nRF51 應用處理器IC是讓使用者作主要程式控制的處理器，完整的程式包含了使用者客制及中介層(runtime) 及藍芽協議層(Stack)，(譯者註:瀏覽器編譯環境會在使用者程式寫完同時，將這三部分整合完成) 一旦使用者將完整程式(HEX 檔)放在USB 快閃記憶體根目錄上，處理器便會直接執行程式碼。使用者也可對連接在這處理器上的GPIO去做控制. 也可透過 2.4GHz 無線去做相關周邊的控制.

項目	說明
Model	Nordic nRF51822-QFAA-R rev 3
Core variant	ARM Cortex-M0 32 bit processor
Flash ROM	256KB
RAM	16KB
Speed	16MHz
Debug	SWD, jlink/OB
More Info	here

藍芽通訊

板子上2.4G無線相關設計提供了對手機平板的藍芽通訊功能

項目	說明
Stack	Bluetooth 4.1 with Bluetooth low energy
Band	2.4GHz ISM (Industrial, Scientific and Medical) 2.4GHz..2.41GHz
Channels	50 2MHz channels, only 40 used (0 to 39), 3 advertising channels (37,38,39)
Sensitivity	-93dBm in Bluetooth low energy mode
Tx Power	-20dBM to 4dBm in 4 dB steps
Role	GAP Peripheral
Congestion avoidance	Adaptive Frequency Hopping
Profiles	1 BBC micro:bit profile
More Info	here

無線通訊

板子上2.4G無線相關設計提供另外的無線通訊協議（Nordic Gazell），這通訊協議已經在不同的程式語言環境可以直接使用，並且可以在多個microbit 裝置中互相傳遞並且群組化（group code ）.

項目	說明
Protocol	Nordic Gazell
Freq band	2.4GHz
Channel rate	1Mbps or 2Mbps
Encryption	None
Channels	101 (0..100)
Group codes	255
Tx power	Eight user configurable settings from 0(-30dbm) to 7 (+4dbm)
Payload size	32 (standard) 255 (if reconfigured)
More Info	here

按鍵

Microbit 正面有兩個按鈕，背面有一個。背面的按鍵連接至KL26 介面ＩＣ及 nRF51 處理器做系統重制用(reset)

正面的按鍵A 、 B 是可以由使用者去做程式控制包括了短壓、長壓或是A、B同時按，按鍵A、B 均連接至金手指（edge connector）上的GPIO ，加上電路設計可以做logic 0 或 1值的操作.

項目	說明
Type	2 tactile user buttons, 1 tactile system button
Debounce	(A & B) software debounced, 54ms period
Pullup	(A & B) external 4K7, (System) 10K

顯示

在板子上有5x5 陣列LEDs.做為顯示屏，microbit 是以3x9 陣列電路去控制它.並用很高的速度去刷新它。以下暫不翻譯但保留（ LED matrix is also used to sense ambient light, by repeatedly switching some of the LED drive pins into inputs and sampling the voltage decay time, which is roughly proportional to ambient light levels.）

項目	說明
Type	minature surface mount red LED
Physical structure	5x5 matrix
Electrical structure	3x9
Intensity control	10 steps
Intensity range	TBC
Sensing	ambient light estimation via software algorithm
Sensing Range	TBC, 10 levels from off to full on
Colour sensitivity	red centric, red is 700nm

重力感測器（加速度感測器）

重力感測器是經由I2C 跟處理器連結，並提供了三軸的感應資料並包含了手勢感測的演算法 (like : fall detection, logo-up, logo-down, shake)

項目	說明
Model	Freescale MMA8653FC
Features	3 axis, 2/4/8g ranges
Resolution	10 bits (0..1023)
Max output data rate	800Hz
On board gestures	‘freefall’
Other gestures	Other gestures are implemented by software algorithms in the runtime.

磁力感測器

磁力感測器也是透過I2C 跟處理器連結，提供了磁力感測數值，並提供指南針功能，（The compass must be calibrated before use, and the calibration process is automatically initiated by the runtime software – 譯者對這段有些疑慮，暫不翻譯）

項目	說明
Model	Freescale MAG3110
Max update rate	80Hz
Full Scale range	1000uT
Sensitivity	0.10uT

溫度感測

nRF51 處理器提供了板子上的即時溫度感測(Run time ambient temperature sensing ).

項目	說明
Type	on-core nRF51
Sensing range	-25C .. 75C
Resolution	0.25C steps
Accuracy	+/-4C (uncalibrated)
More Info	here

數位輸入輸出(GPIO)

金手指 (edge connector) 上有許多 GPIO 。處理器上有許多的多工訊號針腳(pin define) ，有些已經設定成GPIO 功能連接至金手指，如何進一步使用這些針腳請參閱 (nRF51 data sheet)

項目	說明
Rings	3 large IO rings and two large power rings, 4mm plug and crocodile clip compatible
GPIO features	19 assignable GPIO pins
	2 are assigned to the on board I2C interface
	6 are used for display or light sensing feature
	2 are used for on board button detection
	1 is reserved for an accessibility interface
	19 may be assigned as digital input or digital output
	19 may be assigned for up to 3 simultaneous PWM channels
	19 may be assigned for 1 serial transmit and 1 serial receive channel
	6 may be assigned as analog input pins
	3 may be assigned to an optional SPI communications interface
	3 may be assigned for up to 3 simultaneous touch sensing inputs
ADC resolution	10 bit (0..1023)
Edge Connector	Edge connector data sheet
Pitch	1.27mm, 80 way double sided.
Pads	5 pads, with 4mm holes
More Info	here

電力供應

給microbit的電力，主要是由介面IC透過USB 提供，亦可由電池盒連接器提供，在金手指上亦有電力供應的功能，需要熟悉電路設計的人操作.

項目	說明
Operating range	1.8V .. 3.6V
USB current	120mA max
Onboard Peripherals budget	30mA
Battery connector	JST X2B-PH-SM4-TB
Battery current	TBC
Max current provided via edge connector	90mA
More Info	here

介面

這介面IC提供USB連結功能、拖拉式程式刷新(drag and drop flash program)及跟主電腦做序列通訊(serial communication) .

項目	說明
Model	Freescale MKL26Z128VFM4
Core variant:	ARM Cortex-M0+
Flash ROM	32KB
RAM	4KB
Speed	16MHz
Debug capabilities	SWD
More Info	here

USB通訊

主要意思跟上一段雷同，不做翻譯但保留原文(The micro:bit has an on board USB communications stack, that is built into the firmware of the interface chip. This stack provides the ability to drag and drop files onto the MICROBIT drive in order to load code into the application processor. It also allows serial data to be streamed to and from the micro:bit application processor over USB to an external host computer, and supports the CMSIS-DAP protocol for host debugging of application programs.)

項目	說明
Connector	USB micro, MOLEX_47346-0001
USB version	1.1 Full Speed device
Speed	12Mbit/sec
USB classes supported	Mass Storage Class (MSC)
	Communications Device Class (CDC)
More Info	here

除錯

譯者尚未做過這段的實務操作所以暫不翻譯先保留原文(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 KL26 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.)