Invention Grant
- Patent Title: Stress tolerant power supply voltage detector circuit operable over a wide range of power supply voltages
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Application No.: US15653034Application Date: 2017-07-18
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Publication No.: US10382033B2Publication Date: 2019-08-13
- Inventor: Prashant Singh
- Applicant: STMicroelectronics International N.V.
- Applicant Address: NL Schiphol
- Assignee: STMicroelectronics International N.V.
- Current Assignee: STMicroelectronics International N.V.
- Current Assignee Address: NL Schiphol
- Agency: Crowe & Dunlevy
- Main IPC: H03K17/22
- IPC: H03K17/22 ; G05F1/56 ; G06F1/30 ; G06F1/24

Abstract:
A power supply voltage detector circuit monitors a ramping supply voltage and selectively enables a voltage divider for operation to divide the ramping supply voltage in response to the ramping supply voltage exceeding a first threshold. Additionally, a variable resistance of the voltage divider is changed in response to the ramping supply voltage exceeding a second threshold. A voltage output from the voltage divider is used to generate a bandgap voltage used as a reference voltage in comparison operations for controlling enabling of the voltage divider and selection of the variable resistance.
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