PCA9420BS datasheet(35/85 Pages) NXP

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NXP Semiconductors

PCA9420

Power management IC for low-power microcontroller applications

Bit

Symbol

Default value Type

Function

MODESEL1 pins. Refer to EN_MODE_SEL_BY_PIN description for

more details.

With EN_MODE_SEL_BY_PIN=0, the mode selection is determined

by the following:

[MODE1_I2C: MODE0_I2C] = 00, mode 0 setting

[MODE1_I2C: MODE0_I2C] = 01, mode 1 setting

[MODE1_I2C: MODE0_I2C] = 10, mode 2 setting

[MODE1_I2C: MODE0_I2C] = 11, mode 3 setting

SW_RST

W/C

Chip software reset bit. If user writes a “1” to this bit, it resets all other

I2C register bit to its default setting and cycles the regulator outputs,

and meanwhile, this bit clears and resets back to “0” as well.

ON_GLT_LONG

[1:0]

R/W

Program a long glitch timer on ON key

00: 4 s

01: 8 s

10: 12 s

11: 16 s

Note: 2-bit MTP should be reserved to change the default setting

Table 20. TOP_CNTL3 register bit description...continued

9.5.13 Top level control_4 (TOP_CTL4, address 0Dh)

This register contains various configuration bits for top level related functions, part 4. This is a WRITE ONLY

Bit

Symbol

Default value Type

Function

RSVD

00000

Reserved bit

WD_TIMER_CLR

[2:0]

000

Watchdog Timer Reset.

001: When written 001 to WD_TIMER_CLR [2:0], the watchdog timer

is reset.

All other values: when written to WD_TIMER_CLR [2:0], watchdog

timer remains unaffected.

Table 21. TOP_CNTL4 register bit description

9.5.14 Battery charger control_0 (CHG_CTL0, address 10h)

This register stores the linear battery charge related control registers, part 0. This is a READ AND WRITE

Bit

Symbol

Default value Type

Function

CHG_LOCK

[4:0]

00000

R/W

Critical charger related setting lock.

CHG_LOCK [4:0] = 10101, these registers which are labeled as

“locked by CHG_LOCK” can be accessed to perform I2C “write”

command.

Table 22. CHG_CNTL0 register bit description

PCA9420

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

Product data sheet

Rev. 4.2 — 26 July 2023

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