Precise temperature sensor with smart programmable calibration
US7204638B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | May 23, 2005 |
| Grant date | Apr 17, 2007 |
| Priority date | — |
| Expiry date | Oct 12, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01K15/00
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A temperature sensor with a plurality of temperature sense points based on a bandgap reference circuit providing negative temperature coefficient reference voltages and a positive temperature coefficient reference voltage. All negative temperature coefficient reference voltages have the same slope and the same spacing from each other. The intercept points between the negative temperature coefficient reference voltages and the positive temperature coefficient reference voltage determine the temperature sense points. Efficient calibration of the spacing of the temperature sense points is provided by a tap on a programmable resistor in the positive temperature coefficient reference circuit. Efficient calibration of the absolute temperature is provided by second programmable resistors in a circuit driven by two current sources. The calibration of one temperature point equally applies to all other second programmable resistors.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.