In this article, we proposed a method for converting a temperature sensor analog signal into a frequency-modulated digital signal using the SLG46620. The main disadvantage of thermistors is their nonlinear dependence of the characteristic “resistance versus temperature.” In our case, this does not play a significant role, as during conversion, there is an exact correspondence of the frequency to thermistor resistance and, therefore, the temperature.įigure 9: GreenPAK designer schematic view of SLG46620V They have a significantly higher temperature coefficient of resistance compared with metal-resistive sensors (RTDs) and they cost much less.
The most widely used are NTC thermistors, which reduce the value of their electrical resistance with increasing temperature (see Figure 1). Design and circuit analysisĭifferent types of temperature sensors and their signal-processing circuits can be used depending on specific requirements, primarily in temperature range and accuracy. Also, digital signal transmission is more reliable than analog. Such direct transformation has no need for the use of expensive ADCs. Subsequently, the frequency of a digital signal that varies depending on temperature can then be more easily measured with fairly high accuracy and then converted to the required units of measurement. The purpose of this article is to develop and present a simplified technique for direct conversion of the analog signal from a temperature sensor into a digital signal with proportional frequency using the GreenPAK IC. For such a conversion, expensive analog-to-digital converters (ADCs) are commonly used. For processing by the CPU or computer, the analog temperature signal must be converted into a digital form. Typically, sensors convert the measured physical value into an analog signal, and temperature sensors are no exception here. Besides, the temperature measurement allows indirect determination of other physical parameters, such as matter flow rate, fluid level, etc. Temperature sensors are one of the most important kinds of physical sensors because many different processes (in everyday life as well) are regulated by temperature.
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