This is one of the ADC Converter types.

Part Number: HX711

Function: 24-Bit Analog-to-Digital Converter (ADC) for Weigh Scales

Package: SOP-16 Type

Manufacturer: AVIA SEMICONDUCTOR ( aviaic.com )

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Decription

Based on Avia Semiconductor’s patented technology, HX711 is a precision 24-bit analog to-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. On chip 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 power on-reset circuitry simplifies digital interface initialization.

HX711 Pinout

Pin # Name Function Description
1 VSUP Power Regulator supply: 2.7 ~ 5.5V
2 BASE Analog Output Regulator control output（NC when not used）
3 AVDD Power Analog supply: 2.6 ~ 5.5V
4 VFB Analog Input Regulator control input（connect to AGND when not used）
5 AGND Ground Analog Ground
6 VBG Analog Output Reference bypass output
7 INA- Analog Input Channel A negative input
8 INA+ Analog Input Channel A positive input
9 INB- Analog Input Channel B negative input
10 INB+ Analog Input Channel B positive input
11 PD_SCK Digital Input Power down control (high active) and serial clock input
12 DOUT Digital Output Serial data output
13 XO Digital I/O Crystal I/O (NC when not used）
14 XI Digital Input Crystal I/O or external clock input, 0: use on-chip oscillator
15 RATE Digital Input Output data rate control, 0: 10Hz; 1: 80Hz
16 DVDD Power Digital supply: 2.6 ~ 5.5V

HX711 Features

1. Two selectable differential input channels
2. On-chip active low noise PGA with selectable gain of 32, 64 and 128
3. On-chip power supply regulator for load-cell and ADC analog power supply
4. On-chip oscillator requiring no external component with optional external crystal
5. On-chip power-on-reset
6. Simple digital control and serial interface

Applications

1. Weigh Scales
2. Industrial Process Control

HX711 Datasheet

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