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TIDA-00374 vs TIDA-00484

Other Parts Discussed in Thread: TIDA-00484, TIDA-00374, TPL5111, TPL5110

The reference designs TIDA-00374 and TIDA-00484 utilize BLE and sub-1GHz radios, respectively. The 484 design also uses additional boost converter and different system timer and load switch chips. Does anyone know the reason for the different selections? It looks like 484 has improved battery life and stability.