PCA9420 datasheet(9/87 Pages) NXP

9 / 87 page

NXP Semiconductors

PCA9420

Power management IC for low-power microcontroller applications

8 Functional description

8.1 Power control state diagram

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ON long press

debounce done

SHIP

SHIP_EN=1

VIN plugin event

ON falling edge

Initial powerup OR

ASYS_UVLO deasserted

Software Reset (I2C)

MODE_0 (default)

MODE_1

MODE_3

ON states

NO POWER

DEFAULT REGUL ATOR

POWERUP SEQUENCE

MODE_2

INTERNAL PMIC INIT

STANDBY

REGULATOR

POWERDOWN

SEQUENCE

PWR_DN_EN=1

ON falling edge

PROGRAMMED REGULATOR

POWERUP SEQUENCE

CHARGE ONLY

REGULATOR

POWERDOWN

SEQUENCE

SHIP_EN=1 AND

VIN present AND

ON=1 AND

OPERATION_SEL_FROM_SHIPMODE=1

VIN unplugged OR

charging done OR

thermal shutdown

else

ON falling edge

THERM_SHDN

Thermal shutdown

from any state or

sequence other than

SHIP or CHARGE_ONLY

overtemp condition

deasserted

ON falling edge AND

ON_CFG_*=0

REGULATOR

SHUTDOWN

Watchdog timer

expired

REGULATOR

SHUTDOWN

REGULATOR

SHUTDOWN

20 ms

discharge

20 ms

discharge

Figure 6. Power control state diagram

PCA9420

All information provided in this document is subject to legal disclaimers.

Product data sheet

Rev. 4.0 — 28 November 2022

9 / 87

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