The HX711 is a high-precision 24-bit A/D converter chip specifically designed for use in electronic scales. What sets it apart from other similar chips is its high level of integration, which includes essential peripheral components such as a regulated power supply and an internal clock oscillator. This design not only reduces the overall cost of the scale but also enhances system performance and reliability. Its compact and efficient structure makes it ideal for applications where space and simplicity are key factors.
The HX711 offers a straightforward interface with microcontroller units (MCUs), making it easy to implement. All control signals are managed through its pins, eliminating the need to configure internal registers. The chip features an input selector switch that allows users to choose between Channel A or Channel B. Channel A provides programmable gain settings of 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 useful for system parameter monitoring.
Additionally, the built-in regulated power supply can directly power both the external load cell and the internal A/D converter, eliminating the need for an extra analog power source on the main board. The internal clock oscillator requires no external components, further simplifying the design. The chip also includes a power-on auto-reset function, streamlining the startup process and improving system stability.
Below is the pin diagram of the HX711:
Here is a detailed pin description:
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