Watchdog circuit for carbon monoxide monitors
US5828822A · kind A · utility
4Cited by
3References
7Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 21, 1995 |
| Grant date | Oct 27, 1998 |
| Priority date | — |
| Expiry date | Apr 21, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F11/1441
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A microcontroller supervision circuit comprising an electronic control capable of causing a high-impedance on at least one external pin upon occurrence of a reset condition. A supervision circuit is coupled to the at least one external pin for detecting the high-impedance condition. Upon detection of the high-impedance condition, a signal is generated to indicate failure of the microcontroller to execute code. The microcontroller is programmed to remove the high-impedance condition when code is properly executed within the microcontroller.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.