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INA226: Rsnse and internal reference clarification

Abishek V
Prodigy 175 points
Part Number: INA226
Other Parts Discussed in Thread: INA228, INA229, INA239, INA238

Hi

We are plan to use INA266 IC in our design for to sense 120mA. kindly let us know the Rsense value we can use. In datasheet we are not seeing any design calculations for the same.
Also please let us the know the internal reference range for current sense. If you have any accuracy calculation please share
Thanks and Regards
Abishek V
  • 0
    TI__Mastermind 26525 points

    Hello Abishek,

    Thank you for using the TI forum.  We have a convenient design tool/app note that can help you select the proper shunt resistor based on your system needs, which can be found at https://www.ti.com/lit/an/sboa511/sboa511.pdf. Note that the link to the design tool is in the introduction.

    We do not share the internal reference, but all relevant specifications are in the datasheet. If you are interested in error sources, please see our training series at https://training.ti.com/ti-precision-labs-current-sense-amplifiers-introduction-different-error-sources 

    Also, there is an error calculator tool on the bottom of the product page: 

    One more note is that you may want to look into using the INA228 (I2C) or INA229 (SPI), as these devices have higher accuracy/resolution. If you are looking for a lower cost solution with less accuracy, then you can also look at the INA238 (I2C) or INA239 (SPI).

    Here would be the estimated error for the INA228 with the same settings as above: