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TIDA-00601: Shunt Resistor Value

Part Number: TIDA-00601
Other Parts Discussed in Thread: AMC1304M05

Hello TI Team,

We are developing a energy meter over your reference TIDA-00601 Shunt Resistor Design.When we look to Reference Source Code,we can not find a variable or definition for shunt resistor value.

when we use different value shunt resistor, what should we do?

Best Regards,

Candan

  • Candan,

    Thank you for reaching out. The MSP430-Energy-Measurement software is agnostic of shunt value. The software must be calibrated when first running a system which will correlate the shunt voltage measured by the ADC to the known current applied to the system during calibration. See Section 7 of the TIDA-00601 User Guide.

    It is important when selecting a shunt value to consider the maximum voltage that will be seen across the shunt in your system. The ADC measuring the shunt voltage for current measurements in TIDA-00601 is the AMC1304M05, which has a +/- 50mV input range. You should make sure that the voltage drop across your chosen shunt at the maximum current spec of your e-meter does not exceed this range to ensure maximum accuracy.

    Please let me know if you have any further questions.

    Regards,

    Ben Uhing