Microcontrollers are programmable integrated circuits designed to control any particular application. Nowadays are present in many of the electronic devices that surround us: at work, at home and in our life in general. They can be found by controlling the operation of mobiles, computers, tablets, TVs, smart clocks, etc. These are also the main control devices in low-energy sensing nodes applied to smart cities and intelligent buildings. The microcontrollers have integrated hardware modules (called peripherals) in the same chipandthatcanworksimultaneouslywiththeexecutionofinstructionsmadebytheCPU. One of these peripherals is the analog-digital converter (ADC) that has the function of converting an analog input voltage to digital data. This bachelor thesis is intended to study the energy consumption of these integrated ADCs. To do this study, two integrated converters will be presented in different commercial microcontrollers and different experiments will be carried out to measure their consumption. The power consumption of the two ADCs will be studied separately and later a comparison will be made. Finally, conclusions will be drawn on the most appropriate mode of operation (for example, in terms of working frequency of this peripheral) for a lowconsumption ADC conversion that allows, for example, increasing the life time of sensor nodes.
Els microcontroladors son circuits integrats programables destinats a governar una apli- ´ cacio determinada. Aquests estan presents en molts dels dispositius electr ´ onics que ens ènvolten: a la feina, a casa nostra i en la nostra vida en general. Es poden trobar controlant el funcionament de mobils, ordinadors, tablets, TV, rellotges intel ` ·ligents, etc. Tambe s ´ onéls dispositius principals de control en nodes sensors de baix consum aplicats a ciutats i edificis intel·ligents. Els microcontroladors disposen de recursos hardware (anomenats periferics) integrats en èl mateix xip i que poden funcionar simultaniament amb l’execuci ` o d’instruccions feta per ´ la CPU. Un d’aquests periferics ` es el convertidor anal ´ ogic-digital (ADC) que t ` e la funci ´ o´ de convertir una tensio d’entrada anal ´ ogica en una dada digital. ` Aquest treball de final de grau esta destinat a estudiar el consum energ ` etic d’aquests ` ADC integrats. Per fer aquest estudi, es presentaran dos convertidors integrats en diferents microcontroladors comercials i es realitzaran diferents experiments per mesurar el seu consum. S’estudiara el consum d’energia dels dos convertidors ADC per separat i ` posteriorment es fara una comparativa. Finalment s’extrauran conclusions sobre el mode ` de funcionament mes adequat (per exemple, en quant a la freq ´ u¨encia de treball) per ob- ` tenir una conversio ADC de baix consum que permeti, per exemple allargar el temps de ´ vida de nodes sensors
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