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TM4C1294NCPDT: Current Consumption in the Hibernate Mode

chandan kumar
Intellectual 440 points
Part Number: TM4C1294NCPDT

Hi ,

I am using EK-TM4C129X Launchpad for one of our requirements.

My question is what is the practical observed current that is consumed when the controller is taken to the hibernate mode ?

When i tested it the numbers came up to 300uA ,which does not matches the numbers mentioned in the datasheet for the hibernate mode with RTC enabled.

I used the example hibernate code that was there in the SDK . Do i need to do any changes in this code or this code works fine for taking the controller to the hibernate mode.??

Thanks,

Chandan

  • 0
    TI__Guru 72500 points
    Where did you measure the VBAT current on the EK-TM4C129X Launchpad? If across JP2, your measurement included Idd and Idda.
  • 0 in reply to Bob Crosby
    Intellectual 440 points
    Hi ,

    Yes i measured it across JP2 .What can be done to make Idda current zero ?

    I can only see the option of of removing the R3 resistor so that reset can be asserted to U20.

    If there is any other option please let me know


    Thanks,
    Chandan
  • 0 in reply to chandan kumar
    Guru 117855 points

    Have you disabled the ADC - placed those MCU pins into their highest impedance mode (i.e. NOT set as ADC) - and (then) made your current measurement?

    In addition - would it not be useful to disable ALL MCU peripherals (not required) during your hibernate state?   (note that firm/I do not use 4C129 & have no knowledge of the sdk code - suggestions presented are thus "general" in nature - and have succeeded w/other (often faster) ARM MCUs...)