MPF0900AMBA2ES datasheet(70/205 Pages) NXP

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NXP Semiconductors

PF09

Nine-channel power management IC with advanced system safety monitoring

OTP_STBY_REQ

STANDBY request window

Always open

Open on request

Table 68. STANDBY request window

When the STANDBY request window is set to “always open”, the device can transition in and out of the

STANDBY states at any time by toggling the STBY pin, as defined by the STBY_POL polarity bit.

When the STANDBY request window is set to “open on request”, the PF09 requires a STANDBY request

command to open the request window. To start a STANDBY request, the MCU must send the SYS_CMD =

0x2C via I2C communication, and it must assert the STBY pin within 20 ms while the STANDBY request window

is open.

When the STANDBY request window is set to "open on request", the system can also start a STANDBY request

via software by fixing the STBY pin to a specific voltage, sending the STANDBY request and then changing the

STBY_POL bit via I2C communication within the open window (20 ms).

If the STBY pin does not get a valid voltage within the STANDBY request window (20 ms), the PF09 will close

the window and send a BAD_CMD_I interrupt to notify the system that the STANDBY request was not fulfilled.

12.8.4 INTB

The INTB pin is an open-drain, active-low output used to notify the MCU when a specific event is present on the

PMIC. In the application, INTB is typically pulled up to VDDIO with an external 100 kΩ resistor.

The INTB pin behaves as an OR result of all unmasked interrupt signals asserted in the interrupt registers. It

will assert (i.e., be pulled low) when any of the interrupt events occur and the corresponding event is unmasked,

and it can be de-asserted only after each unmasked interrupt has been cleared by writing a “1” to the interrupt

bit.

The PF09 provides a system-level mechanism to request an interrupt pulse on demand, to test the ability of the

INTB pin to toggle high and low at any time during the system operation. When the interrupt pulse is requested,

the INTB pin will assert for 100 μs and then de-assert to its normal state.

When requesting an interrupt pulse, the system must first clear all the interrupts to ensure the INTB pin is

properly released, and then proceed to request the interrupt pulse by writing the SYS_CMD = 0x75. The MCU

can then monitor whether the pin is able to toggle high and low as expected.

Refer to Section 12.7.2 for detailed information about the events reported through the INTB pin.

12.8.5 RSTB

The RSTB pin is a programmable open-drain or push-pull, active-low output that is used to bring the processor

(and peripherals) into and out of RESET.

The OTP_RSTB_MODE[1:0] bit is provided to select the type of buffer used on the RSTB pin.

OTP_RSTB_MODE[1:0]

RSTB buffer type

Open drain

Push-pull to VDDIO

Push-pull to VAON

Open drain

Table 69. RSTB buffer type

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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