Power detection system and circuit for high voltage supply and low voltage devices
US7800420B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 31, 2008 |
| Grant date | Sep 21, 2010 |
| Priority date | — |
| Expiry date | Mar 30, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K17/223
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A power detect system and circuit for detecting a voltage level of an input/output supply voltage (VDDIO) in a circuit of low voltage devices is disclosed. In one embodiment, the power detect system and circuit includes a voltage divider coupled between the VDDIO and a negative supply voltage (VSS) for generating a bias voltage, a first inverter coupled between a core voltage (VDD) and the VSS for generating a first node voltage based on the bias voltage, a native device coupled between the VDDIO and the VSS for generating a second node voltage based on the bias voltage, and a switch coupled between the first inverter and the native device for controlling the second node voltage based on the first node voltage. The power detect system further includes a second inverter coupled between the VDD and the VSS for generating an output voltage based on the second node voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.