MPF5023AMBA0ES datasheet(21/91 Pages) NXP

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NXP Semiconductors

PF5023

Power management integrated circuit (PMIC) for high performance applications

PF5023

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Product data sheet

Rev. 1 — 15 April 2020

21 / 91

Table 18. Power up sequence registers

OTP bits

OTP_SWx_SEQ[7:0]/

OTP_PGOOD_SEQ[7:0]/

OTP_RESETBMCU_SEQ[7:0]

Functional bits

SWx_SEQ[7:0]/

PGOOD_SEQ[7:0]/

RESETBMCU_SEQ[7:0]

Sequence slot

Startup time

(µs)

00000000

Off

00000001

SLOT0

(right after PWRON event is

valid)

00000010

SEQ_TBASE x SLOT1

11111111

254

SEQ_TBASE x SLOT254

If RESETBMCU is not programmed in the OTP sequence, it will be enabled by default

after the last regulator programmed in the power up sequence.

When the _SEQ[7:0] bits of all regulators and PGOOD used as a GPIO are set to 0x00

(OFF) and a power on event is present, the device moves to the run state in slave mode.

In this mode, the device is enabled without any voltage regulator or GPO enabled. If the

RESETBMCU is not programed in a power up sequence slot, it is released when the

device enters the run state.

The slave mode is a special case of the power up sequence to address the scenario

where the PF5023 is working as a slave PMIC, and supplies are meant to be enabled

by the MCU during the system operation. In this scenario, if RESETBMCU is used, it is

connected to the master RESETBMCU pin.

Figure 8 provides an example of the power up/down sequence coming from the Off

modes.

aaa-032747

System On

End of

PWRUP

End of

PWRDN

Power down Seq.

Run to Off

Power up Seq.

Off to Run

INTB

SW2

SW3

SW1

RESETBMCU

Start of

PWRDN

Figure 8. Power up/down sequence between Off and system On state

When transitioning from Standby mode to Run mode, the power up sequencer is

activated only if any of the external regulators is re-enabled during this transition. If none

of the regulators toggle from Off to On and only voltage changes are being performed

when entering or exiting Standby mode, the changes for the voltage regulators are made

simultaneously rather than going through the power up sequencer.

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