PCA9420 datasheet(34/87 Pages) NXP

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NXP Semiconductors

PCA9420

Power management IC for low-power microcontroller applications

Bit

Symbol

Default

value

Type

Function

ASYS_PREWARNING

[1:0]

R/W

ASYS Program a pre-warning voltage threshold on ASYS

00: 3.3 V

01: 3.4 V

10: 3.5 V

11: 3.6 V

ASYS_INPUT_SEL

[1:0]

R/W

ASYS input source selection

00: ASYS is powered by either VBAT or VIN (VIN has higher

priority over VBAT if both are presented but only when

VIN>VBAT)

01: ASYS is powered by VBAT only

10: ASYS is powered by VIN only

11: ASYS is disconnected to either VBAT or VIN (for internal

testing purpose only)

RSVD

R/W

Reserved bit

VIN_OVP_SEL

R/W

VIN over-voltage protection threshold (rising) selection

0: 5.50 V

1: 6.0 V

Note: The current default value for VIN_OVP_SEL is set

at 5.5 V, but it should be MTP programmable

VIN_UVLO_SEL

[1:0]

R/W

Program an under-voltage lockout threshold (falling) on VIN

00: 2.9 V

01: 3.1 V

10: 3.3 V

11: 3.5 V

Table 18. TOP_CNTL1 register bit description

9.5.11 Top level control_2 (TOP_CTL2, address 0Bh)

This register contains various configuration bits for top level related functions, part 2. This

is a READ AND WRITE register.

Bit

Symbol

Default value

Type

Function

ASYS_UVLO_SEL

[1:0]

R/W

Program a UVLO threshold on ASYS

00: 2.4 V

01: 2.5 V

10: 2.6 V

11: 2.7 V

RSVD

R/W

Reserved bit

Table 19. TOP_CNTL2 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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