nRF52840

Nordic Semiconductor - Wikipedia
The nRF52 Series SoCs was the second short-range wireless SoCs from Nordic Semiconductor, building on their experience developing the nRF51 Series. The nRF52 series, especially the nRF52840 and nRF52833, is very successful and exists in millions of popular consumer devices in the world today, among them wireless mice, keyboards and audio devices. The popularity of Nordic's nRF52 series allows Nordic Semiconductor to maintain a 40% worldwide market share in the Bluetooth LE segment.[22]

The nRF52833 SoC features a 64 MHz ARM Cortex-M4. This SoC supports an extended temperature range of -40˚C to 105˚C. The SoC has a 1:4 RAM to Flash storage ratio (128 KB : 512 KB). Being a wireless-focused chip, the nRF52833 is equipped with an output power of +8 dBm.[23]