nRF52805-CAAA-R Bluetooth 5.2 / 2.4GHz Wireless SoC 64MHz Cortex-M4 192KB Flash WLCSP-28

nRF52805-CAAA-R Product Overview

The nRF52805-CAAA-R is an ultra-low power Bluetooth 5.2 / 2.4GHz Wireless System-on-Chip (SoC) from Nordic Semiconductor, the 7th addition to the industry-leading nRF52 Series. Housed in a WLCSP-28 (2.5×2.5mm) wafer-level chip-scale package measuring just 2.48mm × 2.46mm, it is optimized for small two-layer PCB designs, eliminating the need for more expensive four-layer PCBs. Powered by a 64MHz Arm Cortex-M4 processor with 192KB Flash and 24KB RAM, it supports Bluetooth 5.2 and 2.4GHz proprietary protocols. With its ultra-small package, low power consumption, and cost-optimized design, it is an ideal choice for high-volume compact wireless applications including beacons, disposable medical devices, sensors, styluses, and presenters.

nRF52805-CAAA-R Key Features

64MHz Arm Cortex-M4 Processor & Memory: Features a 32-bit Arm Cortex-M4 processor running at up to 64MHz. EEMBC CoreMark score of 144 running from flash, with CoreMark power consumption of only 34.4 μA/MHz (from flash) and 32.8 μA/MHz (from RAM). 192KB Flash and 24KB RAM are sufficient for the Bluetooth protocol stack (SoftDevice) and application code. Supports Serial Wire Debug (SWD) and OTA DFU.

Bluetooth 5.2 2.4GHz Transceiver: Supports Bluetooth 5.2 with 2Mbps high bitrate, CSA #2, and concurrent multiprotocol operation. Output power of +4dBm, receiver sensitivity of -97dBm (1 Mbps Bluetooth LE mode), with a link budget of 101dBm. TX current (0dBm) only 4.6mA, RX current (1Mbps) only 4.6mA, with integrated 50Ω single-ended output balun. Supports 1 Mbps and 2 Mbps data rates.

Ultra-Low Power Design: Supports 1.7V ~ 3.6V wide supply voltage range with on-chip LDO and DC/DC regulators and automatic low-current mode. 0.3μA in System OFF mode (3V, no RAM retention), 0.5μA with full 24KB RAM retention; 1.1μA in System ON mode with RTC wake-up (3V, full 24KB RAM retention). Fast wake-up using 64MHz internal oscillator.

Rich Peripheral Interfaces: Integrated 2-channel 12-bit ADC, SPI, UART, TWI (I2C compatible), and QDEC digital interfaces. Provides 10 GPIO pins. Supports AES HW encryption, RTC, and single crystal operation.

WLCSP-28 Ultra-Small Package Optimized for Two-Layer PCB: WLCSP-28 (2.5×2.5mm) wafer-level chip-scale package measuring approximately 2.48mm × 2.46mm. Optimized for small two-layer PCB designs, with Nordic's 9.5×8.8mm reference layout requiring only 10 external passive components (including two crystal load capacitors) for complete wireless functionality. Operating temperature range of -40℃ ~ +85℃, MSL rating 2 (1 year) .

nRF52805-CAAA-R Applications

With its ultra-small package, cost-optimized two-layer PCB design, and low-power Bluetooth 5.2 connectivity, the nRF52805-CAAA-R is widely used in:

Beacons: iBeacon, Eddystone low-power Bluetooth beacon devices

Disposable Medical Devices: Ingestible diagnostic devices, disposable medical monitoring sensors

Styluses & Presenters: Smart styluses, wireless presenters, digital pens

Sensors: Low-power sensor nodes, environmental monitoring sensors

Network Processor: As a companion network processor, combining Bluetooth 5 connectivity with a more powerful main application processor

Simple CE Remotes: Low-power consumer electronics remote controls

Asset Tags & Retail Labels: Asset tracking tags, retail electronic shelf labels

Health Monitoring: Health trackers, drug delivery devices

Toys: Smart toys, interactive entertainment devices

nRF52805-CAAA-R Advantages and Highlights

The nRF52805-CAAA-R is the highly cost-effective entry-level member of the nRF52 Series SoC family. Its core advantage lies in achieving an ideal balance between ultra-small package, two-layer PCB optimization, and advanced Bluetooth 5.2 functionality.

