Hi all ,
Please let me know how can i realize the Register values into actual current and voltage readings.
To convert RMS register readings to real-world values:
1. Apply a known current input, say 0.45 A rms. Use an ideal source here for accuracy purpose.
2. Note down the register reading, say you get 0xE66665.
3. Find the Amps/LSB constant. 0.45/(15099493)= 2.9802325 * 10 ^ -8.
4. Now when you are using the load, if you measure a particular register reading, say 0x222222, then it means your current RMS value is 2.98012325* 10^ -8 * 0x222222 = 0.06666 A.
Hope this helps!
Every register has a LSB weight that has to be determined first to convert the register readings to real-world values. Gain Calibration has to be done in order to find this. For an initial idea on finding the constant that does the conversion for active power, for eg. Wh/LSB , you can go over a relevant thread ( of another product though, but concept is the same) here: http://ez.analog.com/message/57359#57359
For a detailed step-by-step approach, you can refer to the Application Note AN-1118.
Kindly get back to me if you have specific doubts with the process.
I am not clear with procedure. It would be kind of you , if you can take can example and explain the exact procedure to map IRMSA register to actual current value in Amps.
Eg : My load is drawing 0.45A .
Thanking you in advance.
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