Pt100-based temperature sensor circuit and temperature measurement method thereof
A temperature sensor and circuit technology, applied in thermometers, thermometers and instruments using electrical/magnetic components directly sensitive to heat, etc., can solve problems such as low sensitivity and achieve the effect of small size
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[0043] In order to illustrate the present invention more clearly, the present invention will be further described below in conjunction with preferred embodiments and accompanying drawings. Similar parts in the figures are denoted by the same reference numerals. Those skilled in the art should understand that the content specifically described below is illustrative rather than restrictive, and should not limit the protection scope of the present invention.
[0044] like figure 1 As shown, a temperature sensor circuit based on Pt100, its working principle is:
[0045] In the present invention, the circuit includes a measurement module, a reading module, a conversion module and a display module.
[0046] The measurement module includes a Pt100 resistor R t , precision resistor R c and bias resistor R bias, the reading module is an AD7793 chip with a built-in bandgap reference voltage source, a low-noise programmable gain instrumentation amplifier and a programmable current s...
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