The HX711 is a 24-bit A/D converter chip developed by Haixin Technology, specifically designed for high-precision electronic scales. This advanced IC integrates essential peripheral circuits such as a regulated power supply and an internal clock oscillator, which significantly reduces the need for external components. As a result, it offers higher integration, faster response times, and stronger resistance to interference. This not only lowers the overall cost of the scale but also enhances its performance and reliability.
The HX711 is easy to interface with a microcontroller unit (MCU), as all control signals are managed through digital pins without the need to program internal registers. It features two input channels: Channel A provides programmable gain options of 128 or 64, allowing for differential input signals of ±20mV or ±40mV respectively, while Channel B has a fixed gain of 64, ideal for system parameter monitoring. The built-in voltage regulator supplies power directly to both the sensor and the on-chip A/D converter, eliminating the need for an additional analog power supply. The internal clock oscillator requires no external components, and the power-on auto-reset function simplifies the startup process.
Key features include:
1. Two-channel differential input selection
2. On-chip low-noise programmable amplifier with gains of 64 and 128
3. Integrated voltage regulator for sensors and A/D conversion
4. Internal clock oscillator with optional external crystal support
5. Power-on automatic reset for simplified initialization
6. Simple digital control with no register programming required
7. Adjustable output data rates of 10Hz or 80Hz
8. Built-in suppression of 50Hz and 60Hz power line noise
9. Low power consumption: 1.7mA typical operating current, 1μA in standby
10. Wide operating voltage range: 2.6V to 5.5V
11. Extended temperature range: -20°C to +85°C
12. Compact 16-pin SOP package
The HX711 is widely used in industrial and consumer weighing systems due to its efficiency, accuracy, and ease of use. Whether you're building a precision scale or a smart weighing device, this chip is a reliable and cost-effective solution that delivers outstanding performance.
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