INA226: accuracy excel tools

Hi Gareth,

The only excel tools we offer are the following: 

https://www.ti.com/tool/CS-AMPLIFIER-ERROR-TOOL

https://www.ti.com/tool/download/SBOR021

We also have SysConfig to help with C code: 

dev.ti.com/.../index.html

Please let me know if this is what you were working for or if you had any further questions. 

Best,
Mohamed 

Hi Gareth, 

The INA226 is not precise enough to measure the range of 0.01 to 320A. The best digital device we have for this situation is the INA228, however at 0.01A it may have issue measuring. View this comparison between the INA226 and INA228 using the comparison excel tool:

If this error is too high for you at 0.01A, then you can calibrate out the offset error and it will significantly improve the error at lower currents. If calibration isn't an option, you could consider using 2 shunt resistors, one for high range and one for low range. 

Best,

Mohamed 

Hi Gareth, 

I'm not entirely sure what you mean by basic accuracy, but the gain error maxes out at 0.1%. There are still other error factors to take into consideration. You can learn more about various error sources in our TIPL series: https://www.ti.com/video/6096849204001. The gain(sensitivity) of the INA226 is not 0.2mV/A. Out digital devices do not have a gain, since gain is a certain voltage level output based on the input. Instead, digital devices have an input range and an LSB. Please let me know if you have any further questions. 

Best,

Mohamed