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PGA309
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  • Forum Post: PGA309 with external EEPROM

    Oliver Yang
    I'm using PGA309 with external EEPROM to hold some parameters. I'm a little bit confused on what's in the PGA309 user's guide. At Figure 4-6, "Set EEPROM Address Pointer Timing", it shows the EEPROM address pointer is 11-bit. What if I have an 8-bit EEPROM like the example showing...
    on Jun 17, 2010

  • Forum Post: Re: PGA309 Questions

    Art Kay
    Paul, The PGA309 output is pulled to ground via Rfo and Rgo when the output is in high impedance (see table 2.1, pp 26 in the PGA309 users guide). The value Rfo and Rgo depends on the output gain setting, but is greater then 20k ohms. I would expect that you should get close to 5V using a 1k ohm...
    on Feb 18, 2011

  • Forum Post: pga309evm-usb usage

    Cor
    Hello all, I'm using the pga309evm-usb after I had problems with the pga309evm without usb. This evm looks far more professional the the predecessor but i'm facing some problems. I have connected a full bridge sensor end setup all the jumpers to ext mode for the external bridge. If I want...
    on Mar 22, 2011

  • Forum Post: Re: pga309evm-usb usage

    Cor
    Hi, I got new software from TI (Arthur Kay). Every thing works fine now. It is exactly working as expected. It's a very good tool. All problems are solved now. Thanks, Cor
    on Apr 20, 2011

  • Forum Post: Re: How to address a single PGA309 via single I2C when using multiple PGA309?

    Ian Williams
    Hello André, Our resident PGA309 expert is out on vacation this week so I've taken a look at this for you. I did some initial testing with the PGA309EVM, and changing the voltage at the TEST pin from 0V to Vdd did not affect the digital communication of the chip. That indicates to me that...
    on Jul 27, 2011

  • Forum Post: Re: How to address a single PGA309 via single I2C when using multiple PGA309?

    Ian Williams
    Hello again André, Our suspicions were correct. You must multiplex the SDA and SCL lines of each PGA309 in your system. We have a useful document which provides guidance in selecting one of our I2C expander chips that would allow you to accomplish this: http://focus.ti.com/pdfs/logic/i2cselguide...
    on Aug 1, 2011

  • Forum Post: Multi-Cal-PGA309 Compatibility

    Cassandra Armstrong
    I was wondering if the multi-cal software is compatable with the PGA309 DAQ platform, and if it has the necessary calibration tables.
    on Aug 26, 2011

  • Forum Post: PGA309EVM-USB is losing calibration

    Danilo Carvalho
    Hello, I need to use PGA309 to acquire signal from a strain gauge. To do this I am using PGA309EVM-USB . I tested all functions of this EVM and everything is working well. But in my final test I need to acquire signal with a third acquisition board because the large number of samples. So I disconnected...
    on Sep 19, 2011

  • Forum Post: Re: PGA 309 Question

    Ian Williams
    Hello Paul, The input current at the REF IN /REF OUT pin flows through poly resistors, so accounting for process variation and temperature drift the max variation in spec is ±20%. With a typical value of 100µA the range becomes 80µA to 120µA. Best regards, Ian Williams...
    on Oct 4, 2011

  • Forum Post: PGA309 Checksum Error Event signaling

    Dariusz Knap
    Hello to All!, does somebody know whether it is possible to signalling if PGA309 detects an invalid checksum? In the manual I found the following sentences: "If at any time the PGA309 detects an invalid Checksum1 from the first part of the EEPROM, the PGA309 will disable VOUT , wait for approximately...
    on Nov 10, 2011

  • Forum Post: PGA309 Latching

    Lori Ferger
    I use the PGA309 in a voltage transducer design which is required to pass European Conformity testing (CE). I have taken two designs to a test lab and have difficulties passing the surge testing. The surge requirement is 1000 volts induced onto the power lines. I have designed in extensive circuitry...
    on Dec 2, 2011

  • Forum Post: PGA309 Output Amp with External Gain

    Lori Ferger
    We use the pga309 in several of our circuits with internal gain enabled on the output amp stage. I have designed a circuit which requires the internal gain to be disable and external resistors used. When I disable the gain by setting register 4 bits 12:14 to "111", the output stage rails. It...
    on Jan 7, 2012

  • Forum Post: Re: PGA309EVM RS232, BUT NOT USB

    Ian Williams
    Hello Tenko, I understand your frustration. The RS232 version of the PGA309EVM has been obsoleted, so there are no longer pages on the TI website which contain software or other documentation. I highly recommend that you switch to the new USB version of the EVM. I will be happy to ship you one...
    on Mar 13, 2012

  • Forum Post: PGA309 Good For Correcting Error & Nonlinearity in Systems?