WLCSP-28 Ultra-Small Package Optimized for Two-Layer PCB: Features a WLCSP-28 (2.5×2.5mm) wafer-level chip-scale package measuring just 2.48×2.46mm. Optimized for small two-layer PCB designs, it eliminates the need for more expensive four-layer PCBs, dramatically reducing the cost of compact designs. Nordic provides a 9.5×8.8mm reference layout with all 10 GPIOs available, requiring only 10 external passive components (including two crystal load capacitors).

Complete Bluetooth 5.2 Functionality: Supports Bluetooth 5.2 with 2Mbps high bitrate, CSA #2, and 2.4GHz proprietary protocols. The 2Mbps high bitrate increases application throughput and saves up to 50% energy consumption. CSA #2 significantly improves coexistence with other Bluetooth LE devices.

Ultra-Low Power for Battery-Powered Devices: TX and RX currents are only 4.6mA. System OFF current as low as 0.3μA, System ON with RTC only 1.1μA. Integrated DC-DC regulator with 1.7V ~ 3.6V wide supply range, ideal for battery-powered portable and disposable devices.

Complete Digital Interfaces: Integrated 2-channel 12-bit ADC, SPI, UART, TWI digital interfaces, with AES HW encryption support.

OTA Firmware Update Support: The nRF52805 and all nRF52 Series are flash-based SoCs with support for Over-the-Air Device Firmware Updates (OTA DFU) .

S112 SoftDevice Support: The nRF52805 supports S112 and S113 SoftDevice (Bluetooth 5.1 certified protocol stacks), memory-optimized Bluetooth peripheral protocol stacks supporting 2Mbps high bitrate and CSA #2.

Mature nRF5 SDK Development Ecosystem: Nordic provides a complete nRF5 SDK and SoftDevice protocol stack. Developers can use the nRF52 Development Kit (DK) to emulate the nRF52805 before moving to custom boards.

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FAQs:

1. Question: What is the NRF52805-CAAA-R?
   Answer: It is an ultra-low-power Bluetooth 5.2 SoC from Nordic Semiconductor, part of the nRF52 series, in a 2.48 x 2.46 mm WLCSP-28 package optimized for small two-layer PCBs and cost-constrained applications.

2. Question: What is the core processor and performance?
   Answer: It features a 64 MHz Arm Cortex-M4 processor with a CoreMark score of 144, consuming 34.4 μA/MHz running from Flash.

3. Question: What is the memory capacity?
   Answer: It includes 192 KB Flash and 24 KB RAM, sufficient for lightweight Bluetooth stacks and application code.

4. Question: Which wireless protocols are supported?
   Answer: It supports Bluetooth 5.2 (including 2 Mbps, CSA #2, and Long Range) and 2.4 GHz proprietary protocols.

5. Question: How is the RF performance?
   Answer: Maximum TX power is +4 dBm, RX sensitivity is -97 dBm at 1 Mbps BLE, with a link budget of approximately 101 dB.

6. Question: How is the power consumption?
   Answer: TX current is only 4.6 mA (0 dBm) or 7 mA (+4 dBm), RX current is 4.6 mA. System OFF current is 0.3 μA without RAM retention, and System ON with full 24 KB RAM retention and RTC running is 1.1 μA.

7. Question: What package and dimensions does it use?
   Answer: It uses a WLCSP-28 wafer-level package measuring only 2.48 x 2.46 mm, optimized for compact two-layer PCB designs.

8. Question: How many GPIOs and peripheral interfaces are provided?
   Answer: It offers 10 GPIOs and integrates a 2-channel 12-bit ADC, SPI, UART, and TWI (I2C) interfaces.

9. Question: Which development tools and SDKs are supported?
   Answer: The nRF52 DK is recommended for emulation and development. It supports nRF5 SDK and nRF Connect SDK, compatible with mainstream IDEs including Keil, IAR, GCC, and Segger Embedded Studio.

10. Question: What are the main application scenarios?
    Answer: It is widely used in beacons, disposable medical devices, sensors, styluses, presenters, smart home sensors, asset tags, and toys for battery-powered compact wireless devices.