The HX711 is a high-precision, 24-bit analog-to-digital converter (ADC) specifically designed for load cell and weight scale applications. It features low noise, high resolution, and a simple interface for microcontrollers. The chip includes an internal low-noise programmable amplifier with selectable gains of 64x or 128x, making it suitable for bridge-type sensors like load cells. It operates with minimal external components, supports two differential input channels, and has a built-in clock oscillator. The HX711 simplifies the design of precision weight measurement systems with its stable performance and ease of integration.

Feature

• Two selectable differential input channels.
• On-chip active low-noise PGA with selectable gain of 32, 64, or 128.
• On-chip power supply regulator for load-cell and ADC analog power supply.
• Built-in oscillator requiring no external components (optional external crystal support).
• On-chip power-on-reset for improved stability.
• Simple digital control and serial interface with pin-driven controls, no programming required.
• Selectable output data rate: 10 SPS or 80 SPS.
• Simultaneous 50 Hz and 60 Hz supply rejection for noise immunity.
• Low power consumption: < 1.5 mA during normal operation, < 1 μA in power-down mode.
• Wide operating voltage range: 2.6 V to 5.5 V.
• Operating temperature range: -20°C to +85°C.

Applications

• Electronic scales
• Sensor data acquisition
• Precision measurement instruments