nRF52805 Bluetooth 5.2 SoC features a WLSCP, enhanced for small two layer PCB models

Nordic Semiconductor has announced the nRF52805, which is a microcontroller from the NRF52 series of microcontrollers. Measuring at just 2.48 x 2.46mm, the nRF52805 is the smallest of all the nRF52 series. Despite its small size, the nRF52805 System-on-Chip (SoC) top up the industry-leading Nrf52 Series with an SoC in a WLCSP enhanced for small two layer PCB designs, ideal for cost-constrained utility. The nRF52805 is the perfect alternative for applications such as beacons, disposable medical devices, sensors, styluses and presenters.

The nRF52805 features an Arm® Cortex® – M4 processor, clocked at 64 MHz, equipped with a 192 KB Flash and 24KB RAM, and incorporates wide variety of analog and digital interfaces such as a 2-channel 12 bit ADC, SPI, UART and TWI. The Nrf52805 which is a Bluetooth 5.2 SoC enables Bluetooth Low Energy and 2.4 GHz proprietary protocols. It enables Bluetooth high-throughput of 2 Mbps, transmitting info faster and even more efficient, and Bluetooth channel selection algorithm #2(CSA#2), improving coexistence ad reducing interference. The radio has up to 4 decibel-milliwatts TX power and -97 dBm sensitivity (1 Mbps Bluetooth LE).

Specifications:

• 64 MHz Arm Cortex-M4
• 192 KB Flas + 24 KB RAM
• Bluetooth Low Energy
  • Bluetooth 5.2
  • High-throughput 2 Mbps
  • Channel selection algothrithm #2
• 2.4 GHz proprietary protocol support support
• Ultra-low-power 2.4 GHz multiprotocol radio
  • +4 dBm TX power
  • -97 dBm RX sensitivity
  • 7 mAin TX (4 dBm)
  • 4.6 mA in TX ( 0 dBm)
  • 4.6 Ma in RX (1 Mbps)
  • Integrated balun with single-ended output
• SPI, TW, UART
• 2-channel 12-bit ADC
• Integradted 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 x 2.46 mm WLSCP package
  • Significantly lower cost than four-layer PCB designs
  • Only 10 external passive components
  • 9.5×8.8 mm reference  layout design is accessible giving access to all 10 GPIOs

About the Nrf52805 size, Nordic Semiconductor says:

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

The Nrf52805 is compatible with SoftDevice S112, and will also be supported by SoftDevice S113. S112 & S113 are memory-optimized Peripheral only Bluetooth Low Energy protocol stacks supporting up to 4 connections as a Peripheral at the same time with a Broadcaster.

Nordic Semiconductor has provided a guide on how to use nRF52805 with nRF5 SDK, and you can find it here. Nordic Semiconductor recommends you use nRF52 DK development kit, since it emulates the nRF52805, and it can be used as a starting point for development before moving over to a custom board. More information about the Nrf52805 can be found on Nordic Semiconductor’s website.

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