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Built around a 32-bit ARM® Cortex™ M0 CPU, Nordic Semiconductor's nRF51422 is the first-ever system on chip (SoC) solution to support the ANT protocol. The device now comes unprogrammed, ready for loading with Nordic's available SoftDevice protocols stacks and the developer's application. The S210 ANT 8-channel protocol stack and the S310 ANT 8-channel / Bluetooth low energy peripheral protocol stack are both available as downloadable SoftDevices from Nordic's website.

The nRF51422 incorporates a rich selection of analog and digital peripherals that can interact without CPU intervention through the Programmable Peripheral Interface (PPI) system. A flexible 31-pin GPIO mapping scheme allows I/O such as 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.

The nRF51422 is available in a 48-pin 6x6 QFN package in a 256kB and 128kB flash configuration. The 256kB flash version is also available in 3.5x3.8mm 64 ball WLCSP packages. 

Manufacturer's Product Page

Key Enhancements

  • Supports programmable SoftDevice protocol stacks for easy access to new features and improvements
    • S210 ANT 8-channel stack
    • S310 ANT / Bluetooth low energy peripheral stack
  • ANT Burst transfer rate up to 60Kbps (true data throughput)
  • Up to 8 public, managed and/or private ANT network keys
  • AES-128 data encryption option for ANT data transfers

Advanced ANT Features:

  •  Individual output power control per channel
  • Channel ID management – improve device pairing efficiency
  • Low priority search – does not impact existing channels
  • Scanning mode – extremely low latency for asynchronous applications such as remote control
  • Proximity search
  • Frequency agility
  • High density node support – up to 300 nodes at 1 Hz Tx rate in same RF space

ANT Basics:

  • 78 selectable RF channels
  • Up to 8 independent ANT channels
  • Broadcast, acknowledged or burst data transfer
  • 8 byte data payload per message
  • Minimum message rate per ANT channel 0.5Hz
  • ANT channel combined message rate up to 190Hz (TBD)

Hardware Features

  • Single chip, highly flexible, 2.4GHz multi-protocol device
  • 32-bit ARM Cortex M0 CPU core
  • 256KB or 128KB flash options; 16KB RAM
  • Thread-safe and run-time protected
  • +4dBm to -20dBm output power
  • PPI system for maximum power-efficient applications and code simplification
  • Flexible power management features
  • Configurable I/O mapping for analog and digital I/O

Ultra low power consumption

  • 6.3mA - TX at -4dBm (3V using on-chip DC-DC)
  • 8.1mA - TX at 0dBm (3V using on-chip DC-DC)
  • 9.5mA – RX (3V using on-chip DC-DC)
  • 8mA - TX at -4dBm(No DCDC)
  • 10.5mA - TX at 0dBm(No DC-DC)
  • 13mA - RX at 1Mbps
  • 420nA - Sleep, no RAM retention
  • 530nA - 8k RAM retention
  • 2µA - All peripherals in idle mode

2.4GHz Radio

  • +4dBm to -20dBm output power
  • -96dBm RX sensitivity at 250kbs
  • -90dBm RX sensitivity at 1Mbps
  • -85dBm RX sensitivity at 2Mbps
  • 2Mbps/1Mbps/250kbps programmable on air data rate
  • Excellent co-existence performance
  • Compatible with 16MHz ± 40ppm crystal


  • 32-bit ARM® Cortex™ M0 32-bit CPU


  • 256KB / 128KB embedded flash options
  • 16KB RAM

System Peripherals

  • 3 x 16/24-bit timers with counter mode
  • 16 channel CPU independent Programmable Peripheral Interconnect (PPI)
  • Encryption -128-bit AES ECB/CCM/AAR co-processor
  • RNG
  • RTC
  • Temperature sensor


  • Flexible GPIO pin configuration
  • 31 GPIO
  • Up to 4 PWM

Digital I/O

  • Digital interfaces -SPI Master, 2-wire, UART
  • Quadrature decoder

Analog I/O

  • 8/9/10 bit ADC - 8 configurable channels


  • 16MHz XO
  • 16MHz RCOSC
  • 32HHx XO
  • 32kHz RCOSC

Power Management

  • Wide supply voltage range (1.8v to 3.6V)
  • Flexible power management scheme
  • On-chip DC/DC converter
  • 420nA @ 3V OFF mode
  • 2.5µA @ 3V ON mode, all blocks in idle mode
  • 530nA @ 3V OFF mode + 1 region RAM retention


Discuss the product at ANT Forum.


For the Nordic Semiconductor's product specification, reference design and other technical documents, please download from here

For more ANT resources, please click here.

Title Date Modified Version File Size
ANT Message Protocol and Usage Apr 02, 2014 5.1 4 MB
ANTware II Nov 12, 2013 4.1.00 1 MB
ANTware II Users Guide Oct 09, 2013 1.2 1 MB

1. Initial Setup

2. Channel Data

3. Battery Information