Hi,
For you first question, the power rails after configuration for the PF1550A5 version of the PMIC can be found in table 83 of the datasheet starting on page 78 under the “A5” column: https://www.nxp.com/docs/en/data-sheet/PF1550.pdf
Output voltage of SWx is programmable via OTP. During startup (REGS_DISABLE mode to RUN mode), contents of the OTP_SWx_VOLT[5:0] are mapped into the SWx_VOLT[5:0], SWx_STBY_VOLT[5:0] and SWx_SLP_VOLT[5:0] register which set the regulator output voltage during Run, Standby and Sleep modes respectively.
LDO1 and LDO3 are identical 300 mA low dropout (LDO) regulators that provide output voltage with high accuracy and are programmable through I2C interface bits.
About your second question about the ON_KEY customization, by default (if not configured), pressing the switch on the ON_KEY generates interrupts to the processor and the processor uses this interrupt to initiate PMIC state transitions.
Pressing the ONKEY for longer than the delay programmed by OTP_TGRESET[1:0] (ranges from 4.0 s to 16 s), forces the PMIC into the REGS_DISABLE state.
If configured properly (ON_KEY pressed low > Tgreset && ON_KEY_RST_EN = 1), facilitates creating a hard reset when pressing the ON_KEY button without processor intervention.
Regards,
Jose
