Click to buy now DR4-S905 open source motherboard＞＞
（DR4-S905 open source motherboard positive）
（DR4-S905 open source motherboard negative）
| Size | length 180mm x width 106mm x height 12mm |
| CPU | AMLOGIC A55*4 |
| NPU | 1.2 TOPS computing power |
| GPU | Mali G31 MP2 |
| RAM | LPDDR4 standard 2GB（1GB/4GB batch optional) |
| Memory | EMMC 5.1 standard 16GB（8GB/32GB/64GB/128GB batch optional) |
| Power management | Discrete design |
| Operating voltage | 12V above 1.5A |
| Watchdog | External watchdog circuit, controllable by APP |
| Support system | Android9.0/Linux+QT |
| Operating temperature | -25℃ to +75℃ |
| Life | Continuous operating life is more than 5 years |
| USB HOST | 5 way USB ports, 3 external connections (one of which is OTG), 2 internal connections |
| Serial port | 2 way TTL serial port |
| GPIO | 14 way reserved GPIO |
| MIPI DSI display | 1 way DSI display output up to 1920x1080 |
| HDMI display output | Support HDMI display output 4K/1080P |
| MIPI CSI enter | 2 way CSI MIPI camera interface |
| Voice output | 2 way speaker output 3W/8 ohm |
| TF card | Support TF card |
| 3G/4G | 4G function, PCI-E 3G/4G Internet |
| GPS | External GPS (optional) |
| WIFI | 1 way 2.4G WIFI |
| Bluetooth | 1 way 2.4G bluetooth,support 4.2 BLE |
| Ethernet | 1 way 10M/100M |
| Output power | 3 way connector output 3.3V 5V 12V |
| System upgrade | Support local USB upgrade |
| RTC real time clock | External button battery supports power-down time saving |
| Function list | Linux4.9 Android 9.0 | Linux4.9 buildroot |
| Hardware function | ||
| 7 inch MIPI screen +I2C touch(1024x600) | √ | √ |
| 7 inch MIPI screen +I2C touch(1200x1920) | √ | √ |
| 8 inch MIPI screen +I2C touch(800x1280) | √ | √ |
| MIPI interface | √ | √ |
| HDMI 1080P interface | √ | √ |
| CVBS | √ | √ |
| Capacitive screen interface | √ | √ |
| MIPI camera | √ | NO |
| USB camera | √ | √ |
| USB HOST | √ | √ |
| USB OTG | √ | NO |
| GPIO | √ | √ |
| Function button | √ | √ |
| SDIO AP6236 WIFI | √ | √ |
| UART AP6236 BT 4.0 | √ | √ |
| Ethernet 10M/100M | √ | √ |
| Speaker | √ | √ |
| Serial port | √ | √ |
| TF card | √ | √ |
| RTC | √ | √ |
| 4G or 4G module expansion | √ | √ |
| NPU | √ | √ |
| Driver list | ||
| SPI driver | √ | √ |
| ADC driver | √ | √ |
| I2C driver | √ | √ |
| PWM driver | √ | √ |
| SDIO driver | √ | √ |
| GPIO driver | √ | √ |
| USB driver | √ | √ |
| Project | Least | Typical | Maximum | |
| Power parameters | Voltage | 6.5V | 12V | 15V |
| Ripple | -- | -- | 50mV | |
| Current | 75mA | -- | -- | |
Power supply current （No other peripherals） | Start current | -- | 102mA | 305mA |
| Play sound | 125mA | 155mA | ||
Power supply current （Connect the display） | HDMI | 205mA | 355mA | |
| RTC battery drain | 1uA | 3uA | ||
| Surroundings | Relative humidity | -- | 65% | 75% |
| Operating temperature | -25℃ | -- | 75℃ | |
| Storage temperature | -30℃ | -0℃ | 90℃ | |
Click to buy now DR4-S905 open source motherboard＞＞
（DR4-S905 open source motherboard positive）
（DR4-S905 open source motherboard negative）
| Size | length 180mm x width 106mm x height 12mm |
| CPU | AMLOGIC A55*4 |
| NPU | 1.2 TOPS computing power |
| GPU | Mali G31 MP2 |
| RAM | LPDDR4 standard 2GB（1GB/4GB batch optional) |
| Memory | EMMC 5.1 standard 16GB（8GB/32GB/64GB/128GB batch optional) |
| Power management | Discrete design |
| Operating voltage | 12V above 1.5A |
| Watchdog | External watchdog circuit, controllable by APP |
| Support system | Android9.0/Linux+QT |
| Operating temperature | -25℃ to +75℃ |
| Life | Continuous operating life is more than 5 years |
| USB HOST | 5 way USB ports, 3 external connections (one of which is OTG), 2 internal connections |
| Serial port | 2 way TTL serial port |
| GPIO | 14 way reserved GPIO |
| MIPI DSI display | 1 way DSI display output up to 1920x1080 |
| HDMI display output | Support HDMI display output 4K/1080P |
| MIPI CSI enter | 2 way CSI MIPI camera interface |
| Voice output | 2 way speaker output 3W/8 ohm |
| TF card | Support TF card |
| 3G/4G | 4G function, PCI-E 3G/4G Internet |
| GPS | External GPS (optional) |
| WIFI | 1 way 2.4G WIFI |
| Bluetooth | 1 way 2.4G bluetooth,support 4.2 BLE |
| Ethernet | 1 way 10M/100M |
| Output power | 3 way connector output 3.3V 5V 12V |
| System upgrade | Support local USB upgrade |
| RTC real time clock | External button battery supports power-down time saving |
| Function list | Linux4.9 Android 9.0 | Linux4.9 buildroot |
| Hardware function | ||
| 7 inch MIPI screen +I2C touch(1024x600) | √ | √ |
| 7 inch MIPI screen +I2C touch(1200x1920) | √ | √ |
| 8 inch MIPI screen +I2C touch(800x1280) | √ | √ |
| MIPI interface | √ | √ |
| HDMI 1080P interface | √ | √ |
| CVBS | √ | √ |
| Capacitive screen interface | √ | √ |
| MIPI camera | √ | NO |
| USB camera | √ | √ |
| USB HOST | √ | √ |
| USB OTG | √ | NO |
| GPIO | √ | √ |
| Function button | √ | √ |
| SDIO AP6236 WIFI | √ | √ |
| UART AP6236 BT 4.0 | √ | √ |
| Ethernet 10M/100M | √ | √ |
| Speaker | √ | √ |
| Serial port | √ | √ |
| TF card | √ | √ |
| RTC | √ | √ |
| 4G or 4G module expansion | √ | √ |
| NPU | √ | √ |
| Driver list | ||
| SPI driver | √ | √ |
| ADC driver | √ | √ |
| I2C driver | √ | √ |
| PWM driver | √ | √ |
| SDIO driver | √ | √ |
| GPIO driver | √ | √ |
| USB driver | √ | √ |
| Project | Least | Typical | Maximum | |
| Power parameters | Voltage | 6.5V | 12V | 15V |
| Ripple | -- | -- | 50mV | |
| Current | 75mA | -- | -- | |
Power supply current （No other peripherals） | Start current | -- | 102mA | 305mA |
| Play sound | 125mA | 155mA | ||
Power supply current （Connect the display） | HDMI | 205mA | 355mA | |
| RTC battery drain | 1uA | 3uA | ||
| Surroundings | Relative humidity | -- | 65% | 75% |
| Operating temperature | -25℃ | -- | 75℃ | |
| Storage temperature | -30℃ | -0℃ | 90℃ | |