Protocols Bluetooth low energy 5.1 Type Wireless MCU Features LE 1M PHY Peripherals 12-bit ADC 8-channel, 2 SPI, 4 timers, I2C, I2S, Sensor controller Rating Catalog Flash memory (kByte) 128 RAM (kByte) 20 Number of GPIOs 10, 15, 31 Security Crypto acceleration (RNG, Debug security, Device identity, Secure boot, Secure firmware update Sensitivity (best) (dBm) -97 Operating temperature range (°C) -