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MSP430FR6047: Supply voltage

Behnam Madadnia
Intellectual 350 points
Part Number: MSP430FR6047

Tool/software:

Dear Engineers,

In the CCS software there is a part which is called Ultrasound sensing academy related to MSP430, in one of the parts it is mentioned that it is best to put the supply on EXT, which is a battery to reduce the noise. They suggested to connect 3.3 V as the power to the system. 

In our finalize design we want to apply a long-life battery as the supply voltage, but the issue is that the voltage of such batteries is 3.6 V not 3.3 V, would you please let me know if we still can connected 3.6 V directly to MSP430FR6047?

The recommend voltage is as follows for MSP430FR6047:

Best regards,

Behnam,

  • 0
    TI__Mastermind 28070 points

    Hi Benham, 

    You will not see damage to the device, as the absolute maximum for this device is 4.1V, so technically you can use 3.6V to supply it. Just be aware that if you are using a battery directly the voltage will change as the battery charge drains and as current is drawn, which means its not a particularly stable reference.

    At 3.6V you also wouldn't have much margin on our recommended operating conditions, which if you are above those you can see out of spec behavior. 

    Best Regards,
    Brandon Fisher

  • 0 in reply to Brandon Fisher94
    Intellectual 350 points

    Dear Brandon,

    Thank you very much for the accurate explanation. If I want to add a regulator, I will lose a bit of power in the regulator to covert my voltage to 3.3 V from 3.6 V, an this conversion should happen constantly and permanently. I should mentioned this, that we are designing  an ultra low power meter, so consumption is critical for us. So, would you please let me know if there is an option to use the regulator and not losing power (heat dissipation,...)? ( even uA consumption matters in our design).

    Regards,

  • 0 in reply to Behnam Madadnia
    TI__Mastermind 28070 points

    Hi Benham,

    No regulator would be 100% efficient, so yes, you would lose some power doing this. 

    You may wish to create a related post in the power management forums to try and get a recommendation on a regulator/buck that could maximize your efficiency. 

    Best Regards,
    Brandon Fisher

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