MPF0900AMBA2ES datasheet(71/205 Pages) NXP

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NXP Semiconductors

PF09

Nine-channel power management IC with advanced system safety monitoring

When operating as a push-pull driver, the RSTB output-high voltage can be set internally to VDDIO or VAON via

the OTP_RSTB_MODE[1:0] bits.

When RSTB is configured as an open-drain output, the RSTB can be pulled up to VDDIO or VAON by a 10 kΩ

to 100 kΩ external resistor.

When the device is out of the SYSTEM ON states, the RSTB pin is driven low to keep the system in the RESET

condition until a Power-up sequence is generated successfully.

During the Power-up sequence, the RSTB is de-asserted in the time slot programmed by the RSTB_SEQ[7:0]

bits. The RSTB pin being released (pulled high) in the Power-up sequence is interpreted as the start of the

system-on state.

When a system power-down or hard reset event is initiated, the RSTB pin is asserted low, as indicated in the

power-down sequence.

12.8.5.1 RSTB pin diagnostic

Upon entering the system-on states, the RSTB is provided with a programmable short-detection timer to set the

maximum acceptable time before a short in the RSTB pin is considered a fault condition.

OTP_RSTB_TSHORT[1:0]

Short detection timer

Hard fault disabled

500 μs

1000 ms

8000 ms

Table 70. RSTB short-detection timer

When a RSTB short condition is detected, the device will generate a hard-fault condition and start a power-

down sequence.

When the hard fault is disabled, a short condition will not generate a hard fault event, but the condition will still

be reported to the MCU via the RSTB_FLT_I.

During the system-on states, the short-detection timer is intended to be used in two ways based on the system

needs:

When the PMIC is operating stand-alone, or no other devices are able to control the RSTB bus, the short-

detection timer is used to ensure the RSTB pin state is indeed high.

When PMIC is operating in multi-device systems, where more than one device is able to control the RSTB bus,

the short-detection timer is used to detect when another device has asserted the RSTB bus low, and starts

counting before it can consider such event as a fault condition.

The RSTB_S flag is provided to read the real-time state of the RSTB pin.

RSTB_S

RSTB state

Low

High

Table 71. State of RSTB pin

The RSTB_FLT_I interrupt is provided to notify that a short-to-high or short-to-low condition has been present

on the RSTB pin. If the RSTB_FLT_I interrupt is unmasked, the INTB pin will be driven low.

The RSTB_FLT_I bit can be cleared by writing a 1 to it.

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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