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CC1190: CC1190 power down problem

ettore nuti
Prodigy 60 points
Part Number: CC1190
Other Parts Discussed in Thread: CC1352P

Hello everybody,

We are using CC1190 with a 868MHz transceiver for a battery powered device. We're having some cases where CC1190 in power down mode starts consuming power. We have many boards our clients returned us because they started to consume the batteries in a few days while they should last for minimum 2 years. All the boards present the same problem. CC1190 is in power down mode (PA_EN and LNA_EN are set to 0) but it consume several mA. The consumption is not the same for all the boards. If I remove the external inductor that power the output stage we can see the regular consumption of 50uA. So it seems something strange happened that damaged the output stage. How is it possible? Any ideas?

Thanks in advance

Regards

  • 0
    TI__Guru**** 317180 points

    - I assume that you have measured current consumption on boards before you send it to customers to verify that you don't have a design issue.

    - What type of antenna is used? The background for the question is that the pins on CC1190 have limited ESD protection. If the device you deliver to the customer has an antenna that is possible to touch and you haven't included ESD protection close to the antenna connector it's likely that you get ESD issues. You can also measure the impedance from each pin to ground on a working board with a board with high current consumption and see if the impedance for one or more pins is lower on the damaged board. 

  • 0 in reply to TER
    Prodigy 60 points

    - Yes, the boards are verified before to sent they to customers

    - The antenna is inside the plastic box, so is not easy to touch it. The boards were closed in their plastic box and were working normally.

    I removed the external inductor that power the output stage.Than I measured the impedance on pin 2 PA_OUT.  On a board with high current consumption I see 220 Ohm. On an other I see 1,2K Ohm. On a board that work properly I see 1,3M Ohm.

    How is it possible to damage the CC1190 during regular working? How could we protect they?

  • 0 in reply to ettore nuti
    TI__Guru**** 317180 points

    It looks like you have gotten a damage.

    Did you do a production test after you put them in the plastic box? It could that the board gets damaged under production?  I would recommend a ESD diode at the antenna connector, this could be and option: TPD1E0B04DPY1, this is used on the latest CC1352P Launhpads.

  • 0 in reply to TER
    Prodigy 60 points

    Yes, we did test with the boards mounted on their plastic boxes.

    It seems that the damage arise during normal working. How is it possible?

  • 0 in reply to ettore nuti
    Expert 1470 points

    Ettore,

    One way is through antenna mounting. We have seen challenge with some antennas that charged and a ESD pulse when mounting is enough to give damage to a chip.

    I think you have to consider ESD/overvoltage for the complete product lifetime to investigate when this can happen.

    -no more wires

  • 0 in reply to no_more_wires
    Prodigy 60 points

    But our antenna is on board. We don't have antenna connector.

  • 0 in reply to ettore nuti
    TI__Guru**** 317180 points

    Is it possible to provide a picture of how the board is mounted in the casing? Trying to understand the end product.

  • 0 in reply to TER
    Prodigy 60 points

    Schematic and pictures of the board with and without plastic box.

  • 0 in reply to ettore nuti
    TI__Guru**** 317180 points

    If I read the picture correctly: Is the antenna mounted in parallel and very close to the casing? 

  • 0 in reply to TER
    Prodigy 60 points

    Yes, the antenna is parallel to the casing and very close to it.

  • 0 in reply to ettore nuti
    TI__Guru**** 317180 points

    I suspect that since the antenna is long and close to the casing the casing does not attenuate ESD pulses sufficiently before they reach the antenna. 

    You can try  use a ESD diode for C113 to see if you get less issues (as a test to check before you re-spin the board)