FAQ: Synchronizing Data Capture with ADIS16485 Power-on

Document created by NevadaMark Employee on Mar 13, 2016
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Q:

Will the EVAL-ADIS and IMU Evaluation Software enable capture of the first data sample that the ADIS16485 produces after it powers on?

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A:

Yes, with the use of an external supply and some quick button pushes, these evaluation tools will support this.  Here are the steps, with supporting pictures:

  1. Get the IMU Evaluation software running and verify that the ADIS16485 is working with the USB-based, +3.3V supply.
    EZ_FAQ_485_EVAL-PwrOnSync_00.PNG
    EZ_FAQ_485_EVAL-PwrOnSync_01.PNG

  2. Go into the Data Capture Menu
    EZ_FAQ_485_EVAL-PwrOnSync_02.PNG
  3. In the Data Capture window, select the registers for data acquisition, the total number of samples to collect in the record and the file name/path, but DO NOT click on Start yet.
    EZ_FAQ_485_EVAL-PwrOnSync_03a.PNG
  4. Change the JP1 jumper setting on the EVAL-ADIS to "Ext," as shown in the following picture:
    EZ_FAQ_485_EVAL-PwrOnSync_03.PNG
  5. Connect an external supply to J3, as shown in the following picture.  NOTE: These power inputs have no transient or reverse-polarity protection.  The ADIS1648x products place transient current demands on VDD during start-up.  Reference product datasheet for more details on the transient demands.  Make sure that the supply, at J3, does not experience excessive overshoot (VDD < 3.6V peak) and is correctly oriented.
    EZ_FAQ_485_EVAL-PwrOnSync_05.PNG
  6. In the Data Capture window, click on Start, then turn the +3.3V supply on.  Between the time that you click on Start and the first data sample must be less than 5 seconds.
    EZ_FAQ_485_EVAL-PwrOnSync_06.PNG

I hope that this helps and look forward to your comments!

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