NRF52820-QDAA-R7

The NRF52820-QDAA-R7 is Nordic Semiconductor’s nRF52 family system-on-chip (SoC) designed for Bluetooth Low Energy and 2.4 GHz wireless applications. It combines a 32‑bit MCU with a 2.4 GHz transceiver, enabling BLE and other 2.4 GHz protocols in a single device.
Key points:
- Core: ARM Cortex-M4F MCU with a rich peripheral set for sensing, control, and communication.
- Wireless: Integrated 2.4 GHz transceiver (BLE and proprietary 2.4 GHz protocols).
- Memory and peripherals: On‑chip flash, RAM, and common interfaces (SPI, I2C, UART, PWM, ADC, timers, etc.).
- Security: Hardware-based cryptography and RNG features to support secure wireless communication.
- Package/variant: NRF52820-QDAA-R7 denotes a specific package/revision code from Nordic; refer to the datasheet for exact package size and temperature grade.
- Typical uses: Wearables, beacons, wireless sensors, remotes, and similar low-power BLE devices.
- Tools: Supported by Nordic’s nRF Connect SDK and SoftDevice BLE stacks for development.
For exact specifications (CPU speed, memory, available peripherals, and package details), consult the nRF52820 datasheet and product specification.

Key features of the nRF52820-QDAA-R7 (Nordic nRF52 family):
- 64 MHz ARM Cortex-M4F microcontroller with floating-point unit
- 2.4 GHz multi-protocol radio: Bluetooth Low Energy, ANT, and IEEE 802.15.4
- On-chip flash and RAM (sizes vary by package; typically suitable for BLE/IoT apps)
- Rich peripheral set: GPIOs plus UART, SPI, I2C (TWI), QSPI, PWM, timers, and ADC
- Peripheral interconnect: DPPI/PPI and GPIOTE for efficient event-driven design
- Security features: cryptography engine, RNG, and support for secure boot/flash protection
- Low power design with multiple power modes and efficient power management
- Debug and development: SWD/JTAG support
- Package: QFN/QDAA variant suitable for compact IoT wearables and beacons
- Suitable for IoT/sensor/beacon applications requiring multiprotocol wireless and low power
Note: Exact memory sizes and some protocol features may vary by specific SKU/package; refer to the official datasheet for precise specs.

The nRF52820‑QDAA‑R7 is supplied in a 32‑pin QFN (QDAA) package — a compact 5.0 × 5.0 mm QFN with 0.5 mm pin pitch.

- Pin count: 48 pins (QDAA 7×7 QFN package).
- Key pin functions (multiplexed):
- Power/Ground: VDD, VDDH (if used), GND, VDDIO, VREG, VDDF (power management)
- Reset and debug: RESET, SWDIO, SWCLK (SWD debug/programming)
- RF: ANT (single-ended antenna pin)
- GPIOs: up to ~30–32 programmable general-purpose I/Os (multiplexed)
- Serial interfaces: UART, SPI (Master/Slave), TWI/I2C
- Analog: SAADC inputs (ADC), VREF
- Timers/counters, PWM, PDM (digital microphone interface)
- Clocks: 32.768 kHz LFXO pins, high-frequency crystal/clock pins (HFCLK)
- Peripherals: RTC, RNG, DPPI/EASYDMA interconnect signals
- Optional NFC pins on supported variants
For the complete, exact pin-by-pin assignment and electrical details, refer to the nRF52820 product specification and the QDAA package pinout in the official Nordic Semiconductor datasheet.

Manufacturer: Nordic Semiconductor ASA.
What kind of company: A Norwegian fabless semiconductor company that designs and sells low-power wireless system-on-chips and connectivity solutions for IoT (notably Bluetooth Low Energy/BLE, Bluetooth 5.x, Thread, Zigbee, ANT, NFC). They create SoCs, software stacks, development tools and reference designs and outsource chip fabrication.

- Wearables and health/fitness devices (BLE)
- Beacons, asset tracking and indoor positioning
- Smart home and IoT sensors/controllers
- Industrial wireless sensors and remote controls
- Wireless consumer electronics (toys, LED controllers, remotes)