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MSP430 for measuring line power?

Andrew Dupree
Prodigy 40 points

I want to use an MSP430 in a power meter type application. I found this block diagram in one of the MSP430 brochures:

Can someone explain to me how the MSP430 is measuring the current and voltage running through the power lines depicted here? Specifically:

I understand that the Sigma Delta pins are ADCs. What is the effect of the two resistors shone near the Vsense input? Are they just to limit current into the MSP430?

How is the I-sense depicted working? What does the blue buffer represent - a separate IC? Or is this some built-in functionality I'm not following?


Thanks.

  • 0
    Intellectual 625 points

    For sensing Current ( I sense) there is some shunt resistance used to find out the current flowing through it.

    And voltage sensing is through the voltage drop down resistors shown in the picture.

    the correct implementation of this is given below links .

    http://www.ti.com/lit/an/slaa203c/slaa203c.pdf

    http://www.ti.com/general/docs/litabsmultiplefilelist.tsp?literatureNumber=slaa203c 

    hope it helps

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