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MSPM0G1106: What is the current consumption when 1MHz is output by SYSOSC?

K.Z
Expert 2540 points
Part Number: MSPM0G1106
Other Parts Discussed in Thread: MSP430FR2110

Tool/software:

Hi All,

Our customer is considering using SYSOSC to generate the main clock at 1 MHz with an accuracy of ±1.2%.
We would like to know the actual measured current consumption and accuracy in this case.
My target value is 200~250µA in Run mode.
The volume is very high, 1250K, so we need your help.
The following are the conditions.

・VDD = 3.3V
・SYSOSC→MCLK(4MHz→1MHz)
・Accuracy within ±1.2
・Temperature: 25°C (room temperature)
・All peripherals are not used.
・RUN MODE
・FCL enable

If 200~250µA is difficult under these conditions, we are also considering specifications for less than 3.3V (e.g. 2.0V).
Please let us know up to what voltage is possible.

Best Regards,

Ito

  • 0
    TI__Genius 9095 points

    Hi Ito,

    I tested the current consumption under the condition you mentioned:

    • MCLK = SYSOSC(4MHz)/4 = 1MHz
    • VDD = 3.3V
    • ECL enabled
    • Active mode, runing " while(1) {}"

    And the current is around 440uA (measured by Engergy Trace):

    As I decrease the supply voltage to 2V, the current does not decrease too much (measured by voltage/resistor).

    It seems that it's difficult to meet customer's requirement of "200~250uA" active current.

    Here are some other proposals:

    1. Is 400~450uA current acceptable for customer to run their system?

    2. You could  recommend customer to use our low power mode when there is no task to run, which could get uA level current consumption when disable CPU and CLK running. And it could lead to a current consumption less than 200uA in average. Please check with customer about this proposal.

    3. By the way, MSP430 has a great low power performance in run mode. MSP430 may also be a good option for customer's requirement.

    Regards,

    Pengfei

  • 0 in reply to Pengfei Xie
    Expert 2540 points

    Hi Pengfei,

    Thank you for your reply.

    Under the same conditions, what would the current be if tested on an MSP430FR2110.

    Best Regards,

    ito

  • +1 in reply to K.Z
    TI__Genius 9095 points

    Hi ito,

    The current of MSP430FR2110 under 1MHz in active mode could refer to its datasheet:

    When program is running from RAM or the cache hit ratio is high enough (maybe higher than 75%), I think the requirement of 200-250uA could be satisfied. 

    By the way, what is the application of the customer? Will MCU work in active mode all the time? I still think the low power mode of MSPM0 could be considered to get a low average power to meet this requirement. 

    Regards,

    Pengfei

  • 0 in reply to Pengfei Xie
    Expert 2540 points

    Hi Pengfei,

    Thank you for your reply.

    I can't speak for the customer's application, but it needs to be Active at all times,
    and I will ask them to consider if Sleep Mode is available. I will get back to you when I have updated information.

    Best Regards,

    Ito