HX711 – 24-Bit Analog-to-Digital Converter

Part Number : HX711

Function : 24-Bit Analog-to-Digital Converter

Manufactures : Avia semiconductor

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HX711 image

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Description :

HX711 24-Bit Analog-to-Digital Converter (ADC) for Weigh Scales Description Based on Avia Semiconductor’s patented technology, HX711 is a precision 24-bit analogto-digital converter (ADC) designed for weigh scales and industrial control applications to interface directly with a bridge sensor. The input multiplexer selects either Channel A or B differential input to the low-noise programmable gain amplifier (PGA). Channel A can be programmed with a gain of 128 or 64, corresponding to a full-scale differential input voltage of ±20mV or ±40mV respectively, when a 5V supply is connected to AVDD analog power supply pin. Channel B has a fixed gain of 32. Onchip power supply regulator eliminates the need for an external supply regulator to provide analog power for the ADC and the sensor. Clock input is flexible. It can be from an external clock source, a crystal, or the on-chip oscillator that does not require any external component. On-chip poweron-reset circuitry simplifies digital interface initialization. There is no programming needed for the internal registers. All controls to the HX711 are through the pins. VAVDD 10uF Load cell AVDD INA+ INAInput MUX PGA Gain = 32, 64, 128 Internal Oscillator 24-bit Σ∆ ADC Digital Interface Analog Supply Regulator Features • 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 including on-chip analog power supply regulator: normal operation < 1.5mA, power down < 1uA • Operation supply voltage range: 2.6 ~ 5.5V • Operation temperature range: -40 ~ +85℃ • 16 pin SOP-16 package Applications • Weigh Scales • Industrial Process Control S8550 VSUP 2.7~5.5V R2 R1 VFB BASE VSUP DVDD DOUT PD_SCK To/From MCU INB+ INBVBG RATE Bandgap Reference HX711 0.1uF AGND XI XO Fig. 1 Typical weigh scale application block diagram TEL: (592) 252-9530 (P. R. China) EMAIL: market@aviaic.com AVIA SEMICONDUCTOR HX711 Pin Description Regulator Power Regulator Control Output Analog Power Regulator Control Input Analog Ground Reference Bypass Ch. A Negative Input Ch. A Positive Input VSUP BASE AVDD VFB AGND VBG INNA INPA 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 DVDD RATE XI XO DOUT INPB INNB Digital Power Output Data Rate Control Input Crystal I/O and External Clock Input Crystal I/O Serial Data Output PD_SCK Power Down and Serial Clock Input Ch. B Positive Input Ch. B Negative Input SOP-16L Package Pin # 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Name VSUP BASE AVDD VFB AGND VBG INAINA+ INBINB+ PD_SCK DOUT XO XI RATE DVDD Function Power Analog Outpu [...]

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HX711 Datasheet

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