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CC1310: uLDO is not working

Udarshan
Prodigy 50 points
Part Number: CC1310

Tool/software:

Hi,

 

We have a product based on CC1310, and we’ve observed that around 10% of the produced devices enter a deep sleep mode and become unresponsive. 

Upon further investigation, we found that while in deep sleep, the microcontroller unit (MCU) switches to the ultra-low dropout regulator (uLDO), which is not supplying power to the MCU. 

 

When we measured the DCOUPLE pin, the working boards showed a proper voltage of 1.28V. In contrast, the failed devices either had a reading of 0V or around 2.68V.

 

In which scenarios can CC1310 uLDO be dead? some direction will be helpful in narrowing down the root cause

  • 0
    TI__Genius 17945 points

    Hi,

    Please can you measure the resistances of the device pins (to ground) with a multi-meter, with the IC powered off, comparing a known good unit and a sample of the failed devices?

    Did the failed devices never work, or was the failure observed after some time?

    Additionally, please output the 32 kHz clock to a DIO/Pin to check if it is running. This can be done by following Section 11.3.4 of the SWCU117 (CC13x0, CC26x0 SimpleLink Wireless MCU Technical Reference Manual): https://www.ti.com/lit/swcu117

    Regards,

    Zack