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MSP430 with SD24 for low side bidirectional DC current shunt measurement

Gary Pacey
Prodigy 10 points

I am looking into using a MSP430i20xx family device (need I2C) where one of the channels needs to read a +/- 50mv full scale low side DC current shunt.  I note that the specified common mode voltage of the SD24 channel goes down to - 1.0 volt.

Would a "direct" connection to the differential input of the SD24 suffice or would this application require an external current sense amplifier? An application note or circuit would be appreciated.

  • 0
    Guru 46710 points

    SD24 ADC of MSP430i20xx have built-in programmable gain amplifier. If your current shunt differential voltage lies between -1V and VCC, you don't need external current sense amplifier. SD24GAINx = 16 input range is +/- 58mV.

    Gary Pacey said:
    An application note or circuit would be appreciated.

    It is impossible to prepare application note for any question that could arrive. Yours actually is more or less answered in ADC chapter of datasheet. Indeed there are some MSP430i20xx reference designs that uses current shunt, you are welcome to check those.

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