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Abstract

A circuit, method and microcontroller apparatus for performing an analog to digital conversion with continuously variable resolution is disclosed. The circuit includes a integrating modulator for converting an analog input signal, corresponding to an input voltage, to a digital signal at its output over an integrate time. The circuit also includes a counter with an enable input coupled to the integrating modulator output. The counter accumulates the number of cycles where the digital signal is positive during the sample period and provides a corresponding conversion result. Further, the circuit has a pulse width modulator; its output gates a clock to the counter enable input. The pulse width modulator is user programmable on-the-fly to set said integrate time and said sample period.

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First Claim