For proper operation of the CC3235x device, perform the recommended power-up sequencing as follows:
- Tie the following pins together on the board:
- VBAT (pins 37, 39, and 44)
- VIO (pins 54 and 10)
- Hold the RESET pin low while the supplies are ramping up. TI recommends using a simple RC circuit (100K ||, 0.01µF, RC = 1ms).
- For an external RTC, ensure that the clock is stable before RESET is deasserted (high).
For timing diagrams, see Section 7.17.3.