Bluetooth 5.2 SoC in a WLCSP optimized for small two-layer PCB designs

Written by Mike Benson

June 19, 2020

The nRF52805 System-on-Chip (SoC) augments the industry-leading nRF52 Series with an SoC in a WLCSP optimized for small two-layer PCB designs, ideal for cost-constrained applications. It is the perfect choice for applications such as beacons, disposable medical devices, sensors, styluses and presenters.

The nRF52805 features an Arm® Cortex®-M4 processor, clocked at 64 MHz. It has 192 KB Flash and 24 KB RAM and integrates a range of analog and digital interfaces such as a 2-channel 12-bit ADC, SPI, UART, and TWI.

The nRF52805 is a Bluetooth 5.2 SoC supporting Bluetooth Low Energy and 2.4 GHz proprietary protocols. It is capable of Bluetooth high-throughput 2 Mbps, transferring data faster and more efficient, and Bluetooth channel selection algorithm #2 (CSA #2), improving coexistence and reducing interference. It also supports 2.4 GHz proprietary protocols. The radio has up to 4 dBm TX power and -97 dBm sensitivity (1 Mbps Bluetooth LE).

The nRF52805 is available in our smallest package, a 2.48×2.46 mm WLCSP, optimized for two-layer PCB designs. This enables designs that are small and low cost, attributes that are typically a design trade-off, since small designs typically require four-layer PCBs, which have significantly higher cost. We provide a 9.5×8.8 mm reference layout with all ten GPIOs available, requiring only 10 external passive components (inc. two crystal load capacitors).

The nRF52805 is supported by SoftDevice S112, and will be supported by SoftDevice S113. S112 and S113 are memory-optimized Peripheral-only Bluetooth Low Energy protocol stacks supporting up to 4 connections as a Peripheral concurrently with a Broadcaster. A guide on how to use nRF52805 with nRF5 SDK is available here. The nRF52 DK is the recommended development kit, it emulates the nRF52805, and can be used as a starting point for development before moving over to a custom board.

 Features:

  • 64 MHz Arm Cortex-M4
  • 192 KB Flash + 24 KB RAM
  • Bluetooth Low Energy
    • Bluetooth 5.2
    • High-throughput 2 Mbps
    • Channel selection algorithm #2
  • 2.4 GHz proprietary protocol support
  • Ultra-low-power 2.4 GHz multiprotocol radio
    • +4 dBm TX power
    • -97 dBm RX sensitivity
    • 4.6 mA in TX (0 dBm)
    • 4.6 mA in RX (1 Mbps)
    • Integrated balun with single-ended output
  • SPI, TWI, UART
  • 2-channel 12-bit ADC
  • Integrated DC/DC regulator
  • 0.3 µA in System OFF
  • 1.1 µA in System ON with 24 KB RAM retained and RTC running
  • Optimized for small two-layer PCB designs
    • 2.48×2.46 mm WLCSP package
    • Significanly lower cost than four-layer PCB designs
    • Only 10 external passive components
    • 9.5×8.8 mm reference layout is available, giving access to all 10 GPIOs

Product Brief

Interested? Email us at [email protected]

Information extracted from nordicsemi.com (link)

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