The HX711 is a high-precision 24-bit A/D converter chip specifically designed for use in electronic scales. Compared to similar chips, it offers a highly integrated solution by including essential peripheral components such as a regulated power supply and an internal clock oscillator. This makes the HX711 not only more compact but also easier to implement, reducing both the cost and complexity of the overall system. Its fast response time and strong resistance to interference significantly enhance the performance and reliability of the scale.
The HX711 is also user-friendly when interfacing with a microcontroller unit (MCU). The control signals are managed directly through its pins, eliminating the need to configure internal registers. This simplifies the programming process and reduces development time. The chip features an input selector that allows users to choose between Channel A or Channel B. Channel A offers programmable gain settings of either 128 or 64, corresponding to full-scale differential input ranges of ±20mV or ±40mV, respectively. Channel B, on the other hand, has a fixed gain of 32, which is ideal for system calibration and parameter monitoring.
One of the standout features of the HX711 is its built-in regulated power supply, which can directly power both the external load cell and the internal A/D converter. This eliminates the need for an additional analog power source on the main board, further reducing component count and system complexity. Additionally, the internal clock oscillator requires no external components, making the design even more streamlined.
The HX711 also includes a power-on auto-reset function, ensuring a smooth startup process without manual intervention. These features make it a popular choice for applications requiring high accuracy and ease of integration.
Below is the pin diagram of the HX711:
Here is a detailed pin description:
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