• State TI Thinks Resolved
  • Locked Locked
  • Replies 3 replies
  • Answers 1 answer
  • Subscribers 46 subscribers
  • Views 393 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

Original question:

ADS8900BEVM-PDK: ADS8900BEVM-PDK is not getting powered up(only PHI is getting powered up)

ADS8900BEVM-PDK: ADS8900BEVM-PDK is not getting powered up(only PHI is getting powered up)

Yuri Davydov
Prodigy 20 points
Part Number: ADS8900BEVM-PDK
Other Parts Discussed in Thread: ADS8900B

I have connected to the ADS8900BEVM-PDK board via the PHI controller,I have the installed the relevant GUI from the TI website.
When jumper J2 closed - I havent problem.I can get results with sensor.
But When J2 is open - only the PHI is powered up,the evm board is not powered up and no led glows on EVM board. The board is disconnected both from the sensor connection as well as arbitrarily.
Another jumpers dont change situation.

When J2 closed i have measurements by multimeter in tested point:
DVDD (TP5) -1.75V;
TP6 - 3.3V;
In 5.5V(TP1), 5.2V(TP7), OUT_REF(TP4) - i havent required voltage.
If you look at the layout i can say that problem started after R19(after point "EVM_REG_5V5")

I havent problem with GUI and drivers for GUI because I get results on GUI, problem in disconnect the board.

Could you suggest possible solutions to the problem?

Thank you in advance!

  • 0
    TI__Mastermind 36240 points
    Hi Yuri,

    Typically, when the ADS8900BEVM does not power up correctly, it is a bad connection between the board and the PHI. The position of jumper J2 (open or closed) should not cause this behavior.

    Did you install the two screws as shown in Figure 8 of the ADS8900BEVM-PDK User's Guide?

    I have had instances where the two boards appeared to be connected, but either the ADS8900BEVM would not power up, or it would power up, but there would be no communications between the ADS8900B device and the PHI board. In both situations, I did not install the screws. After installing the screws and reconnecting the EVM to the PC USB port, everything worked correctly.

    Please let me know if this helps.

    Regards,
    Keith N.
    Precision ADC Applications
  • 0 in reply to Keith Nicholas
    Prodigy 20 points

    Hi Keith,

    All screws were installed, but unfortunately did not help.
    However, instead of R19, I tried to connect an external power supply of 5.5 volts. And I have not yet observed the outages.

  • 0 in reply to Yuri Davydov
    TI__Mastermind 36240 points
    Hi Yuri,

    It sounds like you have a working solution. The 5.5V supply on TP1 is limited by the PHI board to ~120mA, which is enough to power the evaluation board. However, if you have additional loads on this supply, it could cause the overcurrent limit to trip.

    Please feel free to reply to this post if you have any more questions.

    Thanks!
    Keith N.
    Precision ADC Applications