====== VIM3/3L Interfaces ======

===== Top Side =====

{{products:sbc:vim3:hardware:vim3-interfaces-top-side.webp?600}}


|    ^ 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                                                                            |
| 8  | G-Sensor         | 3-axis accelerometer                                                                              |
| 9  | Function Button  | Press this 3 times in 2 seconds to enter MaskROM mode                                             |
| A  | Power Button     | This button turns on your VIM3                                                                    |
| B  | RTC Header       | A header for connecting a real-time clock (button) battery                                        |
| C  | M2 Hole          | M2 clearance holes for a case, or adding a heatsink                                               |
| D  | 40-Pin GPIO      | General input/output pins for VIM3's SoC, or plugging-in a Toneboard                              |
| E  | Infrared Module  | 2-channel infrared receiver for the Khadas IR remote                                              |
| F  | LEDs             | Indicator LEDs                                                                                    |
| G  | GPIO Expander    | Increases VIM3's available I/O beyond what A311D can provide                                      |
| H  | MCU              | STM8S003 micro-controller with programmable EEPROM                                                |
| I  | IPEX Antenna     | Wi-Fi and Bluetooth antenna connector                                                             |

===== Back Side =====

{{products:sbc:vim3:hardware:vim3-interfaces-back-side.webp?600}}


|    ^ 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 Flash             | Flash memory module that interfaces over SPI                            |
| 9  | XPWR Pads             | Connect an external power switch using these pads                       |
| A  | M-Register            | Shortcut to mask the eMMC                                               |
| B  | S-Register            | Shortcut to mask the SPI Flash                                          |
| C  | Current Limit Switch  | Prevents damage to VIM3 due to faulty loading conditions                |



===== Hardware buttons =====

{{products:sbc:vim3:hardware:vim3-buttons.webp?400}}


^  Reset  ^  Function  ^  Power  ^  Purpose                  ^
|  x      |            |         | Force Reboot VIM3         |
|         |  x         |         | Enter Upgrade Mode (TST)  |
|         |            |  x      | Power ON/Wake Up VIM3     |
|  x      |            |  x      | Enter Upgrade Mode (KEY)  |


===== GPIO header pinout =====

^ 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**     |