Device for acquisition of logic states from multiple sensors
US6704679B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 14, 2001 |
| Grant date | Mar 9, 2004 |
| Priority date | — |
| Expiry date | Jun 14, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B29/06
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A system for acquisition of logic states including sensors operable in all-or-nothing mode, each sensor including a switch linked with a pulling resistor between ground and power-supply potential, an analog multiplexer including an output and inputs linking the switches and resistors, voltage representative of the potential linked to a specific input, an analog-digital converter linked to the output, a calculating logic unit which drives the multiplexer and converter, generates input addresses of the multiplexer periodically and sequentially, reads and stores digital values at an output of the converter for each address, determines a digital value of the voltage, determines for each address corresponding to a sensor, a position of the digital value for an address with respect to a threshold, relating to an address, the position representing logic state of each sensor, and an altering device for altering the threshold as a function of the digital value of the voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.