Use of SVMH on MSP430

Hi Cora,

Is your question about how to program the MSP430 or how to select a SVS to monitor a 2.8V rail?

Very Respectfully,
Ryan

Hello,

Its about how to program the MSP430.  I am giving the MSP430 3.3 V from a battery and I would like it to shut off when it is receiving 2.8V or less.  I read about the build in SVMH functionality on the MSP430F5529 and I would like to know how to implement this. 

Hi Cora,

In that case I will move your thread to the MSP forum as they will better be able to answer your questions.

Very Respectfully,
Ryan

Thank you!

Hi Cora,

I think this E2E post provides a good example of how to use it: SVM Threshold

Check it out and let me know if you have any questions. 

Best regards, 

Caleb Overbay

It looks like this function does not allow me to set the threshold as high as 2.7 V. Is that correct?

Additionally, in general, how do you disable interrupts and set all interrupt flags to zero?

Hi Cora, 

First I would suggest reading Section 2 of the MSP430x5xx and MSP430x6xx Family User's Guide. This section describes in detail how the Supply Voltage Supervisor and Supply Voltage Monitor operate. A subsection you may want to focus on is Section 2.2.2. You should also check out section 5.22 --> 5.25 in the MSP430F5529 Datasheet  for specific register values that correspond to a particular DVCC voltage.

For your purposes it seems you want to reset the device if DVCC gets below a certain value. To do this you would want to use the SVS instead of SVM. The SVM only monitors the supply voltage and can signal when the voltage gets below a desired level but not turn off the part. 

Also, in the previous E2E post I linked to, the user was able to successfully get things working on the post they made that was dated May 30, 2011 7:46 AM, so I would use that code as a base. 

Finally, there is no way to universally set all interrupt flags to zero. You can disable all interrupts in your system with a call to __disable_interrupt();. Remember though that if you want to use interrupts after disabling them, you need to re-enable them with a call to __enable_interrupt();.

Best regards, 
Caleb Overbay