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IMM-NRF52840 (BLYST840)

Bluetooth® 5, Zigbee, Thread Module

BLYST840 is built around the Nordic nRF52840 32-bit ARM® Cortex™-M4F CPU with floating point unit running at 64 MHz. It has protocol support for Bluetooth 5, Bluetooth mesh, Thread, Zigbee, 802.15.4, ANT and 2.4 GHz proprietary stacks.

  • It is a fingertip size 14 x 9 x 1.5 mm SoM with all required components (crystals, coils, DC/DC, etc.) built-in and ready to use. So you don't need to take up more board space with add-on components needed to support a given module
  • It’s designed as a feature-rich but tiny and ultra-low-power SoM to make it easy to integrate into your own projects and IoT hardware.
  • BLYST840 has 46 I/O, 1 MB flash, 256 kB RAM, is ready for Bluetooth® 5.2, is Thread and ZigBee capable, is NFC-enabled, has built-in security measures, and supports MicroPython.


BLYST840 modules are designed so that no extra PCB space or any external components are required on user’s application board for all the functionality of the nRF52840.

  • Controller: Nordic Semiconductor nRF52840
    • 32-bit ARM Cortex-M4F
    • 64 MHz
    • 1 MB flash
    • 256 KB RAM (RAM mapped FIFO using EasyDMA)
  • I/O:
    • All 46 I/O pins are exposed via pads around the edges of the module
    • QSPI/SPI/2-wire/I2S/PDM/QDEC
    • Programmable Peripheral Interface - PPI
    • High speed SPI interface 32 MHz
    • Quad SPI interface 32 MHz
    • EasyDMA for all digital interfaces
    • USB 2.0 (12 Mbits)
      • Built-in inductors as a DC/DC converter for USB powering
      • Termination resistors for reliable communications
  • Wireless protocols:
    • Bluetooth 5.2 ready
      • High throughput: up to 2 Mbps
    • Long range: -96 dBm sensitivity
    • Advertising extensions
    • Improved coexistence (CSA #2)
    • Bluetooth Low Energy
      • Up to 111 dB link budget
    • Bluetooth Mesh
    • IEEE 802.15.4 radio support
    • Thread
    • Zigbee
    • NFC-A
  • Wireless reception:
    • Built-in ceramic antenna
    • Programmable output power from +8 dBm to -20 dBm
    • High-precision RSSI
    • Quadrature demodulator
    • 12-bit/200K SPS ADC
  • Security:
    • ARM® TrustZone® Cryptocell 310
    • 128-bit AES/ECB/CCM/AAR co-processor
  • Software:
    • MicroPython
    • IOsonata open source multi-architecture multi-platform object-oriented design library
    • Eclipse IDE
    • Nordic SDKs
  • Power:
    • Flexible power configurations for USB power or low voltage/battery power
    • Wide supply voltage range 1.7 V to 5.5 V
    • Regulated supply for external components up to 25 mA
    • Built-in inductors for low power DC/DC mode
    • Built-in 32 MHz & 32.768 MHz crystal for low power
  • Size: Finger tip size dimensions - 14 x 9 x 1.6 mm
  • Certifications: FCC, IC & CE certified. Can be integrated into product design without needing to worry about wireless certification.

Frequency band


On-air data rate

2Mbs/1Mbs/500kbs/125kbs - Bluetooth low energy

250kbs – 802.15.4

2Mbs/1Mbs – 2.4GHz proprietary

Output power

Programmable -20dBm to +8dBm


Bluetooth 5: -103dBm at 125kbs, -99dBm at 500kbs, -96dBm at 1Mbs, -92dBm at 2Mbs

802.15.4: -100dBm at 250kbs

ANT: -92.5dBm at 1Mbs

2.4GHz: -92.5dBm at 1Mbs, -89dBm at 2Mbs

Radio current con­sumption DC-DC at 3v

4.8mA TX at 0dBm, DC/DC at 3V

14.8mA TX at +8dBm, DC/DC at 3V

9.6mA TX at +4dBm, DC/DC at 3V

4.6mA RX at 1Mbps


ARM Cortex-M4F

Program memory

1MB Flash with cache




32MHz crystal oscillator, 64MHz RC oscil­lator, 32kHz crystal oscillator, 32kHz RC oscillator

System current consumption

0.5μA at 3V System OFF mode, no RAM retention

1.5μA System ON mode, no RAM retention

0.7μA All peripherals in IDLE mode

0.03μA per 4kB RAM retention

Hardware security

128-bit AES ECB/CCM/AAR co-processor


ARM CryptoCell 310


48 configurable

Digital I/O

QSPI x 1, SPI master x 3, SPI slave x 3, 2-wire master x 2, 2-wire slave, UARTE x 2, Quadrature decoder, PDM, I²S


12-bit/200ksps ADC, RNG, LP comparator, WDT, PWM x 4




USB 2.0 (12Mbs)

Power supply



32-bit timers x 5, RTC x 3

Package options

AQFN73, 7x7mm



  • IoT
    • Smart Home products
    • Industrial mesh networks
    • Smart city infrastructure
  • Interactive entertainment devices
    • Advanced remote controls
    • Gaming controllers
  • Advanced wearables
    • Connected watches
    • Advanced personal fitness devices
    • Wearables with wireless payment
    • Connected Health
    • Virtual/Augmented Reality applications
BLYST840 Exploration Kit at image

BLYST840 Module at image or image

BLYST840 Breakout Board at image
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