• State Resolved
  • Locked Locked
  • Replies 2 replies
  • Answers 1 answer
  • Subscribers 79 subscribers
  • Views 153 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

MSP430FR4133: Abnormal power consumption on a batch marked 29A9RQT

Romanelli Diego
Prodigy 10 points
Part Number: MSP430FR4133


Tool/software:

We have developed a simple board which uses an MSP430FR4133 with an LCD, two switces, a sensor and a few other lines.

The firmware has been developed so that the current consumpion is below 5uA  (the device should be battery powered), and tested on chip with batch code 24A3XRT-B

Then we assembled other samples with chip with batch code 29A9RQT-B but have an abnormal current consumption  of 70-90 uA with the same firmware and HW..

We also measured a different current in case of no-programmed chips (~80 uA vs <1uA)  

I cheched also the whole register set to see if there is some different default reset values, which can cause a different behaviour.

At this link the  circuit  No floating pins are present.

I would think to defective or counterfeit chips, but since they were bought on Digikey I do not want assume this ipotesys. 

Thanks to who will give me some piece of advice on this problem.

Diego

  • 0
    Prodigy 10 points

    Interesting update! I solved the problem by enabling the pull-up resistors on Port 8, which is not physically bonded out on the device package.
    This suggests that even unbonded ports must be properly configured, as some MCU batches may exhibit different behavior if left floating.

  • +1 in reply to Romanelli Diego
    TI__Mastermind 29105 points

    Hey Romanelli,

    That's a great find.  When I was reading your post, it instantly sounded to me like the current was from floating pins but I think it would have taken a little while for me to consider the ports not bonded out on your specific package.  Does make sense though.  

    Sorry for the delay from my side but glad you were able to solve this case yourself.  Hope the rest of your production with FR4133 goes well.  

    Thanks,

    JD

**Attention** This is a public forum