MPF0900AMBA2ES datasheet(79/205 Pages) NXP

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NXP Semiconductors

PF09

Nine-channel power management IC with advanced system safety monitoring

12.8.10.2 LDO1EN mode

When the GPIO2 is operating in LDO1EN mode, the GPIO2 pin is used as an input to enable or disable the

output voltage of LDO1 by hardware. In this mode of operation, the pin is provided with an internal pulldown

resistor to force a solid low condition in the event of a floating pin.

The LDO1EN mode is designed to allow the system to control the on/off status of the LDO1 regulator either by

forcing the GPIO2 pin high or low (hardware control) or by using the corresponding I2C bits to enable or disable

the regulator in RUN or STANDBY states respectively (software control).

GPIO2 operation

LDO1_RUN_EN/ LDO1_STBY_EN

GPIO2 pin

LDO1 output

LDO1EN input

Do not care

Disabled

LDO1EN input

Low

Disabled

LDO1EN input

High

Enabled

Table 90. LDO1EN mode

In order to prevent an undetected transition of the LDO1 via the LDO1EN, the device will generate the

LDO1EN_I interrupt every time the LDO1EN input toggles.

12.8.11 GPIO3

The GPIO3 pin is a programmable general-purpose IO with a selectable open-drain or push-pull output buffer.

The GPIO pin is configurable as a general purpose output (GPO) or as a dedicated input, to perform the

ERRMON fault monitoring operation via the OTP_GPIO3_MODE[1:0] bits.

OTP_GPIO3_MODE[1:0]

GPIO3 mode

Open-drain output

Push-pull output

Reserved

ERRMON input

Table 91. GPIO3 mode

Refer to section 18.6 External Error monitoring (ERRMON) for a detailed description of the ERRMON operation.

The GPIO3_S flag is provided to read the real-time state of the GPIO3 pin regardless of whether the I/O is

working as an input or an output.

GPIO3_S

GPIO3 state

Low

High

Table 92. GPIO3 state

12.8.11.1 GPO mode

When the GPIO3 is used as a general purpose output (GPO mode), the pin will be asserted low during the OFF

states. It can be set high by default during the Power-up sequence, or manually during the system-on states.

When the output is set as an open drain, the GPIO3 pin can be pulled up to any voltage lower than VIN with an

external resistor between 10 kΩ and 470 kΩ. System requirements must be taken into account when selecting

the pullup voltage and resistance. To prevent the output from being pulled high in the ULPOFF state, the

selection must ensure that the pullup voltage is not present during OFF condtions.

PF09

All information provided in this document is subject to legal disclaimers.

Product data sheet

Rev. 1.3 — 16 December 2025

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