PCA9420BS datasheet(36/85 Pages) NXP

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NXP Semiconductors

PCA9420

Power management IC for low-power microcontroller applications

Bit

Symbol

Default value Type

Function

CHGN_LOCK [4:0] ≠ 10101, these registers which are labeled as

“locked by CHG_LOCK” can NOT be accessed to perform I2C “write”

command. In such case when “write” command is performed on these

locked registers, it keeps the present register value.

NTC_EN

R/W

Enable TS pin external thermistor (NTC) control in charger

0: Disable Thermistor (NTC) control in charger

1: Enable Thermistor (NTC) control in charger

CHG_TIMER_EN 1

R/W

Enable the fast charge timer and pre-qual timer

0: Disable both fast charge timer and pre-qual timer

1: Enable both fast charge timer and pre-qual timer

CHG_EN

R/W

Enable the linear battery charger

0: Disable charger

1: Enable charger

Note: The default value for this bit should be MTP programmable

Table 22. CHG_CNTL0 register bit description...continued

9.5.15 Battery charger control_1 (CHG_CTL1, address 11h)

This register stores the linear battery charge related control registers, part 1.

This is a READ AND WRITE register,

and this register is locked by CHG_LOCK.

Bit

Symbol

Default value Type

Function

RSVD

R/W

Reserved bit

RSVD

R/W

Reserved bit

ICHG_CC

[5:0]

001000

R/W

Program a fast charge current

Note: The current default value for ICHG_CC [5:0] is set at 40 mA,

but it should be MTP programmable.

Table 23. CHG_CNTL1 register bit description

00h: 0 mA

10h: 80 mA

20h: 160 mA

30h: 240 mA

01h: 5 mA

11h: 85 mA

21h: 165 mA

31h: 245 mA

02h: 10 mA

12h: 90 mA

22h: 170 mA

32h: 250 mA

03h: 15 mA

13h: 95 mA

23h: 175 mA

33h: 255 mA

04h: 20 mA

14h: 100 mA

24h: 180 mA

34h: 260 mA

05h: 25 mA

15h: 105 mA

25h: 185 mA

35h: 265 mA

06h: 30 mA

16h: 110 mA

26h: 190 mA

36h: 270 mA

07h: 35 mA

17h: 115 mA

27h: 195 mA

37h: 275 mA

08h: 40 mA

(default)

18h: 120 mA

28h: 200 mA

38h: 280 mA

Table 24. Linear battery charger constant current (CC) setting

PCA9420

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Product data sheet

Rev. 4.2 — 26 July 2023

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