Bluetooth 5.0 wireless MCU with 5 dBm TX headroom
The Texas Instruments CC2640R2FRSMR is a SimpleLink wireless MCU that integrates a Bluetooth v5.0-compliant radio with a 32-bit ARM Cortex-M3 core. It carries 128 KB of Flash and 28 KB of SRAM, enough to run a BLE 5.0 stack plus a modest application layer without external memory. The radio delivers a 5 dBm output power and a -103 dBm receiver sensitivity, giving a real link-budget advantage over 0 dBm parts for range-critical designs like asset trackers or building-automation sensors.
Supply range, current draw, and temperature grade
Receiving current is 5.9 mA; transmitting at 5 dBm draws 9.1 mA.
Peripheral set and GPIO count
Ten GPIOs are brought out, along with serial interfaces I²C, I²S, SPI, and UART. That is enough for a sensor hub with an external flash or a MEMS sensor plus a host UART, but tight if you need parallel LCD or many discrete I/Os. The GFSK modulation is standard BLE; no proprietary modes are exposed here.
The CC2640R2F base number shares the same package and pinout across the RSM package variants, so a shift to a sibling density option is straightforward if firmware size changes.