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The ADS1230REF is a reference design for the
(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 ADS1230REF is also suitable
for general evaluation of the ADS1230 device.
The ADS1230REF hardware has the following features:
• ADS1230 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.
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All other trademarks are the property of their respective owners.
SBAU125A – August 2007 – Revised September 2007
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SBAU125A – August 2007 – Revised September 2007
ADS1230REF User's Guide
ADS1230
20-bit, delta-sigma analog-to-digital converter
User's Guide
ADS1230REF User's Guide
1
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Table of Contents
Related Manuals for Texas Instruments ADS1230REF
Summary of Contents for Texas Instruments ADS1230REF
- Page 1 (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 ADS1230REF is also suitable for general evaluation of the ADS1230 device.
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Page 2: Table Of Contents
Serial Console ........................Hardware ................... Appendix A Schematic and Layout List of Figures .................. ADS1230REF Controls and Connectors ..................4-Wire Load Cell to Terminal Block ..................6-Wire Load Cell to Terminal Block ....................4-Wire Load Cell to Header ....................6-Wire Load Cell to Header .................. -
Page 3: Getting Started
The ADS1230REF operates in one of three modes: • Scale mode: When the mode select switch is in Scale position, the ADS1230REF acts as a basic weigh scale. The scale has tare, range, and calibrate functions, and can display metric (SI) units. Other parameters can be configured in configuration screens. -
Page 4: 4-Wire Load Cell To Terminal Block
JTAG. Power To apply power to the ADS1230REF, connect a 9V battery or plug in a 6V–9V ac wall adapter. AC adapters must be tip positive/sleeve negative. When an ac adapter is plugged in, the board always takes power from it, and not from the battery. -
Page 5: 6-Wire Load Cell To Terminal Block
For this configuration, the reference select switch should be in the EXT position for best performance. The +5V position also works, but the device may not perform as well. SBAU125A – August 2007 – Revised September 2007 ADS1230REF User's Guide Submit Documentation Feedback... - Page 6 Getting Started Connecting Other Signal Sources In general, the ADS1230REF can accurately measure any voltage in the input range of the ADS1230 ADC, as long as the following rules are observed: • Never apply a negative voltage to the inputs of the ADS1230REF. The ADS1230 cannot accept negative voltages at its input.
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Page 7: Weigh Scale Mode
Weigh Scale Mode Obtaining a calibration weight: Before the ADS1230REF can display the mass of an object, it must measure the output of the load cell for a previously known mass. The known mass can be adjusted. At power-up, the ADS1230REF expects a 5kg mass. If this mass is not available, or if the load cell range is not compatible with this mass, the calibration mass can be changed in the following manner: 1. -
Page 8: Unit Conversion Factors And Display Formats
The display format for stone differs from the format used for the other units. One stone is equal to fourteen pounds; weight in stone is commonly expressed as a number of stone followed by a number of pounds. On the ADS1230REF, two digits are shown for stone, followed by st, followed by pounds displayed to two decimal places. -
Page 9: Parameters In Configuration Mode
Calibration mass and unit Offset calibration OCAL? — Offset calibration; see text Save parameters SAVE? — Save parameters; see text Version number V1.1.0 — Firmware version number display SBAU125A – August 2007 – Revised September 2007 ADS1230REF User's Guide Submit Documentation Feedback... - Page 10 Version number: This screen displays the version number of the ADS1230REF firmware. The ADS1230REF cannot detect the frequency of the ADS1230 master clock, so it cannot display the actual data rate of the ADS1230 device.
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Page 11: Analysis Mode
Analysis Mode Analysis Mode In Analysis mode, the ADS1230REF analyzes code output from the ADS1230 and displays it in different ways. Table 3 summarizes the numerous display modes available, together with example displays. Table 3. Modes and Example Displays... -
Page 12: Voltage Display Ranges
In block collection modes, the apostrophes form a bar graph. As the collection of a block proceeds, the bar graph increases. When the bar graph reaches all the way to the right, the new result is generated and collection restarts. ADS1230REF User's Guide SBAU125A – August 2007 – Revised September 2007 Submit Documentation Feedback... -
Page 13: Parameters In Analysis Mode
ADS1230 to enter power-down mode. This action occurs by pulling the PDWN line low. While the PDWN line is low, the display reads POWER DN. When a button is pressed from this display, the ADS1230REF powers the converter on and returns to the analysis display, exiting configuration mode. -
Page 14: Using The Pc Software
In Windows, the program ® communicates with the ADS1230REF using a virtual COM port driver that causes the USB connection to appear to Windows as a normal serial port. The necessary driver is installed with the EVM software. Installation and Setup The ADS1230REF software is distributed in an installer program called ADS123x-setup-withLVRT-1.1.1.exe (the version number in the file name may differ), distributed on... -
Page 15: Ads1230Ref Pc Software Display
To do this step, it opens every available serial port in turn, testing it to see if there is an ADS1230REF connected. The program uses the first ADS1230REF it finds. -
Page 16: Ads1230Ref Average Data
The strip chart display shows both the full precision result of the averages and the integer version, as illustrated in Figure Strip Chart Histogram Figure 7. ADS1230REF Average Data ADS1230REF User's Guide SBAU125A – August 2007 – Revised September 2007 Submit Documentation Feedback... - Page 17 This processing delay is timed so that the display updates at least every 0.75 seconds. Data Recording The ADS1230REF software can record incoming samples to a text file. This file can be loaded into other programs for analysis. Data recording is performed using the controls in the Recording box.
