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Merge pull request #18646 from maribu/boards/nrf52dk
boards/nrf52dk: fix doc
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‎boards/nrf52dk/doc.txt‎

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@brief Support for the nRF52 DK
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## Overview:
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There are some nameless simple development Boards with an nRF52832 available.
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These boards providing access to most SoC ports. There are two buttons (RST,
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KEY), two LED’s (Pin 30, 31), a voltage regulator and a current measurement shunt
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on board. A serial connection and flashing must be provided by external
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Hardware.
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The nRF52832 is a SoC with a 32-bit ARM® Cortex™-M4F CPU with 512KiB Flash and
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64KiB RAM. The embedded 2.4GHz transceiver supports Bluetooth low energy, ANT and
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proprietary 2.4 GHz protocol stack. It is on air compatible with the nRF51
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Series, nRF24L and nRF24AP Series products from Nordic Semiconductor.
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The
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[nRF52 DK](https://www.nordicsemi.com/Products/Development-hardware/nRF52-DK)
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is a development board featuring the nRF52832 MCU with Arduino compatible
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pin headers and an integrated J-Link programmer, debugger and UART adapter.
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## Hardware:
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![nRF52 minimal development
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board](https://github.com/d00616/temp/raw/master/nrf52-minidev.jpg)
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| MCU | NRF52832 |
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|:----------------- |:------------------------------------------------------------------------------------- |
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| Family | ARM Cortex-M4F |
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| Vendor | Nordic Semiconductor |
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| RAM | 64KiB |
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| Flash | 512KiB |
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| Frequency | 64MHz |
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| FPU | yes |
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| Timers | 5 (32-bit) |
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| RTC | 3 |
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| ADCs | 1x 12-bit (8 channels) |
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| UARTs | 1 |
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| SPIs | 3 |
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| I2Cs | 2 |
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| I2S | 1 |
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| PWM | 3*4 Channels |
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| Radio | 2.4GHz BLE compatiple, -20 dBm to +4 dBm output, -96 dBm RX sensitivity |
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| Vcc | 1.7V - 3.6V |
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| Datasheet | [Datasheet](https://www.nordicsemi.com/eng/Products/Bluetooth-low-energy/nRF52832) |
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| Reference Manual | [Reference Manual](https://infocenter.nordicsemi.com/pdf/nRF52832_PS_v1.4.pdf) |
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##Pin layout
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|MCU pin|Board pin|Function|
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|:-----------|:-----------|:----------|
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|P0.0| n.c. | |
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|P0.1| n.c. | |
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|P0.2| D07 | |
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|P0.3| D08 | |
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|P0.4| D09 | KEY |
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|P0.5| D10 | |
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|P0.6| D13 | |
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|P0.7| D14 | |
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|P0.8| D15 | |
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|P0.9| n.c. | |
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|P0.10| n.c. | NFC antenna 2 (unusable) |
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|P0.11| D18 | RXD (software defined) |
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|P0.12| D19 | TXD (software defined) |
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|P0.13| D20 | |
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|P0.14| D21 | |
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|P0.15| D22 | |
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|P0.16| D23 | |
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|P0.17| D24 | |
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|P0.18| D25 | |
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|P0.19| D26 | |
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|P0.20| D27 | |
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|P0.21| RST | RESET |
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|P0.22| D28 | near Radio! -> Low drive, low frequency I/O only. |
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|P0.23| D29 | near Radio! -> Low drive, low frequency I/O only. |
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|P0.24| D30 | near Radio! -> Low drive, low frequency I/O only. |
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|P0.25| D00 | near Radio! -> Low drive, low frequency I/O only. |
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|P0.26| D01 | near Radio! -> Low drive, low frequency I/O only. |
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|P0.27| D02 | near Radio! -> Low drive, low frequency I/O only. |
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|P0.28| D03 | near Radio! -> Low drive, low frequency I/O only. |
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|P0.29| D04 | near Radio! -> Low drive, low frequency I/O only. |
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|P0.30| D05 | LED0, near Radio! -> Low drive, low frequency I/O only. |
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|P0.31| D06 | LED1, near Radio! -> Low drive, low frequency I/O only. |
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| | V33 | 3.3V for MCU |
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| | D16 | ? |
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| | D17 | ? |
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| | VBUS | 5V input |
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| | GND | |
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| | RXD | n.c. |
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| | TXD | n.c. |
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| | TD0 | n.c. |
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| | TD1 | n.c. |
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| SWDIO | TMS | |
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| SWCLK | TCK | |
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**Caution**: NFC is not usable with this board.
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![nRF52 DK](https://www.nordicsemi.com/-/media/Images/Products/DevKits/nRF52-Series/nRF52-DK/nRF52-DK/nRF52-DK-prod-page.png)
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| MCU | NRF52832 |
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|:--------------------- |:------------------------------------------------------------------------------------- |
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| Family | ARM Cortex-M4F |
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| Vendor | Nordic Semiconductor |
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| RAM | 64 KiB |
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| Flash | 512 KiB |
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| Frequency | 64 MHz |
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| FPU | yes |
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| Timers | 5 (32-bit) |
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| RTC | 3 |
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| ADCs | 1x 12-bit (8 channels) |
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| UARTs | 1 |
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| SPIs | 3 |
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| I2Cs | 2 |
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| I2S | 1 |
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| PWM | 3*4 Channels |
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| Radio | 2.4GHz BLE compatiple, -20 dBm to +4 dBm output, -96 dBm RX sensitivity |
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| Vcc | 1.7V - 3.6V |
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| MCU Datasheet | [Datasheet](https://www.nordicsemi.com/eng/Products/Bluetooth-low-energy/nRF52832) |
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| MCU Reference Manual | [Reference Manual](https://infocenter.nordicsemi.com/pdf/nRF52832_PS_v1.4.pdf) |
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| Board Datasheet | [User Guide](https://infocenter.nordicsemi.com/pdf/nRF52_DK_User_Guide_v1.3.1.pdf) |
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### RESET pin configuration
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