Transmission of differential optical detector signal over a single line
US6552716B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | May 5, 1999 |
| Grant date | Apr 22, 2003 |
| Priority date | — |
| Expiry date | May 5, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/0312
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A sensor for sensing movement of an encoder. At least two sensors are mounted adjacent the encoder. Each of the sensors provides an output corresponding to the amount of movement. A pair of comparators are connected to the sensors to provide two signal outputs. The comparator outputs are then provided to a digital encoding circuit which encodes the signals as a multi-bit serial value on a single output line. The bit value can be read by forcing control pulses onto the output line through an input buffer connected to the same line. The use of the single output line eliminates the extra output pin of the prior art, enabling a three pin package to be used.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.