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CC3200 Power up issue

Rohini Dhekale
Prodigy 90 points
Other Parts Discussed in Thread: CC3200

I have developed a customized board of cc3200 for my IOT application. after 2 or 3 days cc3200 stop working.

1. Voltage at crystal 40 MHz is 0 V.

2. Voltage at pin no.38 is 0 V (normally it should be 1.9 V  DC).

is there any lock mode in cc3200?? or is there any problem. 

Plz suggest me solution

  • 0
    TI__Mastermind 33805 points
    Hi Rohini,

    There is no lock mode. Can you please troubleshoot your board to find the specific source of the problem?

    Regards
    Charles O
  • 0 in reply to Charles Oladimeji
    Prodigy 90 points

    hello Sir

    Thank you for your reply.

    CC3200 is not damaged. Our schematic and layout is compatible with your launchpad. 

    as per application of wide voltage mode, 3.3 V DC is given to IC. When we replaced another CC3200 on our faulty board then it works fine. Voltage at crystal and  at pin no. 38 are correct as per datasheet. We think that IC must be in hang or lock mode.  

    Please give me detail about power up stages.

  • 0 in reply to Rohini Dhekale
    Guru 73205 points
    Hi Rohini,

    Did you follow Hardware Design Review Spreadsheet - processors.wiki.ti.com/.../HardwareDesignReviewProcess.zip and processors.wiki.ti.com/.../CC31xx_&_CC32xx_HW_Debugging_AppNote ?

    According my experiences, in case of some weird issue with own hardware, is at most cases reason wrong PCB layout. Requirements for design of power circuits of CC3200 are very strict. For example is almost not possible use 2 layers board with CC3200.


    Jan
  • 0 in reply to Jan D
    Prodigy 90 points
    thank you for Hardware design specification details.
    We have working, 4 layers pcb boards and this problem occurs for 2-3 boards. If it was design or layout problem then, it should have shown problem to all pcbs, but it's not a design or layout problem. So we think it's a IC problem.
    We already have followed all the instructions as per your specifications, and boards are working as per our requirements.
    If we remove faulty IC from board and place a new one then, board works fine. So that we think it as a IC's problem.
    We are now in production phase, so give us solution.
  • 0 in reply to Rohini Dhekale
    Guru 73205 points
    Hi,

    It sounds like problem with IC but this still can be problem with your design. There can be variance of IC parameters and some can work even with not properly designed PCB. Maybe your design can also damage IC at some condition or there can be problem with EMC. There are more options.

    I think you need to contact TI directly to investigate if chips are defective or you have bad design.

    Jan
  • 0 in reply to Rohini Dhekale
    TI__Mastermind 33805 points

    Hi Rohini,

    1. Can you confirm if the replacement CC3200 stopped working under similar operating conditions? 
    2. Also did you try resetting the "faulty' chip? Can you put it back on to see if it works?
    3. Are you running numerous boards and experiencing this problem on only one board?

    There are brown out and black out conditions that happen below certain voltages. Can you check to confirm this is not the cause of the problem. (section 4.5 of datasheet).

    lastly the section 4.11.1 of the datasheet shows the recommended power supply sequence, please ensure this is being done.

    Regards,

    Charles O

  • 0 in reply to Charles Oladimeji
    Prodigy 90 points

    Hello Charles

    Thank you for your reply

    Yes, we are running number of boards and this problem happens on only 2-3 boards. 

    Voltage at RTC crystal is 1.2 V. 

    Voltage at Crystal of 40 MHz, and pin no-38 is 0 V. what possible problem can be?

    please provide me solution

    Thank you and regards,

    Rohini

  • 0 in reply to Rohini Dhekale
    Prodigy 90 points
    On OK board, at RTC crystal voltage is 0.7 V and on faulty board voltage is 0.2 V
  • 0 in reply to Rohini Dhekale
    TI__Mastermind 33805 points
    Hi Rohini,

    I asked a few other questions that are yet to be answered.
    1. We need to know if its an assembly issue on the failing boards, So can you try putting the faulty chips back on to see if it works when reassembled?
    2. The brownout and blackout conditions might be causing a problem, voltage regulation can also be an issue. Can you confirm that you are working in the right voltage range and that the voltage source (ripples and spikes included) is regulated?
    3. Can you provide your layout and schematic diagram for review?

    Regards,
    Charles O
  • 0 in reply to Charles Oladimeji
    Prodigy 90 points
    thank you for your suggestion. I am completely new to this so sorry to bother you this much..
    1.i have checked it by reassembling...
    2. brown out and black out conditions:
    as per datasheet brownout voltage is 2.1 V, and blackout voltage is 1.67 but, I get voltages in between 0.02 to 0.07 V. (please tell me that
    where should i check Vbrown and Vblack voltages,).
  • 0 in reply to Rohini Dhekale
    TI__Mastermind 33805 points
    Hi Rohini,

    The brown out and blackout condition occurs when input voltage is at these levels, so check the input voltage to the CC3200 and make sure it is not triggering these conditions.

    When you reassembled it, did it still fail? is it not coming on at all? what exactly is going on?

    I went through the schematic and you have inductor L15 and 10uF capacitors (C154) instead of 0.1uF. These are not in line with the recommendations.

    Can you provide the power supply section of the schematic containing the WIFI_VCC_3V3 and VCC_3V3 output node?

    Can you also provide your layout for review? In most cases it is something with the layout.

    lastly,are you working with a TI sales person and have you contacted them about this issue?

    Regards,
    Charles