nRF52840 Chip Hardware Design Analysis
UDYTHINC TECHNOLOGY LIMITED is a leading global supplier of electronic components. With years of industry experience, we have become a trusted partner of many customers worldwide.
We specialize in distributing various electronic components, including integrated circuits (ICs), microcontrollers, memory devices, diodes, IBGT modules, capacitors, resistors, and more.
The nRF52840 is designed around an ARM Cortex-M4 CPU and floating-point unit (FPU), featuring 1MB of flash memory and 256kB of RAM. Consequently, it supports complex and demanding applications as a single-chip solution. It offers a rich set of peripherals, including NFC, USB, and multiple interface options such as Quad SPI (QSPI). In today's rapidly evolving IoT landscape, security is paramount in solution design. Nordic's nRF52840 incorporates high-end security features, including an on-chip ARM cryptographic engine and a complete AES 128-bit cryptographic suite for optimal secure performance. It demonstrates excellent application effectiveness in IoT scenarios, with dimensions of 24.8 × 15 × 2.3 mm.
Feature List
Nordic nRF52840 Embedded ARM Cortex M4F
Multi-protocol support
Bluetooth 5, ANT/ANT+, 2.4GHz proprietary protocols,
Thread, and Zigbee
Bluetooth 5: 2 Mbps, 1 Mbps, 500 kbps, 125 kbps
IEEE 802.15.4-2006: 250 kbps
Proprietary 2.4 GHz: 2 Mbps, 1 Mbps
Integrated DC-DC converter Serial Debug Interface (SWD)
Nordic SoftDevice Ready
Flash/RAM: 1MB/256KB. 48 general-purpose I/O pins
15-level low-power comparator with low-power wake-up 2 two-wire master/slave serial ports (I2C compatible)
I2S digital audio interface 12-bit/200KSPS ADC
1 QSPI serial port (32Mbps) 4 SPI master/3 SPI slave ports (8Mbps)
2 asynchronous UARTs (with CTS/RTS and DMA) 4x4 PWM channels with EasyDMA
USB 2.0 Full-Speed Controller (12 Mbps) 20-channel CPU-independent Programmable Peripheral Interface (PPI)
Quadrature Demodulator (QDEC) 128-bit AES Hardware Encryptor
5 x 32-bit, 3 x 24-bit Real-Time Clock (RTC) NFC-A Tag Interface for OOB Pairing
TX transmit power: +8dBm to -20dBm in 4 dB steps
Operating voltage: 1.7V to 5.5V
Applications
Advanced computer peripherals and I/O devices
Mice
Keyboards
Multi-touch touchpads
Premium wearables
Health/fitness sensors and monitoring devices
Wireless payment-enabled devices
Internet of Things
Smart home sensors and controllers
Industrial IoT sensors and controllers
Interactive entertainment devices
Remote controls
Game controllers
Block Diagram
The following illustrates several power supply configurations for the nRF52840
The voltage regulator can be configured in multiple ways depending on the selected power supply voltage mode (Normal/High) and regulator type option (LDO or DC/DC). The image below shows four configuration examples.
（1）：Normal voltage mode, LDO only
（2）：Normal voltage mode, DC/DC REG1 enabled
（3）：High voltage mode, LDO only
（4）：High voltage mode, DC/DC for REG0 and REG1 enabled
Schematic Design
