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Table Of Contents

BBC micro:bit v2   
Please see https://tech.microbit.org/ for latest updates!
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About the BBC micro:bit v2  2 
Hardware Description  3 
Hardware block diagram  3 ..............................................................................................................................
nRF52 Application Processor  3 .......................................................................................................................
Bluetooth Wireless Communication  4 ...........................................................................................................
Low level radio communications  4 .................................................................................................................
Buttons  5 ............................................................................................................................................................
Display  5 ............................................................................................................................................................
Motion sensor  6 .................................................................................................................................................
Temperature sensing  6 .....................................................................................................................................
Speaker  7 ...........................................................................................................................................................
Microphone  7 ....................................................................................................................................................
General Purpose Input/Output Pins  7 ...........................................................................................................
Power supply  8 ..................................................................................................................................................
Interface  9 ..........................................................................................................................................................
USB communications  9 ....................................................................................................................................
Debugging  10 ...................................................................................................................................................
Mechanical  10...................................................................................................................................................
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© Micro:bit Educational Foundation 2020

Summary of content (10 pages)

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BBC micro:bit v2 Please see https://tech.microbit.org/ for latest updates About the BBC micro:bit v2 2 Hardware Description 3 Hardware block diagram..............................................................................................................................3 nRF52 Application Processor .......................................................................................................................3 Bluetooth Wireless Communication ....................................................
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About the BBC micro:bit v2 The micro:bit is Single Board Computer (SBC) that contains an application processor with a variety of on-chip peripherals. Other peripherals are connected to this chip. An interface processor is connected to the application processer and manages communication via the USB interface, including the drag-and-drop code flashing process.
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Hardware Description Hardware block diagram nRF52 Application Processor The nRF52 application processor is where user programs run. A single, complete application including user code, runtime code and Bluetooth stack is loaded and run directly from on chip flash memory. All user accessible GPIO pins are provided by this processor. There is an onboard 2.4GHz radio peripheral used to provide Bluetooth and custom radio capabilities via an oﬀ-chip aerial.
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Bluetooth Wireless Communication The on board 2.4GHz transceiver supports Bluetooth communications via the Nordic S140 SoftDevice, which provides a fully qualified Bluetooth low energy stack. This allows the micro:bit to communicate with a wide range of Bluetooth devices, including smartphones and tablets. item details Stack Bluetooth 5.1 with Bluetooth Low Energy(BLE) Band 2.4GHz ISM (Industrial, Scientific and Medical) 2.4GHz..2.
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item details Tx power Eight user configurable settings from 0(-30dbm) to 7 (+4dbm) Payload size 32 (standard) 255 (if reconfigured) More Info Micro:bit Radio Buttons The two buttons on the front of the micro:bit, and the 1 button on the back, are tact momentary push-to-make buttons. The back button is connected to the KL27 interface processor and to the NRF52 processor for system reset purposes. This means that the application will reset regardless of if it is powered from USB or from battery.
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item details Sensing ambient light estimation via software algorithm Colour sensitivity red centric, red is 700nm Motion sensor The micro:bit has a combined accelerometer and magnetometer chip that provides 3-axis sensing and magnetic field strength sensing. It also includes some on board gesture detection (such as fall detection) in hardware, and additional gesture sensing (e.g. logoup, logo-down, shake) via software algorithms.
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item details Accuracy +/-5C (uncalibrated) More Info DAL Thermometer Speaker In addition to outputing sound via PWM on the pins, the micro:bit has a PCB mounted magnetic speaker to which sound output is mirrored.
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extra circuits can be re-allocated to general purpose use if some software features are turned oﬀ.
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item details Onboard Peripherals budget 90mA Battery connector JST X2B-PH-SM4-TB Max current provided via edge connector 190mA More Info Power supply Interface The interface chip handles the USB connection, and is used for flashing new code to the micro:bit, sending and receiving serial data back and forth to your main computer.
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item details Communications Device Class (CDC) More Info DAPLink Debugging The interface processor can be used with special host tools to debug code that is running on the application processor. It connects to the application processor via 4 signal wires. The KL27 interface processor code can also be debuged via it’s integral SWD software debug interface, for example to load initial bootloader code into this processor at manufacturing time, or to recover a lost bootloader.