Method and device for improving analog-to-digital conversion precision of single-chip microcomputer

Abstract

The present invention relates to a method and device for improving the analog-to-digital conversion precision of a single-chip microcomputer. The method includes the following steps that: whether the power source voltage fluctuation of the single-chip microcomputer is caused by the internal cause of the single-chip microcomputer is judged; and when the power source voltage fluctuation of the single-chip microcomputer is caused by the internal cause of the single-chip microcomputer, a register corresponding to the PWM module of the single-chip microcomputer and a register corresponding to the analog-to-digital converter of the single-chip microcomputer are configured, so that the output frequency of the PWM module can be equal to the integer multiples of the clock frequency of the analog-to-digital converter. According to the method and device of the invention, the registers of the single-chip microcomputer are configured, so that the output frequency of the PWM module of the single-chip microcomputer can be equal to the integer multiples of the clock frequency of the analog-to-digital converter of the single-chip microcomputer. With the method and device for improving the analog-to-digital conversion precision of the single-chip microcomputer provided by the invention adopted, the analog-to-digital conversion precision of the single-chip microcomputer will not be affected by the power source voltage fluctuation under the premise that no hardware is additionally adopted.

Description

technical field

[0001] The invention relates to the field of electronic technology, in particular to a method and a device for improving the precision of analog-to-digital conversion of a single-chip microcomputer. Background technique

[0002] In many application scenarios of single-chip microcomputers, the power supply voltage Vcc of single-chip microcomputers will inevitably fluctuate. If a microcontroller equipped with an analog-to-digital converter (Analog-to-Digital Converter, ADC) is used in these application scenarios, the conversion accuracy of the analog-to-digital converter will be seriously reduced. figure 1 A schematic circuit diagram showing a microcontroller connected to a MOS (Metal-Oxide-Semiconductor, Metal-Oxide-Semiconductor) tube through a pin. figure 1 The circuit shown is used in a large number of application scenarios. exist figure 1 In the circuit shown, when the microcontroller outputs a PWM (Pulse Width Modulation, pulse width modulation) wave s...

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