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Part Number: INA220
I want to know worst measurement error of INA220A.
1.Current measurement error
1-1. What's the difference between case1 and case2 ? I think the condition of case1 is unknown.
1-2. Is the worst error of Current measurement the "Current measurement error" ? Does the "Current measurement error" include ADC conversion error and Analog input error ? I want to know anything error factor or not.
2.Bus voltage measurement error2-1. Is the worst error of Voltage measurement the "Bus voltage measurement error" ? I want to know anything error factor or not.
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In reply to user5006534:
I would say it is best to get the worst case error for you conditions. We have some training videos (start on section 2.1) to help with calculation for your exact conditions but there is also an error calculator on the INA220 product page that calculates the RSS error. This is a good start to see how your conditions change your error.
1-1 For case 1 it is at 25°C and case 2 is over the temperature specified. Conditions are listed in the top of the data table unless otherwise noted in the conditions section.
1-2 As you can see (error calculator on INA220 product page) the error will be dependent on the input as VOS is a larger influence with smaller currents. You will also need to include the error of you shunt resistor. The error includes the total error in the measurement at the global conditions listed at the top of the specification table.
2-1 The bus voltage error over temperature is 1%.
Javier Contreras, TI Sensing Products Applications Support
Getting Started with Current Sensing Video Training Series
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