Voltage detection circuit with hysteresis for low power, portable products
US7378886B2 · kind B2 · utility
1Cited by
11References
11Claims
0Family size
Inventor
Key dates
| Filing date | Oct 14, 2004 |
| Grant date | May 27, 2008 |
| Priority date | — |
| Expiry date | Jan 8, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K17/00
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A supply voltage level detection circuit makes use of an additional supply already provided for power. A voltage detection circuit defines a first threshold, and a differencing circuit defines a second threshold. The output state of the differencing circuit is saved in a latch. The latch may be cross coupled gates of cross coupled inverters. When inverters are used, the differencing circuit output contends with the internal latch drive when setting or resetting the latch. The design allows the differencing circuit to overcome the inverter's internal drives to change the logic state of the latch.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.