The nRF51822 is a powerful, highly flexible multiprotocol SoC ideally suited for Bluetooth® Smart (previously called Bluetooth low energy) and 2.4GHz ultra low-power wireless applications. The nRF51822 is built around a 32-bit ARM® Cortex™ M0 CPU with 256kB/128kB flash + 32kB/16kB RAM. The embedded 2.4GHz transceiver supports both Bluetooth Smart and the Nordic Gazell 2.4 GHz protocol stack which is on air compatible with the nRF24L series products from Nordic Semiconductor.nRF51822 incorporates a rich selection of analog and digital peripherals that can interact without CPU intervention through the Programmable Peripheral Interconnect (PPI) system. A flexible 31-pin GPIO mapping scheme allows I/O like serial interfaces, PWM and quadrature demodulator to be mapped to any device pin as dictated by PCB requirements. This enables complete design flexibility associated with pin-out location and function.nRF51822 supports Bluetooth® Smart protocol stacks as well as 2.4GHz protocol stacks, including Gazell, both available as downloads. nRF51822 requires a single power supply and gives the user the option of using on chip linear regulators giving a supply range of 1.8-3.6V, a direct 1.8V mode and a on chip DC-DC buck converter giving a supply range of 2.1-3.6V. The use of the DC-DC converter can be dynamically controlled during run time and enables nRF51822 to operate at radio peak currents below 10 mA @ 3V supply (TX @ 0 dBm & RX).Key FeaturesBluetooth 4.1 compliant low energy single-mode protocol stackLink layerL2CAP, ATT, and SM protocolsGATT, GAP, and L2CAPConcurrent Peripheral and Broadcaster rolesGATT Client and ServerFull SMP support including MITM and OOB pairingComplementary nRF51 SDK including Bluetooth profiles and example applicationsMaster Boot Record for over-the-air device firmware updateMemory isolation between application and protocol stack for robustness and securityThread-safe supervisor-call based APIAsynchronous, event-driven behaviorNo RTOS dependencyAny RTOS can be usedNo link-time dependenciesStandard ARMR Cortex™-M0 project configuration for application developmentSupport for concurrent and non-concurrent multiprotocol operationConcurrent multiprotocol timeslot APIAlternate protocol stack running in application spaceSingle chip, highly flexible, 2.4 GHz multi-protocol device32-bit ARM Cortex M0 CPU core256kB/128kB flash + 32kB/16kB RAMSupports Bluetooth Smart protocol stacksThread safe and run-time protectedEvent driven APIOn air compatible with nRF24L series3 data rates (2Mbps/1Mbps/250kbps)+4dBm output power-93dBm sensitivity, Bluetooth SmartPPI system for maximum power-efficient applications and code simplificationFlexible power management system with automatic power management of each peripheralConfigurable I/O mapping for analog and digital I/OApplicationsMobile phone accessoriesWearablesBeaconsRezence wireless charging monitoringPC peripheralsConsumer Electronics (CE) remote controlsProximity/Alert sensorsSmart HomeSports, fitness and healthcare sensorsSmart RF tagsToys and electronic gamesIntelligent domestic appliancesIndustrial and commercial sensors