PCA9421 datasheet(20/66 Pages) NXP

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NXP Semiconductors

PCA9421

Power management IC for low-power microcontroller applications

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 is latched and only its first occurrence triggers the interrupt signal INTB (if it is not being masked).

Reoccurring events do not change the flag's status or trigger an additional interrupt. If multiple interrupt events

happen, its corresponding interrupt bits in the related registers are “triggered”, however, the INTB signal is 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) buck regulator block; (3) 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 only change back to 0 when all the interrupt events in its affiliated mode are cleared.

This is READ Only register.

Bit

Symbol

Default value

Type

Function

RSVD

Reserved bit

RSVD

Reserved bit

RSVD

Reserved bit

RSVD

Reserved bit

SYS_INT

System level interrupt event trigger indication from events reflected on

Sub level interrupt_0 register.

0: no system level interrupt event triggered

1: system level interrupt event triggered

VIN_INT

VIN_INT interrupt event trigger indication

0: no VIN_AUX_OK or VIN_ILIM interrupt event triggered

1: VIN_AUX_OK or VIN_ILIM interrupt event triggered

Table 10. TOP_INT register bit description

PCA9421

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

Product data sheet

Rev. 1.0 — 16 October 2023

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