A/D collection method and device based on single chip microcomputer

Abstract

The invention discloses an A / D collection method and device based on a single chip microcomputer. The method comprises the following steps: dividing an interval range of a preset to-be-tested voltagevalue into N sub-intervals; comparing the actual to-be-tested voltage with an upper limit voltage of the interval, and classifying the actual to-be-tested voltage into the sub-interval K; differencingthe actual to-be-tested voltage with the upper limit voltage of the sub-interval K to obtain a difference, wherein the obtained difference is amplified to obtain an amplification signal; performing AD sampling on the obtained amplification signal through the single chip microcomputer, and converting into a voltage value; and differencing the upper limit voltage value of the sub-interval K and thevoltage value obtained through the sampling and conversion of the single chip microcomputer AD to acquire an actual numerical value of the to-be-tested value. Through the A / D collection method and collection device disclosed by the invention, the collection resolution is improved for several times on the basis of the sampling resolution of the AD unit integrated in the single chip microcomputer.

Description

technical field [0001] The invention belongs to the technical field of single-chip AD acquisition, in particular to an A / D acquisition method and device based on a single-chip microcomputer. Background technique [0002] In the remote analog quantity control mode, most of them use single-chip microcomputer to realize A / D acquisition; the acquisition accuracy of voltage signal generally depends on the acquisition digits of A / D acquisition chip, the higher the acquisition digits, the higher the signal acquisition accuracy; if The number of acquisition bits of the A / D acquisition chip is n, and the voltage acquisition interval is (0, V), then the minimum acquisition accuracy of the A / D acquisition chip is δ=V / (2n-1). [0003] At present, limited by the technical level and cost, it is very limited to increase the number of acquisition bits of the A / D acquisition chip, especially the integrated AD unit in the single-chip microcomputer. [0004] To sum up, there is an urgent need...

AI Technical Summary

Problems solved by technology

[0003] At present, limited by the technical level and cost, it is very limited to increase the number of acquisition bits of the A / D acquisition chip, especially the integrated AD unit in the single-chip microcomputer.

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