Dear Sirs,
My customer test INA233 EVM and get all data from software as attached file.
Does anyone know how to get real data such as current_LSB, VBUS, current.,,, from data?
Thanks.
Hey Peter,
It seems that the INA233EVM GUI presents the bytes of the registers in little-endian fashion. That is to say that it shows you the least significant byte first and then the most significant last. This can be seen with the defualt register values and what was read back.
The LSB for the Vbus and Vshunt measurement are constant at 1.25mV and 2.5uV respectively. I multiplied the decimal code values of the Vbus and Vshunt registers by these LSB values to get the "Physical Measurement". The current_LSB is set by the user by writing to the MFR_CALIBRATION (D4h) register, which the customer has not done yet according to the data.
The readback data of the energy accumulator/reading register (86h) is more involved, but is explained with the following figure from the data sheet.
Hope this helps,
Peter Iliya
Current Sense Applications
