HX710

TEL:

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

AVIA SEMICONDUCTOR

24-Bit Analog-to-Digital Converter (ADC) with Built-in Temperature Sensor

DESCRIPTION

Based on Avia Semiconductor’s patented

technology, HX710 is a precision 24-bit analog-

to-digital

converter

(ADC)

with

built-in

temperature sensor designed for weigh scales and

industrial control applications to interface directly

with a bridge sensor.

The input low-noise amplifier (PGA) has a

fixed gain of 128, corresponding to a full-scale

differential input voltage of ±20mV, when a 5V

reference voltage is connected to the VREF pin.

On chip oscillator provides the system clock

without 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 HX710 are through the pins.

FEATURES

• On-chip temperature measurement

• On-chip active low noise amplifier with a gain of

128

• On-chip oscillator requiring no external

component

• On-chip power-on-reset

• Simple digital control and serial interface:

pin-driven controls, no programming needed

• Selectable 10SPS or 40SPS output data rate

• Simultaneous 50 and 60Hz supply rejection

• Current consumption:

normal operation < 1.2mA, power down < 1uA

• Operation supply voltage range: 2.6 ~ 5.5V

• Operation temperature range: -40 ~ +85℃

• 8 pin SOP-8 or DIP-8 package

Fig. 1 Typical weigh scale application block diagram

Charger

Battery

LED

Regulator

L1

LCD

4.7k

AVDD

DVDD

DOUT

PD_SCK

VREF

AGND

INN

INP

Loadcell

0.1u

1u

0.1u

Q1

0.1u

1k

1k

MCU

HX710

I/O

I/O

VDD

1u

I/O