Dual-mode data carrier and circuit for such a data carrier with improved mode change-over
US6199763A · kind A · utility
9Cited by
3References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 22, 1998 |
| Grant date | Mar 13, 2001 |
| Priority date | — |
| Expiry date | Sep 22, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K19/0723
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A data carrier (1) which can be operated in a contact-bound mode and in a contactless mode and a circuit (1A) for such a data carrier (1) has a.c. detection means (69) for detecting the presence of a useful HF signal (HF) received via a transmission coil (31) and clock signal detection means (73) for detecting a clock signal (CLK1) received via a transmission contact (16), and has logic means (82) which cooperate with the a.c. detection means (69) and the clock signal detection means (73) and which enable the activation of the contact-bound mode (CONTACT) and the activation of the contactless mode (CONTACTLESS) to be initiated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.