NRF52840-CKAA-R7 WLCSP-93 Bluetooth 5.0 2.4GHz Low Power Wireless SoC Chip

NRF52840-CKAA-R7 Product Overview

NRF52840-CKAA-R7 is a high-performance multi-protocol wireless SoC of Nordic nRF52 series in WLCSP-93 wafer level package. It integrates ARM Cortex-M4F core with FPU, supporting Bluetooth 5.0, BLE, ANT, Thread and proprietary 2.4G protocols. It delivers strong computing and RF performance for compact high-end IoT wireless devices.

NRF52840-CKAA-R7 Key Features

ARM Cortex-M4 Processor @ 64MHz: Features an ARM® Cortex™-M4 32-bit processor with FPU running at 64MHz. EEMBC CoreMark score of 212 running from flash, with power consumption of only 52 μA/MHz. Supports Watchpoint and Trace debug modules (DWT, ETM, and ITM) and Serial Wire Debug (SWD) .

Large Memory: 1MB Flash and 256KB RAM, providing ample storage for complex applications, concurrent multiprotocol stacks, and OTA firmware upgrades.

Multiprotocol Wireless: Supports Bluetooth 5 (LE) , Bluetooth Mesh, Thread, Zigbee, ANT, and 2.4GHz proprietary protocols. Data rates: Bluetooth 5 — 2 Mbps, 1 Mbps, 500 kbps, and 125 kbps; IEEE 802.15.4-2006 — 250 kbps; proprietary 2.4 GHz — 2 Mbps, 1 Mbps. Receiver sensitivity of -95 dBm (1 Mbps BLE mode) and -103 dBm (125 kbps long-range mode). TX power from -20 to +8 dBm in 4 dB steps. On-air compatible with nRF52, nRF51, nRF24L, and nRF24AP series devices.

Ultra-Low Power: RX current of 4.6 mA, TX current of 4.8 mA, with RX current ranging from 3.7 mA to 11.1 mA and TX current from 2.3 mA to 32.7 mA. Supports 1.7V to 5.5V wide supply voltage range with integrated DC-DC regulator.

Comprehensive Security: Integrated Arm TrustZone CryptoCell 310 security subsystem. Supports NIST SP800-90A and SP800-90B compliant random number generator. Supports AES-128-ECB, CBC, CMAC/CBC-MAC, CTR, CCM/CCM*. Supports ChaCha20/Poly1305 AEAD with 128- and 256-bit key sizes. Supports SHA-1 and SHA-2 up to 256-bit. Supports HMAC. Supports RSA up to 2048-bit and SRP up to 3072-bit. Supports ECC for P-256 (secp256r1) and Ed25519/Curve25519.

Rich Interfaces & Peripherals: 48 GPIOs. Serial interfaces include ADC, I2S, PDM, PWM, SPI, UART, and USB. Supports QSPI interface.

WLCSP-93 Ultra-Small Package: WLCSP-93 (3.5×3.6mm) wafer-level chip-scale package measuring just 3.607mm × 3.544mm with 0.33mm height. Operating temperature range of -40℃ ~ +85℃.

NRF52840-CKAA-R7 Applications

With its multiprotocol wireless capability, Cortex-M4 performance, and ultra-small WLCSP package, the nRF52840-CKAA-R7 is widely used in:

Wearable Devices: Smart watches, bands, fitness trackers, AR/VR devices

Smart Home & Matter Devices: Matter over Thread support for smart lighting, smart locks, sensor nodes

Thread/Zigbee IoT Nodes: Thread 1.3 and Zigbee 3.0 support for low-power mesh networks

Medical Devices: Portable medical monitors, health trackers, smart thermometers

Advanced Computer Peripherals & I/O Devices: Wireless mice, keyboards, presenters

Industrial Automation & Control: Industrial sensors, equipment monitoring, remote data acquisition

Interactive Entertainment Devices: Game controllers, remote controls, smart toys

Beacons: iBeacon and other BLE beacon devices

General Low-Power IoT Sensor Hubs & Data Loggers

NRF52840-CKAA-R7 Advantages and Highlights

The nRF52840-CKAA-R7 is the WLCSP package variant of the nRF52840 series. Its core advantage lies in compressing the full nRF52840 feature set into an ultra-compact 3.5×3.6mm footprint. Compared to the AQFN-73 package variant, the WLCSP-93 package reduces the footprint by approximately 75%, making it ideal for extremely space-constrained wearables and portable products.

