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AM1802: When 1.2V Power up,There is a 1.3V on 3.3V power pin.

Fisher yu
Prodigy 50 points
Other Parts Discussed in Thread: AM1802

When we debug the AM1802,the power sequence is 1.2V->1.8v->3.3V.When the 1.2V power up,we can test a 1.3V on 3.3V power pin. We disconnect  the 3.3V power,the 1.3V still

exist.Remove all the outside devices except the DDR,the 1.3V still on the pin.

6646.AM1802-CPU-SCH.pdf

 

  • 0
    TI__Guru* 84415 points

    Hi Fisher

    The field team has escalated this issue internally and we are looking at it.

    Can you confirm that following

    1) When you say you disconnect 3.3V , can you elaborate what you meant by this, did you remove discrete power ic that sources 3.3V?

    2) Are you suspecting the AM1802 driving a 1.3V on the 3.3V supply?

    3) When you say you removed all components , can you reconfirm that the only thing remaining on the board was the AM1802 and DDR memory?

    4) Do you see a 1.3V on the 3.3V power pins only , or do you also see any voltage level on the 1.8V supply also?

    Regards

    Mukul