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Digital temperature sensors and calibration thereof

A digital temperature and temperature sensing technology, applied in the direction of thermometer testing/calibration, thermometers, instruments, etc., can solve the problem of uncompensated temperature error offset and other problems, and achieve the effect of avoiding disturbance

Active Publication Date: 2011-04-13
NXP BV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, subsequent dicing and packaging will result in an uncompensated temperature error shift

Method used

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  • Digital temperature sensors and calibration thereof
  • Digital temperature sensors and calibration thereof
  • Digital temperature sensors and calibration thereof

Examples

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Embodiment Construction

[0020] Figure 2 shows the measured bandgap reference voltage V REF four ways:

[0021] 1. Directly, through the output V REF ;

[0022] 2. Indirectly, through the output V PTAT and AD OUT , and calculate V according to equation (1) REF

[0023] 3. Indirectly, by inputting an external reference voltage V REFext , and a two-step subsequent analog-to-digital conversion: one using the internal reference, and the other using the external reference:

[0024] AD OUT 1 = V PTAT V REF , AD OUT 2 = V PTAT V REFext ⇒ V REF = AD OUT 2 AD ...

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Abstract

A method for calibrating a digital temperature sensor circuit, the circuit comprising an analogue temperature sensing means, an internal reference voltage source and an analogue-to-digital converter (ADC). The ADC is arranged to receive respective signals from the analogue temperature sensing means and the reference voltage source and output a digital signal indicative of the ambient temperature.The method comprises the steps of determining the value of the internal reference voltage outputted by the reference voltage source, comparing it with the desired reference voltage value, and adjusting the reference voltage source in response to the result of the comparison step. Such an electrical voltage mode calibration can significantly reduce production costs, as it can be performed much faster than a traditional thermal calibration.

Description

technical field [0001] The present invention relates to a digital temperature sensor, and in particular to an improved method of calibration of a digital temperature sensor. Such sensors are often used in integrated temperature sensor components, for example, in desktop and server computer applications. Background technique [0002] Figure 1 shows a block diagram of a known "smart" temperature sensor. It contains an analog temperature sensor that produces a voltage V that is precisely proportional to absolute temperature (PTAT) PTAT . In order to generate the digital output AD OUT , the analog-to-digital converter (ADC) relates the PTAT voltage to a temperature-independent bandgap reference voltage V REF Compared: [0003] AD OUT = V PTAT V REF - - - ( 1 ) [0004] Due to m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01K15/00G01K7/00
Inventor 迈克尔·A·P·佩尔蒂斯约翰·H·胡声
Owner NXP BV