The nRF51822 is built on a 32-bit ARM® Cortex™ M0 CPU with 256kB flash + 16kB RAM. The embedded 2.4GHz transceiver supports Bluetooth Low Energy and 2.4GHz operation, where the 2.4GHz mode is wirelessly compatible with Nordic Semiconductor’s nRF24L family of products.
The nRF51822 also features a rich set of analog and digital peripherals that can interact through a Programmable Peripheral Product Interconnect (PPI) system without CPU involvement. A flexible 31-pin GPIO mapping scheme allows I/O to be mapped to any device pin as dictated by PCB requirements. This allows complete design flexibility and pin location and function.
The nRF51822 is a powerful, flexible, multi-protocol SoC ideal for Bluetooth low energy and 2.4GHz ultra-low energy wireless applications.
The nRF51822 supports the S110 Bluetooth Low Energy protocol stack and the 2.4GHz protocol stack (including Gazell), both of which are provided free of charge in the nRF518 software development kit. nRF51822 needs a separate power supply. If the power supply range is between 1.8-3.6V, the user can choose to use the on-chip linear rectifier. If the power supply range is between 2.1-3.6V, the DC 1.8V mode and the on-chip DCDC transformer can be selected.
In addition, for the NRF51802 chip of the same series as the NRF51822, the FLASH RAM capacity of these two chips is the same. The difference is that there are slight differences in sensitivity, power consumption, standby current and internal wake-up time. The comprehensive data displayed by the 51822 is better. Usually, The two models are interchangeable.
At present, our company has realized the reverse analysis, decryption and analysis optimization of NRF51822 and NRF51802 Bluetooth chips.