micro:bit

Hardware

The physical board measures 43 mm × 52 mm and, as of the start of final manufacturing, includes:

• Nordic nRF51822 – 16 MHz 32-bit ARM Cortex-M0 microcontroller, 256 KB flash memory, 16 KB static ram, 2.4 GHz Bluetooth low energy wireless networking. The ARM core has the capability to switch between 16 MHz or 32.768 kHz.
• NXP/Freescale KL26Z – 48 MHz ARM Cortex-M0+ core microcontroller, that includes a full-speed USB 2.0 On-The-Go (OTG) controller, used as a communication interface between USB and main Nordic microcontroller. This device also performs the voltage regulation from the USB supply (4.5-5.25V) down to the nominal 3.3 volts used by the rest of the PCB. When running on batteries this regulator is not used.
• NXP/Freescale MMA8652 – 3-axis accelerometer sensor via I²C-bus.
• NXP/Freescale MAG3110 – 3-axis magnetometer sensor via I²C-bus (to act as a compass and metal detector).
• MicroUSB connector, battery connector, 23-pin edge connector.
• Display consisting of 25 LEDs in a 5×5 array.
• Three tactile pushbuttons (two for user, one for reset).