We are developing a low-cost board using the i.MX6UL Processor and no specific PMIC devices (such as the PF3000). The processor should start its operation when the supply is "plugged in", the user cannot start nor stop the application.
This leads me to the following question:
The i.MX6 has a PMM residing in the SNVS_LO domain offering nice features like the ONOFF or PMIC_ON_REQU pin. These are, however, not interesting in our application (als the SOC is not to be powered up nor down by the user). Thus, is it safe (regarding to cross-currents or internal signals of the i.MX6) to ignore the function of the PMM (and with it the ONOFF pin and the PMIC_ON_REQU) and just power up all i.MX6 rails in the correct order (SNVS -> VDD_HIGH -> VDD_SOC)?
Thank you for your help,