PCA9420 datasheet(6/87 Pages) NXP

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NXP Semiconductors

PCA9420

Power management IC for low-power microcontroller applications

Symbol

HVQFN24

WLCSP25

Pin Type

Description

LDO1_OUT

LDO1 output. It is always-ON supply. The input supply is a

higher voltage between ASYS and VBAT_BKUP. Bypass

with a 1 µF/6.3 V ceramic capacitor.

LDO2_OUT

LDO2 output. The input supply is ASYS. Bypass with a 2.

2 µF/6.3 V ceramic capacitor.

LOGIC INPUTS

ON Pin with an internal pull-up resistor, 1 MΩ typ, to either

2.5 V or VBAT. Refer to Section 8.4 for more details.

MODESEL0

Mode selection input pin #1. Place a 10 nF/6.3 V capacitor

for noise rejection.

MODESEL1

Mode selection input pin #2. Place a 10 nF/6.3 V capacitor

for noise rejection.

LOGIC OUTPUTS

INTB

Interrupt output, Open-drain type. Place a pull-up resistor

from 20 kΩ to 220 kΩ to a system I/O supply rail.

SYSRSTn

Reset output for external MCU, Open-drain type. Place a

pull-up resistor from 20 kΩ to 220 kΩ to a system I/O supply

rail.

SERIAL I2C INTERFACE

SCL

I2C Interface clock pin. Place a pull-up resistor between

2.2 kΩ and 10 kΩ to a system I/O supply rail. If the pin is not

used, leave the pin open.

SDA

I/O

I2C Interface data pin. Place a pull-up resistor between

2.2 kΩ and 10 kΩ to a system I/O supply rail. If the pin is not

used, leave the pin open.

DEVICE GROUND

AGND1

AGND2

AGND3

Analog ground. It shall be connected to system ground

through a via. Do not connect AGND1 and AGND2 to

PGND1 or PGND2 on the top PCB layer in the system.

Exposed

Pad

Exposed pad. Connect to system ground

Table 3. Pin description...continued

P = Power, I = Input, I/O = input/output

PCA9420

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

Product data sheet

Rev. 4.0 — 28 November 2022

6 / 87

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