Features Connectors， Jumpers and Dimensions Pinout and absolute maximum Ratings PX4FMU is an onboard management unit for micro air vehicles. It combines an autopilot and inertial measurement unit and enables the control of an aircraft using a single-board solution. Additional I/O can be easily connected via the 30-pin expansion bus. http://pixhawk.ethz.ch/px4/ ● 168 Mhz Cortex-M4 CPU （196 KB RAM， 1 MB Flash） ● 250 mW typical power consumption ● Reverse polarity protection on all power inputs ● 3D gyro， accelerometer and magnetometer， pressure sensors ● I2C， 3x UART， PPM， analog， GPS， 2x 5V GPIO， 4x PWM / Servo ● MicroSD card slot ● Expansion bus： CAN， 2x I2C， SPI， 4x analog， 2x UART， GPIOs ● USB Serial Port （Virtual COM Port / VCP） and bootloader ● 50 x 36 x 6 mm （1.38x1.97x0.24“）， 8g， 30x30 mm mounting holes ● 4.5-6 V wide supply input range （incl. USB power） ● Selectable 3.3 V or 5 V IO for UART2 and GPS ports