Single-chip BLE node with an ARM Cortex-M3 core
The Texas Instruments CC2640F128RSMR is a Bluetooth v4.1 single-chip solution that integrates a 2.4 GHz radio with an ARM Cortex-M3 MCU on the same die, part of the SimpleLink™ family. The 10 GPIOs and serial interfaces (I²C, I²S, JTAG, SPI, UART) give you enough flexibility for sensor nodes, beacons, or HID devices without needing a separate host MCU.
Active lifecycle — no end-of-life surprise
The base product number is CC2640, and the full order code CC2640F128RSMR resolves to the 32-VQFN (4x4) package variant.
Supply voltage and current — what to budget
The supply range spans 1.8 V to 3.8 V, which covers a single Li-ion cell or two alkaline cells. In receive mode the chip draws 5.9 mA to 6.1 mA; transmitting at 5 dBm output power pulls 6.1 mA to 9.1 mA. Those numbers are typical for a BLE SoC of this vintage — budget the transmit current for your battery-life calculation.
Package and footprint — 32-VQFN with exposed pad
Housed in a 32-VFQFN with an exposed thermal pad, the package measures 4x4 mm (supplier device package 32-VQFN). The pad needs a good via stitch to the ground plane to keep the junction temperature under control during continuous transmit.