HX711–24 Bit Analog to Digital Converter (ADC)

HX711 is an ADC chip with preamplifier included. The chip is specifically designed for weight scales applications. The load cells which usually measure weight provide voltage outputs in millivolts. These outputs are difficult to handle directly by controllers, so we can use HX711 IC which takes these voltage signals and provide standard digital values which can be used by a microcontroller. The chip has integrated preamplifier specifically to handle these low voltages.

HX711 Pin Configuration

HX711 is a16 pin device. The chip is available in various packages choose one based on your requirement. The description for each pin is given below.

HX711 Features and Specifications

• Two selectable differential input channels
• On-chip active low noise PGA with selectable gain of 32, 64 and 128
• On-chip power supply regulator for load-cell and ADC analog power supply
• On-chip oscillator requiring no external component with optional external crystal
• On-chip power-on-reset
• Simple digital control and serial interface: pin-driven controls, no programming needed
• Selectable 10SPS or 80SPS output data rate
• Simultaneous 50 and 60Hz supply rejection
• Current consumption: normal operation < 1.5mA, power down < 1uA
• Operation supply voltage range: 2.6V to 5.5V
• Operation temperature range: -40℃ to +85℃