For proper operation of the CC3120R device, perform the recommended power-up sequencing as follows:
- Tie VBAT (pins 37, 39, 44) and VIO (pins 54 and 10) together on the board.
- Hold the RESET pin low while the supplies are ramping up. TI recommends using a simple RC circuit (100 K ||, 1 µF, RC = 100 ms).
- For an external RTC, ensure that the clock is stable before RESET is deasserted (high).
For timing diagrams, see Section 8.14.3.