PCA9420 datasheet(42/87 Pages) NXP

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NXP Semiconductors

PCA9420

Power management IC for low-power microcontroller applications

Bit

Symbol

Default value Type

Function

NTC_RES_SEL

R/W

External thermistor typical resistance selection (NTC thermistor bias

current selection)

0: 100 kΩ (I = 5 μA)

1: 10 kΩ (I = 50 μA)

TIMER_2X

R/W

Charging Safety Timer Extension

0: Both pre-qual and fast charge timer duration keeps as the values set

in ICHG_PREQ_TIMER [1:0] and ICHG_FAST_TIMER [1:0]

1: Both pre-qual and fast charge timer duration is extended to 2x of the

values set in ICHG_PREQ_TIMER [1:0] and ICHG_FAST_TIMER [1:0]

ICHG_FAST_

TIMER [1:0]

R/W

Linear battery charger fast charge timer setting

00: 3 hr

01: 5 hr

10: 7 hr

11: 9 hr

ICHG_PREQ_

TIMER [1:0]

R/W

Linear battery charger pre-qualification charge timer setting

00: 15 min

01: 30 min

10: 45 min

11: 60 min

T_TOPOFF [1:0] 01

R/W

TOPOFF Timer setting

00: 0 min

01: 6.4 min

10: 12.8 min

11: 19.2 min

Table 34. CHG_CNTL6 register bit description

9.5.21 Battery charger control_7 (CHG_CTL7, address 17h)

This register stores the present status of chip, part 7, linear battery charger related

status. This is a READ AND WRITE register.

Bit

Symbol

Default value Type

Function

7:5

NTC_BETA_SEL

[2:0]

001

R/W

Set the thermistor beta value selection (see below)

RSVD

R/W

Reserved bit

RSVD

R/W

Reserved bit

THM_REG

[2:0]

100

R/W

Thermal regulation threshold setting (see below)

Table 35. CHG_CNTL7 register bit description

000: 3434k

010: 3934k

100: 4100k

110: 4543k

001: 3610k

011: 3950k

101: 4311k

111: 4750k

Table 36. Set the thermistor beta value selection (Thermistor beta values below are defined for (25/85°C)

range)

PCA9420

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Product data sheet

Rev. 4.0 — 28 November 2022

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