FPC connector for 4-lane 1080P displays
7	MIPI-CSI	30-pin, 0.5mm pitch, 4-lane, dual cameras, 8MP image signal processing
8	SPI FlashBootFromSpiFlash.html	Flash memory module that interfaces over SPI
9	XPWR Pads	Connect an external power switch using these pads
A	M-Register	Allows the EMMC to enter MaskROM mode
B	S-Register	Allows the SPI Flash to enter MaskROM mode

Reset	Function	Power	Purpose
x			Force Reboot VIM3
	x		Enter Upgrade Mode TST
		x	Power ON/Wake Up VIM3
x		x	Enter Upgrade Mode KEYS
x	x	x	Erase EMMC

Colour	Behaviour	Meaning
Blue	OFF	Power source disconnected
	Solid ON	Power source connected, SBC turned off
White	OFF	SBC turned off
	Solid ON	SBC turned on
Red	None	None

SIGNAL	PIN	PIN	SIGNAL
5V	1	21	GND
5V	2	22	I2C_M3_SCL
USB_DM	3	23	I2C_M3_SDA
USB_DP	4	24	GND
GND	5	25	I2C_AO_SCK
VCC_MCU	6	26	I2C_AO_SDA
MCU_NRST	7	27	3.3V
MCU_SWIM	8	28	GND
GND	9	29	I2SB_SCLK
ADC_CH0	10	30	I2S_MCLK0
1.8V	11	31	I2SB_SDO
ADC_CH3	12	32	I2SB_LRCK
SPDIF_OUT	13	33	I2SB_SDI
GND	14	34	GND
UARTC_RX	15	35	PWM_F
UARTC_TX	16	36	RTC_CLK
GND	17	37	GPIOH_4
Linux_RX	18	38	MCU_PA1
Linux_TX	19	39	GPIODZ_15
3.3V	20	40	GND

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