Giovanni, here on on the product page nrf51822 -> download -> tab "Reference Layout". You need to be registered and need to enter productkey which comes with the Dev/Eval kits.
Edit: link to pca10031
Giovanni, here on on the product page nrf51822 -> download -> tab "Reference Layout". You need to be registered and need to enter productkey which comes with the Dev/Eval kits.
Edit: link to pca10031