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HX711 Datasheet(PDF) 1 Page - Avia Semiconductor Co., Ltd.

No. de pieza HX711
Descripción Electrónicos  24-Bit Analog-to-Digital Converter (ADC) for Weigh Scales
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Fabricante Electrónico  AVIA [Avia Semiconductor Co., Ltd.]
Página de inicio  http://www.aviaic.com/ENDefault.aspx
Logo AVIA - Avia Semiconductor Co., Ltd.

HX711 Datasheet(HTML) 1 Page - Avia Semiconductor Co., Ltd.

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HX711
TEL:
(592) 252-9530 (P. R. China)
AVIA SEMICONDUCTOR
EMAIL: market@aviaic.com
V2.0
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 
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
R2
R1
0.1uF
10uF
S8550
VAVDD
VSUP


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