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CC1101: Abnormal current consumption

Kien
Expert 4021 points
Part Number: CC1101

Hi team,

I am using CC1101 at ~410MHz.

Some modules have very high current consumption: 700mA @3.4V. The transceiver is very hot. However, all the Tx Rx activities are still okay.

I tried to reset the MCU to re-initialize the transceiver but it doesn't help. Only power cycle can help. It happen to some specific module and the issue moved with the ICs when I tried to solder them on another board.

The erratasheet doesn't mentioned any large current consumption.

Please advise what I should further check.

  • 0
    TI__Guru**** 317180 points

    CC1101 shall not use 700 mA in any mode. Since the current consumption follows the chip it's very likely that you have a ESD damage. 

    Have the boards been in a ESD controlled environment at all time?

    Do you have ESD protection on the antenna post (very important if the antenna is accessible by the customer)

  • 0 in reply to TER
    TI__Expert 4021 points

    Hi TER,

    Thanks for your reply. End-users don't have access to the product. This happens in the production line with good ESD consideration.

    If the transceiver was damaged by ESD, why a power cycle can help to remove the issue?

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

    Normally a ESD related high current should not disappear after a power cycle but a ESD induced short is the only thing that could explain 700 mA. 

    If you power cycle, the the high power consumption gone for good or do you see it later again? Does the high current appear in a given mode? 

    Try to measure the impedance from each pin to ground on a good module and an abnormal one and see if the impedance is equal or not. 

  • 0 in reply to TER
    TI__Expert 4021 points

    TER,

    It hardly reproduce the symptom. After hundred of power cycles, some "abnormal" modules don't. Some others do.

    It happens no matter we are using Wake On Radio mode or not.

    Do you think an FA can help to identify the root cause?

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

    A FA will with 95% probability tell you that you have a ESD damage but it will not tell you why and hence not give you that much information. 

    A requirement for FA is to measure the impedances so you should start there. 

  • 0 in reply to TER
    TI__Expert 4021 points

    Thank you. Much appreciated.