Features:

• 32-bit ARM® Cortex™-M4F 64MHz

• 2.4GHz multi-protocol transceiver    
  Data rates: 1Mbps, 2Mbps Bluetooth low energy    mode (Bluetooth 5 compatible)    
  Sensitivity of -96 dbm for Bluetooth low energy

• 512kB flash, 64kB RAM

• Flexible power management , DC/DC power mode    Wide supply voltage range: LDO (1.7 to 3.6V),    Buck DC/DC (1.7 to 3.6V)

• Flexible and configurable 24 GPIO

• Ultra low-power 32kHz crystal and RC oscillators

• Peripheral 12-bit/200KSPS ADC, Temperature    sensor

• Digital I/O    
  SPI Master/Slave, 2-wire Master/Slave    
  UART (CTS/RTS) with Easy DMA

• AES HW encryption

• Quadrature Decoder (QDEC)