Is it necessary to prepare external reference for TSC2003?
i.e. Can TSC2003 use touch-panel by internal reference?
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The internal 2.5V reference is only used for Vbat, AUX, or temperature measurements. The Touch panel measurements are taken using ratiometric conversions. Looking at the internal diagram, you can see that the ADC REF is taken directly from VDD. This also means that no external VREF is needed.