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Page 18: Serial Console
4.7.1 File Format Data files begin with a header that contains the text collected from ADS1230REF, the time of recording, and the speed and gain. Following this header, values are written in either volts or raw codes, with one value per line. Line separators are in DOS format, consisting of a carriage return and a line feed. This format can be examined in a text editor and loaded or imported into most other software, including spreadsheets. -
Page 19: Console Mode Commands
Initiates an offset calibration on the ADS1230, using the method described in the datasheet. 5.2.4 V—Show Version Displays a message containing the firmware version and copyright notice. SBAU125A – August 2007 – Revised September 2007 ADS1230REF User's Guide Submit Documentation Feedback... -
Page 20: Hardware
• C0—set to channel 0 • C—(with no arguments) prints the current channel, always CHAN=0 5.2.8 Q—Query Parameters Q causes the ADS1230REF to issue a coded string summarizing the current settings. The format of the string is: P[0,1]R[F,S]OIC0 followed by a carriage-return and linefeed. -
Page 21: Load Cell Header Pinout
User Interface The ADS1230REF user interface consists of the display and switches SW2–5 and SW8. Switches are connected to interrupt-capable GPIOs on the microcontroller, allowing them to wake the microcontroller from sleep mode. -
Page 22: Terminal Block Pinout
USB interface module, a microcontroller, and a 16550-type UART. Driver software is available that causes the device to appear as a serial port on the host PC. The USB interface is powered separately from the rest of the ADS1230REF; it takes power from the USB line, through linear regulator U3. - Page 23 USB. This feature also protects the microcontroller from unknown states on these pins at power-up. SBAU125A – August 2007 – Revised September 2007 ADS1230REF User's Guide Submit Documentation Feedback...
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Page 24: Appendix A Schematic And Layout
Appendix A Appendix A Schematic and Layout The printed circuit board (PCB) layouts for the top and bottom sides of the ADS1230REF are shown in Figure A-1 Figure A-2, respectively. Schematics for the ADS1230REF are shown in Section A.3. The bill of materials is provided in Table A-1. - Page 25 Bill of Materials Table A-1. ADS1230REF Bill of Materials (continued) Reference Designator Description Manufacturer Mfg. Part Number USB to Serial Converter Texas Instruments TUSB3410VFG4 Analog Switch, SPST Texas Instruments TS5A3166DCKR U8, U9 Digital Isolator Texas Instruments ISO721DG4 U10, U11...
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Page 26: Ads1230Ref Pcb-Top Side
PCB Layout PCB Layout Figure A-1. ADS1230REF PCB—Top Side Figure A-2. ADS1230REF PCB—Bottom Side Schematic and Layout SBAU125A – August 2007 – Revised September 2007 Submit Documentation Feedback... -
Page 27: Ads1230Ref Schematic-Adc
Schematics Schematics Figure A-3. ADS1230REF Schematic—ADC SBAU125A – August 2007 – Revised September 2007 Schematic and Layout Submit Documentation Feedback... -
Page 28: Ads1230Ref Schematic-Mcu
Schematics R13 100 R12 100 Figure A-4. ADS1230REF Schematic—MCU Schematic and Layout SBAU125A – August 2007 – Revised September 2007 Submit Documentation Feedback... -
Page 29: Ads1230Ref Schematic-Usb
Schematics Figure A-5. ADS1230REF Schematic—USB SBAU125A – August 2007 – Revised September 2007 Schematic and Layout Submit Documentation Feedback... - Page 30 EVALUATION BOARD/KIT IMPORTANT NOTICE Texas Instruments (TI) provides the enclosed product(s) under the following conditions: This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION PURPOSES ONLY and is not considered by TI to be a finished end-product fit for general consumer use. Persons handling the product(s) must have electronics training and observe good engineering practice standards.
- Page 31 TI as compliant with ISO/TS 16949 requirements. Buyers acknowledge and agree that, if they use any non-designated products in automotive applications, TI will not be responsible for any failure to meet such requirements. Following are URLs where you can obtain information on other Texas Instruments products and application solutions: Products...
- Page 32 Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Texas Instruments ADS1230REF...
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