WLCSP-93 Ultra-Small Package for Space-Constrained Applications: Features a 3.5×3.6mm WLCSP package with only 0.33mm height, the smallest package option in the nRF52840 family. Ideal for smart rings, smart earbuds, medical patches, and other extremely space-constrained products.

Complete nRF52840 Feature Set: Despite the dramatically reduced package size, the nRF52840-CKAA-R7 retains the full functionality of the nRF52840, including 1MB Flash, 256KB RAM, Cortex-M4 processor, complete Bluetooth 5/Thread/Zigbee multiprotocol stacks, and Arm TrustZone CryptoCell 310 security subsystem.

Multiprotocol Wireless, One Chip for Multiple Uses: Supports Bluetooth 5, Bluetooth Mesh, Thread, Zigbee, ANT, and 2.4GHz proprietary protocols, on-air compatible with nRF52, nRF51, nRF24L, and nRF24AP series devices. One chip meets multiple wireless protocol needs, suitable for Matter, Thread, and other emerging IoT standards.

Ultra-Low Power for Battery-Powered Devices: RX current of 4.6 mA, TX current of 4.8 mA, supporting 1.7V to 5.5V wide supply voltage range with integrated DC-DC regulator.

Comprehensive Hardware Security: Integrated Arm TrustZone CryptoCell 310 security subsystem supporting AES, ChaCha20/Poly1305, SHA, HMAC, RSA, and ECC algorithms, meeting the stringent requirements for data security and device identity authentication in IoT applications.

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FAQs:

1. Question: What is the NRF52840-CKAA-R7?
   Answer: It is a flagship multiprotocol wireless SoC from Nordic Semiconductor in a WLCSP-93 wafer-level package, integrating an ARM Cortex-M4 processor and supporting Bluetooth 5, Thread, Zigbee, and 2.4GHz proprietary protocols.

2. Question: What is the core processor and frequency?
   Answer: It features an ARM Cortex-M4 32-bit processor with FPU running at 64 MHz, achieving an EEMBC CoreMark score of 212 when running from Flash.

3. Question: Which wireless protocols does it support?
   Answer: It supports Bluetooth 5 (including 2 Mbps high-speed and 125 kbps long-range modes), IEEE 802.15.4-2006 (Thread and Zigbee), and 2.4GHz proprietary protocols, with on-air compatibility with nRF52, nRF51, and nRF24L series.

4. Question: What is the memory capacity?
   Answer: It includes 1 MB of Flash program memory and 256 kB of RAM, sufficient for complex protocol stacks and multitasking applications.

5. Question: How is the RF performance?
   Answer: Transmit power is configurable from -20 to +8 dBm in 4 dB steps. Sensitivity is -95 dBm at 1 Mbps BLE and reaches -103 dBm in 125 kbps long-range mode.

6. Question: What package and dimensions does it use?
   Answer: It uses a WLCSP-93 wafer-level chip-scale package measuring only 3.54 × 3.61 mm, an ultra-miniature form factor ideal for extremely space-constrained designs.

7. Question: What are the operating voltage and temperature ranges?
   Answer: The supply voltage range is 1.7V to 5.5V, and the operating temperature range covers the industrial standard from -40°C to +85°C.

8. Question: How many GPIOs and peripheral interfaces are provided?
   Answer: It offers 48 general-purpose I/O pins and integrates ADC, I²S, PDM, PWM, SPI, UART, and USB peripherals with EasyDMA automatic data transfer support.

9. Question: What hardware security features does it have?
   Answer: It integrates the ARM TrustZone CryptoCell 310 security subsystem, supporting AES-128/256, ChaCha20/Poly1305, SHA-1/SHA-256, and a random number generator compliant with NIST SP800-90A/B.

10. Question: What are the PCB design considerations for the WLCSP package?
    Answer: The WLCSP package has an extremely fine pin pitch, requiring high-precision pad openings and microvia fanout. Place 1μF ceramic decoupling capacitors near VDD pins, maintain 50-ohm impedance matching for RF traces, and note the package's sensitivity to mechanical stress.