MPF0900AMBA2ES datasheet(28/205 Pages) NXP

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NXP Semiconductors

PF09

Nine-channel power management IC with advanced system safety monitoring

12 General device operation

12.1 UVDET

VIN > UVDET is a mandatory condition for the PMIC to start a power-on cycle. Once a power-on cycle is

started, the device allows full operation as long as VIN does not fall below the falling UVDET threshold.

When VIN falls below the UVDET threshold in any state after the DBGOFF state, the device moves to the Deep

Fail-safe state and waits for proper conditions to exit the DFS state.

When the VIN crosses the UVDET threshold on the rising edge, the devices will set the UVDET_FAIL flag to 1

to provide debugging information to the system. The UVDET_FAIL bit can be cleared by writing a 1 to it.

All parameters are specified at TA = -40 °C to 125 °C, unless otherwise noted. Typical values are characterized at TA = 25

°C, unless otherwise noted.

Symbol

Description

Min

Typ

Max

Unit

VUVDET_RISE

Rising UVDET

2.8

2.85

2.9

VUVDET_FALL

Falling UVDET

2.7

2.75

2.8

Table 22. UVDET electrical characteristics

12.2 VIN OV monitoring

The VIN_OV monitor is provided as a last-resort protection against a VIN supply out of range, and its main

purpose is to prevent PMIC operation with a VIN condition out of the maximum operating range of the PF09.

The VIN_OV monitoring can be enabled or disabled by default in the OTP registers via the OTP_VIN_OV_EN

bit, and the function can be disabled during the system-on states for system debugging purposes via the

VIN_OV_EN functional bit.

VIN_OV_EN

VIN OV monitor

Disabled

Enabled

Table 23. VIN_OV_EN bit

When the VIN_OV monitor is enabled, The device monitors its input voltage and is can be programmed to react

to an over-voltage as defined by the VIN_OV_SDWN bit. The default value of the VIN_OV_SDWN bit is set in

the OTP registers via the OTP_VIN_OV_SDWN bit.

VIN_OV_SDWN

VIN OV reaction

Interrupt Only

PMIC Shutdown

Table 24. VIN_OV_SDWN bit

The VIN_OV is available during the monitored system-on states (RUN and STANDBY) and also during a power-

up event to ensure the system is not started with a VIN fault condition present.

If a VIN_OV condition is present during a power-up event, the device will not allow the power-up sequence to

start, regardless of the value of the VIN_OV_SDWN, to prevent the system from starting with a potential fault

condition.

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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