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Original question:

AM2632-Q1: AM2632CPDFHMZCZRQ1

AM2632-Q1: AM2632

kerwin ji
Prodigy 70 points
Part Number: AM2632-Q1
Other Parts Discussed in Thread: AM2632

Tool/software:

Hello! I have a question and would like to ask you for an answer. Fault phenomenon: The PCBA has been re-soldered but the software has not been burned in yet. After using 12V power supply, the current is approximately 100mA. The temperature of the AM2632 MCU chip is too high (at room temperature, the temperature exceeds 60℃). Our question is: 1. When the external FLASH of AM2632 is not programmed, does the MCU already have its own program inside? 2. Why is the temperature of the MCU so high? Under what circumstances would this fault phenomenon occur? Currently, the 1.2V, 3.3V and internal 1.8V power supplies of the MCU are all functioning normally.

  • 0
    TI__Prodigy 575 points

    Hello kerwin ji,
    Thank you for reaching out.
    I am working on your query and will get back to you.

    Regards,
    Siddharth

  • 0 in reply to Siddharth Choudhary
    TI__Expert 6710 points

    Hi Kerwin,

    I think this is a question for the Sitara(TM) team, but I have some general comments and questions.

    • Could you tell us why the PCBA was "resoldered?" What was the cause for the original rework, and was this done by a professional shop that specializes in BGA soldering?
    • What about removal? Careful procedure must be taken to not delaminate the solder balls when removing

    Either of these two parts of the process could cause delamination that can cause opens, or improper soldering could cause short circuits.

    In the event either or both things occur, this could cause possible thermal issues from excessive current flow.

    You may also want to check your design in the case that you have unhandled pins that require pull ups or pull down resistors, as some pins may not have the internal terminations or require the embedded software to set these to be used.

    • Is this the only board with this issue, or does it affect more boards?

    Here is a thermal design application note for all Sitara(TM) MCUs.

    Best regards,
    Michael Ly