PCA9420 datasheet(27/87 Pages) NXP

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NXP Semiconductors

PCA9420

Power management IC for low-power microcontroller applications

Address (Hex) Register Name

Description

Type

Reset Value

(Binary)

Reset monitor

Reset reason monitor

R RO R/W

1000 0000

Table 8. Register map...continued

9.5 Register description

9.5.1 Device information (DEV_INFO, address 00h)

The device identification code stores a unique identifier for each version and/or revision

of device, so that the connected MCU recognizes it automatically.

This is a READ ONLY register.

Bit

Symbol

Default value Type

Function

DEV_ID [4]

DEV_ID [3]

DEV_ID [2]

DEV_ID [1]

DEV_ID [0]

Device ID

DEV_REV [2]

DEV_REV [1]

DEV_REV [0]

Device revision

Table 9. DEV_INFO register bit description

9.5.2 Top level interrupt status (TOP_INT, address 01h)

The top-level interrupt register contains flags indicating various top level interrupt events

as indicated below. An event will be latched and only its first occurrence triggers the

interrupt signal INTB (if it is not being masked). Reoccurring events will not change the

flag's status or trigger an additional interrupt. If multiple interrupt events happen, its

corresponding interrupt bits in the related registers will be “triggered”, however, the INTB

signal will be only triggered upon the first interrupt event.

The interrupt event reporting on the device is structured in a two-layer configuration. The

interrupt events are grouped as (1) system level; (2) charger block; (3) buck regulator

block; (4) LDO block. When any interrupt event is triggered, based on which mode it

falls into, the related bit for that mode in TOP_INT flags “1”. Any of the related bits in

TOP_INT will only change back to 0 when all the interrupt events in its affiliated mode

have been cleared.

This is READ Only register.

Bit

Symbol

Default value

Type

Function

RSVD

Reserved bit

RSVD

Reserved bit

RSVD

Reserved bit

Table 10. TOP_INT register bit description

PCA9420

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

Product data sheet

Rev. 4.0 — 28 November 2022

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