User

's Guide

SBAU120B

– November 2005 – Revised July 2011

ADS1232REF User

's Guide

The ADS1232REF is a reference design for the ADS1232 24-bit, delta-sigma analog-to-digital converter

(ADC). It contains all the circuitry and user interface elements needed for a weigh-scale digitizer, and is

meant as an example of good design for a basic weigh-scale system. The ADS1232REF is also suitable

for general evaluation of the ADS1232 device. Additionally, performance results obtained with the

ADS1232REF are applicable to the ADS1234, a device with identical performance.

The ADS1232REF hardware has the following features:

•

ADS1232 ADC

•

Connections for load cells or other voltage sources

•

Low-side excitation switch on the load cell header connector

•

Ample EMI/RFI suppression between the ADC and rest of design

•

Eight-digit starburst LCD readout

•

USB connection for firmware updates and remote control

•

Designed for very low power consumption

•

Battery (9V) or wall power

Version 1.1.0 of the firmware includes the following features:

•

Weigh-scale mode with two-point calibration

•

Complete configuration of the device

•

Real-time peak-to-peak and RMS noise calculation

•

Autoranging voltage display

•

Noise displayed in volts, codes, and bits

•

Voltage displayed in volts or codes

•

Adjustable averaging mode

•

Raw hexadecimal code display

•

Simple and fast configuration

•

Parameters saved to internal flash memory

•

Computer link

Graphical PC software is also provided for histogram display, datalogging, and device control.

We welcome bug reports and suggestions for additional features; please contact the Texas Instruments

Precision Analog Applications Group.

Hyperterm is a trademark of Microsoft Corporation.

Windows is a registered trademark of Microsoft Corporation.

All other trademarks are the property of their respective owners.

1

SBAU120B

– November 2005 – Revised July 2011

ADS1232REF User

's Guide

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