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LPF1 pin on cc1121 was broken

Kaka
Guru 24520 points
Other Parts Discussed in Thread: CC1121

Hi TI Experts,

Please let me confirm my question.
[Question]
Have you ever seen the phenomenon to be broken the LPF1 pin on CC1121?
Our customer said that CC1121 was broken by repeat with replacing a battery work of system. So, we confirmed whether this device was broken, it was damaged the LPF1.  If possible, would you please show us the assumed cause?

If you have any questions, please let me know.
Best regards.
Kaka

  • 0
    Guru 24520 points
    Would you please answer for this topics?

    Best regards.
    Kaka
  • 0 in reply to Kaka
    TI__Mastermind 27145 points
    Hi,How did they determine LPF1 was broken?
    Was it a electrical failure or a physical damage?Thanks,PM
  • 0 in reply to PM
    Guru 24520 points

    Hi,

    We measured the electrical specification of between the pins. As a result, it seem that those devices were shorted to GND by electrical failure because there was not a physical damage on those devices by checking the package.

    Best regards.
    Kaka

  • 0 in reply to Kaka
    TI__Guru**** 317180 points

    - Why did you suspect a failure in the first place?

    - Have you checked the impedance on a working part?

    I find it unlikely that the LPF1 pin is damaged since this is only connected to a cap.  

  • 0 in reply to TER
    Guru 24520 points

    Hi TER,

    I answered your questions as below.
    > Why did you suspect a failure in the first place?
    [Kaka]
    Their system did not work. So they checked whether the MCU confirmed that there was a response from CC1121. But there was not any responses from CC1121.  So, we checked the electrical specification of between the pins by using curve tracer. I attached the result as below.

    - Have you checked the impedance on a working part?
    [Kaka]
    No. We did not check them.


    I agree with you opinion as below.
    > it unlikely that the LPF1 pin is damaged since this is only connected to a cap.
    So, we do not have any idea for this cause.
    Best regards.
    Kaka

  • 0 in reply to Kaka
    TI__Guru**** 317180 points
    - Is the voltage on the DCPL pins 1.8 V?
    - Is the voltage on the RBIAS pin 1.2 V?

    They are on the right track debugging wise. They should measure the impedance to ground from all pins for both a working an not working chip and see if the impedance on the not working sample is different from the working one.
  • 0 in reply to TER
    Guru 24520 points
    HI TER,

    Thank you for your response.
    I will confirm your questions to my customer. If I get the feedback from them, I will update.

    By the way, do not you have the data of the impedance to ground from all pins for non-defective device?
    I think that you have this....

    Best regards.
    kaka
  • 0 in reply to Kaka
    TI__Guru**** 317180 points
    No, we haven't made a table of the impedances to ground.