公开(公告)号：US20230378804A1

公开(公告)日：2023-11-23

申请号：US17747977

申请日：2022-05-18

Applicant: NXP B.V.

Inventor： Miten H. Nagda ,  Edevaldo Pereira da Silva, JR. ,  Simon Gallimore ,  Nidhi Chaudhry

IPC: H02J9/06 ,  G06F1/30 ,  G06F1/26 ,  H02J7/00

CPC classification number: H02J9/068 ,  G06F1/305 ,  G06F1/263 ,  H02J7/0047

Abstract: A method and system are provided for supplying power to a backup power domain by connecting a battery voltage to a supply terminal for a backup power domain in a low power microcontroller during a startup mode when a main supply voltage, by detecting application of the main supply voltage to the low power microcontroller at a predetermined safe voltage level, and by activating a selection control circuit to power the backup power domain in the low power microcontroller from the main power supply voltage or the backup power supply voltage based on a software-controlled configuration bit, where the selection control circuit is configured to connect, in response to the software-controlled configuration bit having a first user-selected value, the main power supply voltage to the supply terminal for the backup power domain when the main power supply voltage is smaller than the battery power supply voltage.