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MSP430F5438A-ET : What is total current value?

Dahun Kim
Prodigy 150 points
Other Parts Discussed in Thread: ENERGYTRACE

Hi, TI

I'm looking for the total current values in active mode.

On Active mode, In datasheet

I_AM_Fash + I_AM_RAM =  Core 0~3  = 2.30 + 3.1 + 6.37 + 14 +1.1 + 1.47 + 2.82 + 8 =  39.16 mA  

or

I_AM_Fash + I_AM_RAM =  Core 3 = 14 + 8 = 22 mA 

Which one is correct?

  • +1
    TI__Genius 9970 points

    Hi Dahun Kim,

    I assume you are looking at Table 7.3 in the datasheet. To read the table first determine the clock frequency you wish to run at (ex: 25MHz) then determine the PMMCOREV setting (ex: 3). With my example I would use the values in blue to determine the typical power figures and the values in red to determine the max power figures, see below:

    So for example typical power in active mode = 8.9mA + 4.5mA = 13.4mA

    However, if you are concerned about power consumption for your design you will want to take advantage of low-power sleep modes. You may also want to look into EnergyTrace to understand the power consumption of your code.

    Here are some resources:

    https://training.ti.com/msp430-workshop-series-7-12-low-power-optimization

    https://www.ti.com/tool/ENERGYTRACE

  • 0 in reply to Evan Lew
    Prodigy 150 points

    Hello, Evan lew.

    Just now, I read your writing.

    I don't use Low power system. 

    Can i ask you one more question? It's a question about the cores. 

    For example, Can I use the 8MHz core  from 0 to 3 at the same time? 

    I will use mcu with I2C 2ea, RS232 2ea.

    Anyway, Thank you for answer !

  • 0 in reply to Dahun Kim
    TI__Genius 9970 points

    I'm not sure what you mean by "at the same time". If you look at the table, all PMMCOREV values are available at 8MHz. Only one PMMCOREV settings applies at a time. PMMCOREV configures the core voltage of the CPU. High voltages allow for faster clock speeds (which is why 25MHz requires PMMCOREV=3) but lower voltages save power.

    Hope that makes sense.

    Evan

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