Receiver sensitivity and link budget
With a sensitivity of -99 dBm, the CC2541F128RHAR holds a usable link in environments where signal attenuation is a factor — think industrial sensor nodes behind metal enclosures or battery-powered beacons at the edge of a warehouse. The 0 dBm transmit output is standard for BLE; the receiver side is where the range margin comes from.
The 2 V to 3.6 V supply range lets it run directly from a coin cell or a 2 V to 3.6 V rail without a regulator.
Serial interfaces and GPIO
I²C, SPI, and USART are available for connecting external sensors, memory, or displays. The 23 GPIO lines can be mapped to these interfaces or used as general-purpose I/O for buttons, LEDs, or interrupt lines from external peripherals.
Current consumption profile
Receiving current ranges from 17.9 mA to 20.2 mA; transmitting current runs 16.8 mA to 18.2 mA. These figures are typical for a BLE SoC at 0 dBm output — the part is not the lowest-power option on the market, but it is competitive for designs that need the full Bluetooth v5.0 feature set.