NRF51822
Nordic Semiconductor
NRF51822 Multiprotocol Bluetooth 4.0 low energy/2.4 GHz RF SoC by Nordic Semiconductor (Nordic): datasheet PDF, pinout and specifications.
Integrated Circuit - IC's Nordic
Nordic Semiconductor is a Norwegian fabless company based in Trondheim. It is a leader in Bluetooth Low Energy, making the nRF51, nRF52 and nRF53 SoCs, along with nRF91 cellular IoT and Thread/Zigbee devices.
NRF51822 Multiprotocol Bluetooth 4.0 low energy/2.4 GHz RF SoC by Nordic Semiconductor (Nordic): datasheet PDF, pinout and specifications.