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PGA411Q1EVM: A few issues

user5009628
Prodigy 50 points

Part Number: PGA411Q1EVM

Hi, I  get some issues when i learn using the PGA411-Q1 EVM,  expect for your help. as follows:

1、the output pin ORS has no signal

IN the GUI, whether  i set the XEXT_AMP 0 or 1, the ORS pin always outputs 1.8;  when i   set the XEXT_AMP 0，the OEX can output normal sine wave. why?

2、How the PGA411 switch from dignostics to normal

In the GUI,when i  set SPIDIAG=1,the PGA411 enters into diagnostics. while i read the DEVSTAT7,i find the device keep dignostics state from then on,it keep dignostics state unless i set DIAGEXIT=1。I am puzzeld ,when the device enters into dignostics state ,and perform over the dignose work, why it doesn't switch to normal state?

3、clock 

The OSC reads the EVM ECLKSEL Pin 0V,but the EVM sch diagram show it has a external clok circuit。I am puzzeld  the device use which clock on earth, internal or external?

 Expect for your reply,thanks!

 

  • 0
    Prodigy 50 points
    One more question, the device datesheet saids, when the device being on diagnostics state, the Boost=OFF,but i find the Boost is working normaly;
    The DTL=OFF and Exciter=OFF by setting the EXTEN=0,LPEN=0,but i find when i only set the LPEN=0, the Exiter=OFF。 why？
  • 0 in reply to user5009628
    TI__Mastermind 23810 points
    1.) Let me look into this a little more. The ORS pin is only used if you need to use an external amplifier instead of the integrated one. You might use this if you need to drive more than 145mA of peak current.
    2.) The device enters diagnostics mode when it first powers up and will switch to normal mode once it finishes with ABIST/LBIST. After that, if you manually enter diag mode, then the device will remain in diag mode until you tell it to exit and go back to normal mode.
    3.) That pin is controlled by the MCU. There is an option to change this in the GUI by going to the "pin configuration" page. I recommend using ECLKSEL = high to use the external crystal.
  • 0 in reply to Clancy Soehren
    Prodigy 50 points

    Thanks for your accurate and passionate  answers and i am looking for the remaining 2 .  Thanks!

  • 0 in reply to user5009628
    TI__Mastermind 23810 points

    My apologies for the delay. For your first question, the ORS pin or the OEx pins will be active at one time. The XEXT_AMP selects between the two options. They will not both be active at once.

    Let me know if you need anything else.

    Thanks,

    -Clancy