ADS1232REF User s Guide Texas Instruments（ADS1232REF用户指南德州仪器）.pdf

Users Guide SBAU120B–November 2005–Revised July 2011 ADS1232REF Users 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 pro