NRF51802-QFAA-R UQFN-48-EP (6x6) BLE 2.4GHz Low Power Wireless SoC Chip

NRF51802-QFAA-R Product Overview
The nRF51802-QFAA-R is a general-purpose, ultra-low power multiprotocol Bluetooth Low Energy / 2.4GHz System-on-Chip (SoC) from Nordic Semiconductor, the high cost-performance entry model in the nRF51 Series. Built around a 32-bit ARM® Cortex™-M0 processor with 256KB Flash and 16KB RAM, it is housed in a UQFN-48-EP (6×6mm) compact package with 31 GPIOs. The nRF51802-QFAA-R is a low-cost variant of the nRF51822, fully compatible in functionality with only 2dB less RX sensitivity and slightly higher peak RF currents. Featuring the S100 series SoftDevice, it supports Bluetooth Low Energy and 2.4GHz proprietary protocols (e.g., Gazell), making it an ideal choice for cost-sensitive wireless applications.

NRF51802-QFAA-R Advantages

32MHz ARM Cortex-M0 core, 256KB Flash and 32KB RAM

2.4GHz RF transceiver for BLE, +4dBm transmit power, -93dBm sensitivity

Built-in 128-bit AES hardware encryption for secure data transmission

1.8V~3.6V wide supply voltage, ultra-low sleep current

Multiple peripherals: ADC, SPI, I2C, UART, PWM, RTC

OTA firmware upgrade supported, compact UQFN48 6×6mm package

NRF51802-QFAA-R Application

With its high cost-effectiveness, low power consumption, and Bluetooth LE/2.4GHz multiprotocol support, the nRF51802-QFAA-R is widely used in:

Computer Peripherals & I/O Devices: Wireless mice, keyboards, multi-touch trackpads, presenters

Interactive Entertainment Devices: Remote controls, gaming controllers, remote control toys

Beacons: iBeacon and other Bluetooth LE beacon devices

Health/Fitness Sensors & Monitors: Smart bands, fitness trackers, health monitors

Personal Area Networks (PAN) : Low-power sensor network nodes

Medical Devices: Portable medical monitoring devices

Key Fobs & Wrist Watches: Smart key fobs, smart watch accessories

NRF51802-QFAA-R Advantages and Highlights

The core advantage of the nRF51802-QFAA-R lies in its precise positioning as a low-cost variant of the nRF51822 — maintaining fully compatible functionality, pinout, and software while achieving significant cost optimization by reducing RX sensitivity by 2dB (from -93dBm to -91dBm) and slightly increasing peak RF currents.

Fully Compatible with nRF51822, No Design Changes Required: The nRF51802-QFAA-R is fully compatible with the nRF51822 in functionality, pinout, and software. Hardware designs can directly reuse the nRF51822 PCB layout, and software runs without modification, effectively reducing the cost and risk of product upgrades and design migration.

Ultra-Low Power for Battery-Powered Devices: System OFF current as low as 0.6μA, all-blocks-IDLE ON mode current as low as 3μA, and TX current as low as 10mA (0dBm, DC/DC mode). The 1.8V to 3.6V wide supply range makes it ideal for battery-powered portable and wearable devices.

Multiprotocol Support for Broad Applications: Supports Bluetooth Low Energy and 2.4GHz proprietary protocols (e.g., Gazell), with 250 kbps, 1 Mbps, and 2 Mbps data rates. On-air compatible with the nRF24L series for easy product upgrades and protocol migration.

Rich GPIOs with Flexible Peripheral Mapping: 31 GPIOs with flexible pin mapping for SPI, I2C, UART, and other digital interfaces. The PPI system enables peripherals to interact directly without CPU intervention.

Mature Software Ecosystem: Nordic provides a complete nRF5 SDK and S100 series SoftDevice, with hundreds of useful firmware modules and examples for rapid development.

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FAQs:

1. Question: What is the NRF51802-QFAA-R chip?
   Answer: It is a multiprotocol Bluetooth Low Energy / 2.4 GHz RF System on Chip (SoC) from Nordic Semiconductor, integrating an ARM Cortex-M0 processor and supporting BLE and proprietary 2.4 GHz protocols.

2. Question: What is the core processor?
   Answer: It features a 32-bit ARM Cortex-M0 processor, consuming 275 μA/MHz when running from Flash and 150 μA/MHz when running from RAM.

3. Question: Which wireless protocols does it support?
   Answer: It supports Bluetooth Low Energy (BLE) v4.1 and Nordic's proprietary 2.4 GHz protocols (such as Gazell), with on-air compatibility with the nRF24L series.

4. Question: What is the memory capacity?
   Answer: It includes 256 kB of embedded Flash program memory and 16 kB of RAM.

5. Question: How is the RF performance?
   Answer: It supports 250 kbps, 1 Mbps, and 2 Mbps data rates. TX power ranges from -20 dBm to +4 dBm, with -91 dBm sensitivity (BLE). Peak RX current is 13 mA and peak TX current is 10.5 mA at 0 dBm.

6. Question: What low-power management modes are available?
   Answer: Supply range is 1.8V to 3.6V. Current is 0.6 μA in OFF mode (3V), 1.2 μA in OFF mode with one RAM region retained, and 3 μA in ON mode with all blocks idle.

7. Question: How many GPIOs and peripheral interfaces are provided?
   Answer: It offers 31 GPIO pins and integrates SPI Master/Slave, I2C, UART (CTS/RTS), 8/9/10-bit ADC (8 channels), low-power comparator, temperature sensor, quadrature decoder (QDEC), and AES hardware encryption.

8. Question: What package and dimensions does it use?
   Answer: It uses a UQFN-48-EP package with an exposed thermal pad, measuring 6 x 6 mm.

9. Question: What applications is this chip suitable for?
   Answer: It is widely used in computer peripherals (mice, keyboards, touchpads), interactive entertainment devices (remotes, game controllers), beacons, personal area networks (health/fitness sensors, medical devices), and smart watches.

10. Question: Which development tools and protocol stacks are supported?
    Answer: It supports the S100 series SoftDevice stack (freely downloadable), uses Serial Wire Debug (SWD), and offers on-air compatibility with the nRF24L series for easy system upgrades.