CC1310F128RSMR

CC1310F128RSMR is the compact 4x4 mm VQFN-32 (RSM) ordering code of the CC1310 Sub-1 GHz wireless microcontroller, with 128 KB of Flash and 20 KB of SRAM behind an Arm Cortex-M3 core. The trade-off of the small package is pin count: this code exposes only 10 GPIO, against 30 GPIO on the 48-pin RGZ version, so peripheral, sensor and debug connections must fit that budget. For space-constrained nodes such as compact sensors, trackers and sealed meters, the smaller footprint saves board area while keeping the same F128 memory configuration as the larger code. Selection advice: pick RSMR only after counting every required GPIO, including programming and expansion lines; if the design needs more I/O, use the RGZR code instead and plan the larger 7x7 mm footprint from the start, because migrating later means a PCB respin. Parameters verified against Texas Instruments documentation.