The nRF51822 is a powerful, flexible multi-protocol SoC ideal for Bluetooth® low power and 2.4GHz ultra low power wireless applications. The nRF51822 is built on a 32-bit ARM® CortexTM M0 CPU with 256kB flash + 16kB RAM. The embedded 2.4GHz transceiver supports Bluetooth low power and 2.4GHz operation, with the 2.4GHz mode being 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 Interface (PPI) system without CPU involvement. The flexible 31-pin GPIO mapping scheme allows I/O (such as serial interface, PWM, and sinusoidal demodulator) to be mapped to any device pin based on PCB demand indication. This allows for complete design flexibility in terms of pin position and function.
The nRF51822 supports the S110 Bluetooth Low Energy Protocol Stack and the 2.4GHz protocol stack (including Gazell), both of which are available free of charge in the nRF518 Software Development Kit. The nRF51822 requires 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 DCDC transformer on the chip can be selected. The use of a DC-DC transformer can be dynamically controlled during operation and the RF peak current during operation of the nRF51822 is less than 10 mA @ 3V supply (TX @ 0 dBm & RX).
The nRF51822 is available in a 6x6mm 48-pin QFN package and a 3.5x3.8mm 64-ball direct-chip package wafer-level package (WLCSP).
Main features of nRF51822:
Single chip, high flexibility, 2.4GHz multi-protocol device
32-bit ARM Cortex M0 CPU core
256KB flash 16KB RAM
Support for S110 Bluetooth Low Energy Protocol Stack
S110 requires 80 kB of memory space
Thread safety and runtime protection
Event driven API
Wireless compatible with nRF24L series
3 data rates (2Mbps/1Mbps/250kbps)
+4dBm output power
-92.5dBm sensitivity, Bluetooth low power consumption
PPI system for maximizing power efficiency applications and program code simplification requirements
Flexible power management system with automatic power management for each peripheral product
Settable I/O mapping for analog and digital I/O
nRF51822 application:
Mobile phone accessories
PC peripheral products
Consumer Electronics (CE) Remote Control
Proximity sensor/alarm sensor
Sports, fitness and health sensors
Smart RF tag
Toys and video games
Smart home equipment
Industrial and commercial sensors
Figure 1 nRF51822 block diagram
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