• State Resolved
  • Locked Locked
  • Replies 2 replies
  • Subscribers 79 subscribers
  • Views 1748 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

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.

MSP430FR6877: Critical Increased Current Consumption

Ted Huh
Intellectual 2490 points
Part Number: MSP430FR6877
Other Parts Discussed in Thread: MSP430FR6989

Hi,

This is very urgent & important issue.

Customer built ultra low power system with MSP430.

They wanted to use MSP430FR6877. so TI provided MSP430FR6989 as a sample.

when they built a system with FR6989, in LPM3, the current consumption was 10uA.

However, When they used FR6877 on exact same board, the current consumption increased to 80uA.

It is right before MP, but this issue is too critical to start MP.

Is there any particular reason for this increased current consumption?

FR6989 is Rev E and FR6877 is Rev C. if they apply FR6877 Rev C, will this problem gone?

All other functions works fine but increased current consumption is the only problem.

Best Regards,

Ted

  • 0
    Guru 263190 points
    There are some different pins (the FR6877 has no ESI). Was this observed in the board design?
    The memory sizes and peripherals are different. Was the MCU type changed appropriately when compiling?
  • 0 in reply to Clemens Ladisch
    TI__Guru 56685 points
    Hello Ted,

    As Clemens suggested there are some pin differences between the devices. A schematic review would need to be done in order to ensure everything is correct. I will contact you offline to do this.

    Also as Clemens suggested, has the program been compiled correctly for the current chip? The same binary will most likely work for both, but some differences due exist that could cause excess current consumption. One area of particular interest is what the customer is doing with unused pins. Are they following the guidelines outlined within the user guide?

    How are they measuring the current consumption? Are they measuring the current going into their board? or do they ahve a break int eh circuit at DVCC by the MSP430 to ensure they are only measuring MSP430 current?

**Attention** This is a public forum