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MSP430FR5967: MSP430FR5967 as a power watchdog and power management host

Carl Olen
Expert 1160 points
Part Number: MSP430FR5967
Other Parts Discussed in Thread: MSP430FR5969, , BQ34Z100-G1, BQ25798

Firstly, what is the difference between the MSP430FR5967 and MSP430FR5969?  It looks like the "67" has 1KB of SRAM and the "69" has 2KB.  Is that the only difference?  Are these devices footprint compatible?

Second I'm looking to use the MSP430FR5967 as a host MCU for the bq25798 charger and bq34z100-g1 fuel gauge.  The MCU needs to run a program to send/receive I2C commands to the gauge and charger, turn on/off power supplies with digital I/O (three supplies) and monitor a few signals.  What are your recommendations?  Will this part work as my host MCU?

Thanks,

Carl Olen

  • 0
    TI__Guru 56685 points

    Hello Carl,

    These devices share a datasheet and thus their comparison can be seen in Table 3-1. Device Comparison in the datasheet. See excerpt below.  They come int he same package, and thus are pin to pin compatible. 

  • 0 in reply to Jace H
    Expert 1160 points

    Jace, thanks.  What about the device's suitability as a host for my solar panel/charger/fuel gauge power subsystem?

    Please let me know your thoughts.

    Best regards,

    Carl

  • 0 in reply to Carl Olen
    Expert 1160 points

    Related question: if I have a piece of code that can run on the "69," can it also run on the "67," assuming the size of the program still fits in the allotted memory of the device?  The reason I ask is because I have an EVM Launch Pad for the "69" and I can try getting my code working there first.

    Thanks, Carl

  • 0 in reply to Carl Olen
    TI__Guru 56685 points

    Hello Carl,

    For your launchpad question, its purpose is for initial prototypes and evaluation. So what you are proposing is exactly its use case here of getting everything mocked up in the bigger device, so you could move to smaller device after optimization. 

    For your question about application, from what you have described, this device seems more than adequate of performing the functions you need. I think it will come down to memorize size and if you need to store some lookup tables ordo some data logging of your system. If you don't need all that, then you maybe able to go to a smaller, less performance device as well. that would depend on your analog or compute needs. 

  • 0 in reply to Jace H
    Expert 1160 points

    Jace, thanks.  This gives me enough info to move forward.

    Carl

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