MPF0900AMBA2ES datasheet(160/205 Pages) NXP

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NXP Semiconductors

PF09

Nine-channel power management IC with advanced system safety monitoring

(FCCU1 pin), followed by enabling its own FCCU operation. Once the FCCU operation is enabled in both

the MCU and the PMIC, the MCU can proceed to modify the reaction of the PMIC upon an FCCU failure and

request to release the safety output (FS0B) to allow normal operation.

When the PF09 is starting up or coming from a reset condition, the FCCU0 input will be ignored while the

FCCU1 pin starts operation as an XRESET input as soon as the device enters the RUN state. Refer to section

16.8.8 FCCU1 (XRESET Mode) for a detailed description of the XRESET behavior.

In order to avoid unsafe operation, the PF09 will not allow the FS0B pin to be released when the FCCU is

operating in hybrid bistable mode until the FCCU interface is requested to switch to full FCCU mode.

Switching to full bistable mode is required, but does not constitute sufficient conditions for releasing the FS0B.

The MCU must ensure all conditions are met before requesting an FS0B release via the FS0B_RELEASE bits.

aaa-056085

FCCU_ERR0

FCCU0

FCCU config

XRESET

FCCU

FS0B only

FCCU

FS0B only

FCCU

hard reset

FCCU

hard reset

FCCU

hard reset

XRESET

PMIC detection

FCCU_LO = OK

FCCU1_HI = reset

FCCU_HI = OK

FCCU1_LO = OK

FCCU_HI = OK

FCCU1_LO = OK

FCCU_HI = OK

FCCU1_LO = OK

FCCU_HI = OK

FCCU1_LO = OK

FCCU_HI = OK

FCCU1_LO = OK

FCCU_LO = OK

FCCU1_HI = reset

PMIC status

No fault

Fault -> FS0B low

No fault

FS0B released

Fault

PMIC reset

No fault

MCU

reset phase

PMIC full bistable

high-Z

FCCU0

MCU FCCU

enabled

Set PMIC reaction

MCU behavior

PMIC behavior

FS0B release

Fault phase

MCU

reset phase

FS0B pin

RSTB pin

WDOG_ANY

FCCU1

WDOG_ANY

FCCU1

Figure 44. FCCU Hybrid bistable operation

The FCCU pins will change the operation to full bistable mode when the MCU request a transition to FCCU

mode via the SYS_CMD[7:0] = 0xB3 (XRESET to FCCU request). Once in the full bistable mode, the device will

be able to return to XRESET mode in three ways:

1. The FCCU to XRESET Request command is sent (SYS_CMD[7:0] = 0xBA): to avoid unwanted transition

out of safe operation, the FCCU to XRESET request command will take effect only after the FS0B has been

asserted LOW, either due to a fault condition or commanded by the MCU via the FS0B_RELEASE[7:0] bits.

When the FCCU to XRESET request command is sent and the FS0B is still released (HIGH), the PF09 will

ignore the request and set the BAD_CMD_I to generate an interrupt event to the system.

2. Device moves into the STBY state (Monitored or LP_STBY): When PF09 is going into any of the STBY

states, it is assumed the system is going into low-power operation without safety critical operation, therefore the

FCCU interface will be reset to the default XRESET operation (FCC0 ignored, FCCU1 = XRESET input).

During the STBY state, the FCCU1 pin will be able to detect an XRESET event as long as the XRESET input is

enabled in the STBY state (XRST_STBY_EN = 1)

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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