MSP430FR2532: Running with 1.8V supply

John Elliot

Hi All,

Sorry if this has been addressed before for this part. I've been having trouble getting my system to run with a 1.8V supply. I tried to disable the SVS in my code. Still no luck getting it to boot at 1.8V, but everything is fine 1.9V and above. After a little more digging, my understanding is that the SVS is active by default and the power supply must exceed 1.9V to start up. At that time my code will run and disable SVS. but with my 1.8V regulator powering the part I’m screwed because the SVS will not let the part out of reset.

Is my understanding correct? If it is correct, how can TI claim that this will support a supply voltage of 1.8V if it will never come out of reset? Unless you boot at a higher voltage and then drop down later, but it still seems misleading...

Thanks,

John

over 8 years ago

0 zrno soli over 8 years ago

Guru 34973 points

Yes, you are right. FRAM devices needs min 2.0V for start up, and later they can work at min 1.8V. Why this is not clearly noted on first page of each device datasheet? I believe that this is because of the same reason, why on the first datasheet page there is no mention of FRAM wait state. Commercial reason.

0 John Elliot over 8 years ago in reply to zrno soli

Prodigy 20 points

Thanks for your feedback. I think you are correct. A friend of mine is claiming that once it is programmed it will keep the SVS off and work at 1.8V. Is he totally out to lunch? Any one else who has seen this work?

0 Xiaodong LI over 8 years ago in reply to John Elliot

TI__Mastermind 25425 points

SVS is enable by PMMCTL0.SVSHE default value 1. SVS can be disable after device power on. but SVS is enable once device reset.

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MSP430FR2532: Running with 1.8V supply