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.

公开(公告)号：US20230176097A1

公开(公告)日：2023-06-08

申请号：US17643052

申请日：2021-12-07

Applicant: NXP B.V.

Inventor： Ricardo Pureza Coimbra ,  Edevaldo Pereira da Silva, JR. ,  Felipe Ricardo Clayton

IPC: G01R19/257 ,  H03M1/12

CPC classification number: G01R19/257 ,  H03M1/1245

Abstract: An integrated circuit includes an analog-to-digital converter (ADC) configured to receive input voltage, and first and second reference voltages, and outputs digital code representing ratios between the input voltage and the first and the second reference voltages. The first and second reference voltages are generated by a reference generator using different current densities. During a first stage, the ADC samples the first input voltage and the first reference voltage and transfers equivalent charge of the sampled first input voltage and first reference voltage to an integration capacitor. During a second stage, the ADC samples the second reference voltage and transfers equivalent charge of the sampled second reference voltage to the integration capacitor. The ADC provides one bit of digital code based on total charge stored on the integration capacitor after the transfers of charge of the sampled input voltage, and the sampled first and second reference voltages.