Rfid Transponder

• US 20080204194A1
• Filed: 04/04/2006
• Published: 08/28/2008
• Est. Priority Date: 04/15/2005
• Status: Active Grant

• Current Assignee: NXP B.V. (NXP Semiconductors NV)
• Original Assignee: NXP B.V. (NXP Semiconductors NV)
• Inventors: Bischof, Kurt, Haar, Helmut, Scharke, Heiko
• Granted Patent: US 9,436,899 B2
• Time in Patent Office: Days
• US Class Current: 340/10.1
• CPC Class Codes: G06K 19/0723 the record carrier comprising an arrangement for non-contact communication, e.g. wireless communication circuits on transponder cards, non-contact smart cards or RFIDs
• CPC Class Codes: G06K 7/0008 General problems related to the reading of electronic memory record carriers, independent of its reading method, e.g. power transfer
• CPC Class Codes: G06K 7/10039 interrogator driven, i.e. synchronous
• CPC Class Codes: H04B 7/0802 using antenna selection H04B7/0868 takes precedence; antenna beam directivity switching H01Q3/24
• CPC Class Codes: H04L 43/0864 Round trip delays

Abstract

An integrated circuit (1a) for a transponder (1), wherein said integrated circuit (1a) is switchable between a TTF (transponder talks first) and an RTF (reader talks first)-mode within a switching timeframe (TF2), wherein the position of the switching timeframe (TF2) is shif table in relation to a timeframe (TF1) allocated to the TTF-mode. In a preferred embodiment, the switching timeframe (TF2) is before a timeframe (TF1) allocated to the TTF-mode by default. After initialization of the transponder (1), the switching timeframe (TF2) is switched to a position after the timeframe.

Claims

1. An integrated circuit for a transponder, which integrated circuit is switchable between a TTF and an RTF-mode within a switching timeframe, wherein the position of the switching timeframe is shiftable in relation to a timeframe allocated to the TTF-mode.

2. An integrated circuit as claimed in claim 1, wherein the position of the switching timeframe is shiftable between a position before the timeframe allocated to the TTF-mode and a position after said timeframe allocated to the TTF-mode.

3. An integrated circuit as claimed in claim 1, wherein the position of the switching timeframe is shiftable from a position before the timeframe allocated to the TTF-mode to a position after said timeframe allocated to the TTF-mode.

4. An integrated circuit as claimed in claim 1, wherein the position of the switching timeframe is shiftable from a position after the timeframe allocated to the TTF-mode to a position before the timeframe allocated to the TTF-mode.

5. An integrated circuit as claimed in claim 1, wherein a default position of the switching timeframe is before the timeframe allocated to the TTF-mode before initialization of the integrated circuit.

6. A transponder with an integrated circuit as claimed in claim 1.

7. A method of initializing a transponders, said transponder being switchable between a TTF and an RTF-mode within a switching timeframe, wherein the position of the switching timeframe is shifted in relation to a timeframe allocated to the TTF-mode after writing initial data to the transponder and/or establishing an initial condition, necessary for further use of the transponder.

8. A method as claimed in claim 7, wherein the position of the switching timeframe is shifted between a position before the timeframe allocated to the TTF-mode and a position after said timeframe allocated to the TTF-mode after writing initial data to the transponder and/or establishing an initial condition, necessary for further use of the transponder.

9. A method as claimed in claim 7, wherein the switching timeframe is shifted from a position before a timeframe allocated to the TTF-mode to a position after said timeframe allocated to the TTF-mode after writing initial data to the transponder and/or establishing an initial condition, necessary for further use of the transponder.

10. A method as claimed in claim 7, wherein the switching timeframe is shifted from a position after a timeframe allocated to the TTF-mode to a position before said timeframe as allocated to the TTF-mode after writing initial data to the transponder and/or establishing an initial condition, necessary for further use of the transponder.