    Andrew Meier
    I recognize that the PGA309 is an outstanding tool for use in correcting error and nonlinearity in a bridge sensor. My question is, is the PGA309 intended to correct for errors and nonlinearity in the actual system that the sensor is measuring? Can it be used this way?
    on Mar 13, 2012

  • Forum Post: Re: PGA309 Generate_Sim_Values.xls?

    Ian Williams
    Hello Andrew, The 'Generate_Sim_Values.xls' file is on the Sensor Emulator EVM product page. Here's a direct download link: http://www.ti.com/litv/zip/sboc065a Best regards, Ian Williams Linear Applications Engineer Precision Linear and Sensing Products
    on Mar 13, 2012

  • Forum Post: Re: PGA309 Linearity DAC: Modelling & Choosing Value?

    Ian Williams
    Hello Andrew, The PGA309 User's Guide contains an entire section (2.6 - Linearization Function) dedicated to the linearization function which gives the design equations, tables of values for typical applications, and several examples which should help clarify this for you. As for modeling the...
    on Mar 13, 2012

  • Forum Post: Re: PGA309 Manually Generated Lookup Table?

    Ian Williams
    Hi Andrew, The lookup table is typically stored on an external EEPROM or in the memory of a microcontroller/microprocessor. It is not a static table - throughout the calibration process new values are written based on the measured sensor input voltages and the calibration calculations that are performed...
    on Mar 13, 2012

  • Forum Post: Re: PGA309 Good For Correcting Error & Nonlinearity in Systems?

    Ian Williams
    Hello Andrew, I've answered your question in this thread: http://e2e.ti.com/support/amplifiers/precision_amplifiers/f/14/t/171535.aspx I appreciate your effort to keep separate questions in separate threads on the forum. However, in the future please try to avoid creating multiple threads about...
    on Mar 13, 2012

  • Forum Post: PGA309 OWB Bit Stuck On

    David McCarty
    I am unable to clear the OWD bit in the external EEPROM. I am also unable to read from or write to the EEPROM. My output is at high impedance and I am reading the reference voltage on the output. I am programming through the ONE wire PRG line and cycling power. TEST pin is pulled low. Therefore...
    on Mar 16, 2012

  • Forum Post: Re: PGA309 OWB Bit Stuck On

    Ian Williams
    Hello David, Is this the same issue you were able to resolve by removing power to the pull-up resistors on the instrumentation side? If so, I will mark this question as resolved. For the sake of completeness, here is the proper PGA309 start-up sequence for OWD=1 mode: Power is cycled on the...
    on Mar 19, 2012

  • Forum Post: Can I download PGA309DK software anywhere?

    David Kerr
    I have an old PGA309DK board, from 2005 or so. Is the software for that still available? Thank you, Dave Kerr
    on Mar 23, 2012

  • Forum Post: Re: Can I download PGA309DK software anywhere?

    Ian Williams
    Hello Dave, The PGA309DK system has been obsoleted and the software is no longer available for download. The PGA309EVM-USB is now the supported version with regular software and documentation updates. Best regards, Ian Williams Linear Applications Engineer Precision Analog and Sensing Products
    on Mar 26, 2012

  • Forum Post: Re: Auto calibration Algoritm

    Ian Williams
    Hello Amir, Thank you for your interest in the PGA309. The attached .zip file contains a document which details the measurements and calculations required for a full calibration. If this is your first time working with the device, I highly recommend using the PGA309EVM-USB to more easily familiarize...
    on Apr 9, 2012

  • Forum Post: PGA309 controlled trough a microcontroler

    Royke
    In our system we are using the PGA309 frontend anr we control it trough a microcontroler with the One-wire Interface. This all works fine, till we enable bit15 register 4 and then disable it again and flash this in the EEPROM. After this the PGA309 does not response to any question. Can't read registers...
    on May 9, 2012

  • Forum Post: RE: PGA309 ADC Conversion Time

    Ian Williams
    Hello Walt, You're welcome. Thank you for your patience while I dug into this issue. I agree that it would be useful to expand on the PGA309 documentation to account for this overhead. Your measurements will be helpful in determining how repeatable the I 2 C initiated, end-to-end conversion times...
    on Jul 19, 2012
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