Contactless integrated circuit comprising a wired logic anticollision circuit
US6779091B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 3, 2002 |
| Grant date | Aug 17, 2004 |
| Priority date | — |
| Expiry date | Jan 1, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG07C9/28
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An integrated circuit having an identification code of M bits includes a communication interface circuit for receiving a selective identification request and a selection code, and a processing circuit connected thereto. The processing circuit includes a logic comparator having a first input for receiving the selection code and a second input for receiving the identification code, and an output for delivering an equal signal if the selection and identification codes are equal. A shift register has an output coupled to the first input of the logic comparator. A serial memory stores the identification code, and has a serial output coupled to the second input of the logic comparator and to a serial input of the shift register. A controller is connected to the shift register and to the serial memory for loading the selection code into the shift register, and for applying M shift pulses to the shift register and M read pulses to the serial memory. An inhibiting circuit inhibits the logic comparator when N shift and read pulses have been applied to the shift register and to the serial memory.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.