Introduction

SuperMini NRF52840 is a Pro Micro alternative development board that is compatible with Nice! Nano. Its pins are the same as ProMicro, which means it can be used with almost any ProMicro keyboard. The NRF5280 development board has a 3.7V lithium battery interface and a software switch that can cut off the power of the LED. When turned off, the standby power consumption can reach 1mA.

Hardware description

nRF52840 is a high-performance, low-power wireless SoC chip launched by Norwegian Nordic Semiconductor. It supports multiple wireless protocols, including Bluetooth 5, Thread, Zigbee, ANT, and 2.4GHz. The nRF52840 chip uses an ARM Cortex-M4F processor, clocked at 64MHz, with built-in 1MB of flash memory and 256KB of RAM. It also has a variety of peripherals, including ADC, PWM, SPI, I2C, UART, USB and GPIO, etc. In addition, nRF52840 also supports a variety of security functions, such as AES encryption, SHA-256 hashing and True Random Number Generator (TRNG).

Product Parameters

Powerful wireless capabilities: Bluetooth 5.0, onboard antennaPowerful CPU: nRF52840 chip uses ARM Cortex-M4F processor, clocked at 64MHz, built-in 1MB flash memory and 256KB RAMBattery charging chip: supports lithium battery charging and dischargingPower consumption: standby power consumption can reach 1mA

Pin Diagram

Dimensions

Power Supply

SuperMini NRF52840 supports charging and discharging of 3.7V lithium battery. The charging rate is 100mA during charging, so a 2000mAh battery takes 20 hours to be fully charged.

Recharging Current

warnWhen BOOST is connected, the charging current increases from 100ma to 300ma, and it can only be connected when the capacitor capacity is greater than 500mAh (to avoid explosion💥).

External Battery

If you need an external battery, you only need to connect the + stage of the battery to B+ and the negative stage to B-. The external lithium battery only supports 3.7V and the charging rate is 100mA (a 2000mAh battery takes 20 hours to be fully charged).NoticeWhen welding, please be careful not to short-circuit the positive and negative poles, which may burn the battery and equipment.

External VCC control

hintWhen P0.13 is set to low, the power supply to the 3.3V, VCC pin will be turned off. This is useful for reducing components that use power when idle (e.g. RGB, LEDs).

Bootloader

If you want to enter Bootloder, please short RST to GND twice within 0.5S. Enter Bootloder, connect to the computer via USB, and a storage device called Nice! Nano will be displayed. At this point you can drag in the .uf2 file to burn the program.

Shipping List

• Supermini NRF52840 Board *1