The nINT, EN_DRV and nRSTOUT pin, and the GPIO pin assigned as nRSTOUT_SoC are IO pins with dedicated functions.

The nINT pin is the open drain interrupt output pin. More description regarding the function of this pin can be found under Section 1.

The nRSTOUT pin, together with the GPIO pin assigned as nRSTOUT_SoC, are the system reset pins which can be configured as open-drain or push-pull outputs. These pins stay in the default low state until the PFSM of the TPS6594-Q1 sets the associated control bits NRSTOUT and NRSTOUT_SOC in the register map. These control bits NRSTOUT and NRSTOUT_SOC are set by the PFSM typically after the end of a power-up sequence. At the beginning of a power-down sequence, the PFSM clears these control bits NRSTOUT and NRSTOUT_SOC in order to pull-down the nRSTOUT and nRSTOUT_SoC pins before the ramp-down of the voltage rails.

The purpose of the EN_DRV pin is to indicate that the TPS6594-Q1 has entered a safe state. The EN_DRV pin has an internal 10kΩ high-side pull-up to the VCCA supply. The TPS6594-Q1 pulls this EN_DRV pin to the default low state, and releases the pull-down when the MCU sets the ENABLE_DRV bit to '1'.