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MSP430AFE221: Need a recommendation for the lowest power MSP 430 family processor.

Bruce Carter
Prodigy 20 points

Part Number: MSP430AFE221
Other Parts Discussed in Thread: BQ27541

Ignore the Part Number above.  We have a new requirement for a very low power microcontroller.  Specific part number is open - our application will be a simple I2C communications translator of three commands.  I don't see it being over a few dozen lines of code, so the processor can be very low end.  No requirement for exact clock rate.  Lowest possible power, especially in standby mode.  We have been using a PIC with 50 nA of standby current, but I believe an MSP430 can beat that, based on the CGM I am wearing with months of shelf life.  Our application is a battery pack, that has to sit on the shelf for months potentially without self-discharge.  I am in contact with the battery management group already so I don't need assistance with that.  I just need a part number, or small group of part numbers of very low power, basic MSP430 processors.  With an emphasis on the lowest power consumption.  

  • 0
    TI__Expert 6845 points

    Hi Bruce,

    Let me conclude your requirements, low end usage and low power is the primary consideration, along with I2C peripherals, please take a look at our low power devices page https://www.ti.com/product-category/microcontrollers-processors/mcus/low-power/products.html

    Please check the low power device like MSP430FR2475 in MSP430 family, moreover, TI has also released new low-power Cortex-M0+ MCU and will provide longer-term better support in the future, you can also take a look at MSPM0L110x series. I'm curious about the 50nA in standby mode of the PIC you mentioned, as this level of low power consumption seems correspond to our shutdown mode. If you have any concern on the low power spec, please also provide the relevant datasheet for our reference, we can use that to make a proper comparison.

    For more professional recommendations, I will reassign your post to the dedicated MSP GPLP team who is responsible for general-purpose MCU and I believe you will get more info then.

    Thanks

    Best Regards,
    Peter

  • 0 in reply to Peter Jiang
    Prodigy 20 points

    The low power products link omits the power consumption!  So if somebody goes to the link needing a quick list of lowest power devices, they are frustrated.  Yes - the 50nA is the standby mode.  Our application is a rechargeable battery pack, which may sit on the customer's shelf for months before being deployed.  It should not self-discharge to a level where the batteries are not recoverable - 2.5V.   I noted 67 nA standby on one of the devices you linked, which puts it in the range of the PIC16LF15354-E/MV.  But I wonder if TI has an even lower standby power option?  

  • 0 in reply to Bruce Carter
    TI__Mastermind 31225 points

    Hi Bruce,

    Is there any expected function need running in standby mode? Maybe just need a wake up function for MCU?

    B.R.

    Sal

  • 0
    Guru 26155 points

    What does it have to do?

    Power under 50nA pretty much requires LPM4.5 which means the device is all but inoperative. Waking it up is basically the same as a power on reset.

    But the power required varies a lot over temperature and voltage. Which makes me think you are taking the wrong approach. A quick search turns up a TI low Iq regulator that is specified to draw just 3nA in shutdown. (You might find something even lower elsewhere.) So use that. Enabling that isn't any harder than making a MSP430 exit LPM4.5.

  • 0 in reply to David Schultz
    Prodigy 20 points

    Another manufacturer suggested an NCP718BSN330T1G, which is 4nA, so if you could give me the TI PN for the 3nA regulator it would be much appreciated.  The whole microcontroller addition was spurred when TI moved the registers that existed on the BQ27541 to different address on their other gauge IC's (GRRR!) which would require us to revise software on several systems that have agency certifications - tens of thousands of dollars and months of delay PER SYSTEM - so we are stuck with translating the old register addresses to the new in a translation microcontroller.  

  • 0 in reply to Bruce Carter
    Guru 26155 points

    Remembering a search I did 12 days ago...

    I got nothing.

  • 0 in reply to Bruce Carter
    TI__Mastermind 31225 points

    Hi Bruce,

    I am not familiar with low Iq LDO. I suggest you can file a new E2E in Power management forum. We have experts to give you the best recommendation.

    B.R.

    Sal

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