PCA9421 datasheet(28/66 Pages) NXP

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NXP Semiconductors

PCA9421

Power management IC for low-power microcontroller applications

Bit

Symbol

Default value Type

Function

7:6

RSVD

Reserved bit

IN_PWR_OK

IN_PWR (input power) status, refer to IN_PWR_STATUS [1:0] for more

details

0: Input power voltages are invalid, i.e., IN_PWR_STATUS [1:0] ≠ 0b11

1: Input power voltages are valid, i.e., IN_PWR_STATUS [1:0] = 0b11

4:0

RSVD

Reserved bit

Table 22. VIN_PWR Status_0 register bit description

9.5.15 VIN_PWR Status_1 (PWR_STATUS_1, address 19h)

This register stores the present status of VIN power, part 1. This is a READ ONLY register. The status of this

Bit

Symbol

Default value Type

Function

7:6

IN_PWR_

STATUS

VIN and ASYS input power status

00: Input power is invalid. VIN < VIN_UVLO

01: Input power is invalid. ASYS < VIN_AUX + 100 mV typical, VIN >

VIN_UVLO

10: input power is invalid. VIN > VIN_OVP

11: Input power is valid. VIN > VIN_UVLO, ASYS > VIN_AUX + 100

mV typical, VIN < VIN_OVP

5:0

RSVD

Reserved bit

Table 23. VIN_PWR Status_1 register bit description

9.5.16 Regulator status (REG_STATUS, address 20h)

This register stores the present status of the SW1, SW2, LDO1, LDO2. This is a READ ONLY register.

Bit

Symbol

Default value Type

Function

VOUTSW1 _OK 0

SW1 VOUT “Power-good” Status

0: VOUT_SW1 is not OK, i.e., VOUTSW1 / VOUTSW1(nominal) ≤

90 % or VOUTSW1 / VOUTSW1(nominal) ≥ 110 %

1: VOUT_SW1 is OK, i.e., 110 % > VOUTSW1 / VOUTSW1(nominal) >

90 %

VOUTSW2 _OK 0

SW2 VOUT “Power-good” Status

0: VOUT_SW2 is not OK, i.e., VOUTSW2 / VOUTSW2(nominal) ≤

90 % or VOUTSW2 / VOUTSW2(nominal) ≥ 110 %

1: VOUT_SW2 is OK, i.e., 110 % > VOUTSW2 / VOUTSW2(nominal) >

90 %

VOUTLDO1 _OK 0

LDO1VOUT “Power-good” Status

0: VOUTLDO1 is not OK, i.e., VOUTLDO1 / VOUTLDO1 (nominal) ≤

90 % or VOUT LDO1 / VOUT LDO1 (nominal) ≥ 110 %

1: VOUTLDO1 is OK, i.e., 110 % > VOUTLDO1 / VOUTLDO1

(nominal) > 90 %

VOUTLDO2_OK 0

LDO2VOUT “Power-good” Status

0: VOUTLDO2 is not OK, i.e., VOUTLDO2 / VOUTLDO2 (nominal) ≤

90 % or VOUTLDO2 / VOUTLDO2 (nominal) ≥ 110 %

Table 24. REG_STATUS 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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