RFID transponder and RFID transponder chip
US7554448B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 15, 2006 |
| Grant date | Jun 30, 2009 |
| Priority date | — |
| Expiry date | Dec 27, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K19/0717
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A nonvolatile memory is accessed by a memory control circuit and stores temperature information indicating a temperature measured by a temperature sensor. A power supply control circuit supplies a first power supply voltage to the temperature sensor in response to a request for temperature measurement received via an antenna, and supplies a second power supply voltage to the nonvolatile memory and the memory control circuit after the temperature sensor measures the temperature. While the temperature sensor is measuring the temperature, the nonvolatile memory and the memory control circuit do not operate and thus do not generate heat. Therefore, the temperature sensor can accurately measure the temperature without being influenced from the heat generation caused by the operation of circuits in an RFID transponder.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.