ADC AD-24 User Manual download pdf

HX711

TEL:

(592) 252-9530 (P. R. China)

AVIA SEMICONDUCTOR

EMAIL:

[email protected]

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

DESCRIPTION

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.

There is no programming needed for the

internal registers. All controls to the HX711 are

through the pins.

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

2.7~5.5V

VBG

PGA

Gain = 32, 64, 128

24-bit Σ∆

ADC

Input

MUX

Digital

Interface

Analog Supply Regulator

Internal

Oscillator

Bandgap Reference

HX711

XI XO

DOUT

PD_SCK

RATE

BASE VSUP DVDD

INB-

INB+

INA-

INA+

To/From

MCU

AVDD

AGND

Load cell

Fig. 1 Typical weigh scale application block diagram

VFB

0.1uF

10uF

S8550

AVDD

SUP

1 2 3 4 5 6 7 8 9

Summary of Contents

Page 1 - APPLICATIONS

HX711 TEL: (592) 252-9530 (P. R. China) AVIA SEMICONDUCTOR EMAIL: [email protected] 24-Bit Analog-to-Digital Converter (ADC) for Weigh ScalesDE

Page 2 - Pin Description

HX711 AVIA SEMICONDUCTOR 2Pin Description SOP-16L PackageVSUPAnalog Ground BASEAnalog Power AVDDCh. A Negative Input VFBCh. A Positive Input AG

Page 3

HX711 AVIA SEMICONDUCTOR 3KEY ELECTRICAL CHARACTERISTICS Parameter Notes MIN TYP MAX UNITFull scale differential input range V(inp)-V(inn)

Page 4 - 27 A 64

HX711 AVIA SEMICONDUCTOR 4Analog Inputs Channel A differential input is designed to interface directly with a bridge sensor’s differential outpu

Page 5 - Power down:

HX711 AVIA SEMICONDUCTOR 5DOUTPD_SCK 12MSBLSB24 25Next Conversion：CH.A, Gain:128 Current Output DataNext Output Data34PD_SCK12 24 25Next Convers

Page 6

HX711 AVIA SEMICONDUCTOR 6Reference PCB Board (Single Layer) Fig.4 Reference PCB board schematic Fig.5 Reference PCB board layout

Page 7 - Reference Driver (Assembly)

HX711 AVIA SEMICONDUCTOR 7Reference Driver (Assembly) /*------------------------------------------------------------------- Call from ASM:

Page 8

HX711 AVIA SEMICONDUCTOR 8 Reference Driver（C） //------------------------------------------------------------------- sbit ADDO = P1^5; sbit

Page 9

HX711 AVIA SEMICONDUCTOR 9 Package Dimensions 10.109.706.205.801.27 0.480.391.601.20SOP-16L PackageUnit: mmMAXMINTyp6.009.904.103.703.90

ADC AD-24 User Manual

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