Bluetooth 5.1 wireless MCU with 128 KB Flash
The Texas Instruments CC2640R2FRGZT is a single-chip Bluetooth 5.1 wireless MCU from the SimpleLink family, integrating a 2.4 GHz transceiver with an ARM Cortex-M3 application processor. It carries 128 KB of Flash and 20 KB of RAM, enough for a BLE stack plus a modest application profile — think sensor nodes, beacons, or peripheral devices that don't stream audio. The -97 dBm receiver sensitivity gives a solid link budget for industrial IoT nodes where range matters, and the 5 dBm output power extends reach without needing an external PA for most indoor deployments.
5.9 mA Rx, 9.1 mA Tx — battery-life anchor numbers
The current consumption figures are the ones to size your battery around. At 5.9 mA receiving and 9.1 mA transmitting, a CR2032 can run a beacon advertising at a 100 ms interval for several months before drop-out. If your design pulses TX at +5 dBm, budget for the 9.1 mA peak — the 20 KB RAM handles a small GATT database and connection state without external memory.
31 GPIO and serial interfaces for sensor aggregation
Thirty-one GPIO pins in the 48-VQFN package give room for multiple sensors, buttons, LEDs, and a display segment. The I²C, I²S, SPI, and UART interfaces let you hang a MEMS accelerometer, a digital microphone, and an external Flash chip on the same bus without a mux.
The operating temperature range covers outdoor enclosures, factory floor, and cold-chain loggers. No AEC-Q100 rating here, so it's not for under-hood automotive, but it's fine for building automation, HVAC controls, and agricultural sensors that sit in a weatherproof box. The 2 Mbps data rate leaves headroom for firmware OTA updates over BLE without keeping the radio on for minutes.
No last-time-buy window to worry about, and the SimpleLink SDK continues to receive updates. For high-volume production, order the tape-and-reel variant; engineering samples and small builds can use the cut-tape option.