Digital potentiometer and control method thereof

Abstract

The invention relates to a digital potentiometer and a control method thereof. The digital potentiometer comprises an output module (400), a single wire interface (100), an excitation signal receiving module (200) receiving effective excitation signals from the single wire interface (100) and an output control module (300) which controls the output module (400) according to the effective excitation signal. The control method of the digital potentiometer comprises the following steps: S1, receiving the effective excitation signal from the single wire interface; and S2, controlling the output of the digital potentiometer according to the effective excitation signal. The invention has the following beneficial effects of simple use method because of adoption of the single wire interface, few occupied signal wires, low replacement cost and adoption of contact regulation or microcontroller regulation, and adaptability to requirements of users.

Description

technical field [0001] The invention relates to the field of electronic technology, more specifically, to a digital potentiometer and a control method thereof. Background technique [0002] The digital potentiometer is used to output adjustable resistance value or voltage signal under the control of digital input signal. The basic structure is as follows: figure 1 shown. The position of the output slider of the digital potentiometer is controlled by the value of the register, and the input signal changes the value of the register through the control logic, thereby changing the output. Compared with mechanical potentiometers, digital potentiometers generally have the following advantages due to the digital control technology: [0003] High resolution, fast adjustment speed; [0004] High reliability: strong anti-vibration, anti-interference ability, and no mechanical wear; [0005] No mechanical tools are required for adjustment, and the device does not require adjustment...

AI Technical Summary

Problems solved by technology

Among them, IIC is a two-wire interface, the communication protocol is more complicated, and the implementation cost is higher

SPI and up / down interface protocols are relatively simple, but need to occupy three signal lines

Moreover, the above three interfaces require an additional microprocessor (MCU) for control, and cannot be manually adjusted.

These three interfaces make digital potentiometers bring additional costs when replacing mechanical potentiometers, and the scope of application is limited

For the button-type interface, although it can be controlled manually, it still needs to occupy at least two signal lines, and a certain amount of space is required to place the buttons, and the cost of control and adjustment is relatively high.

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