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INA219: LSB question

Part Number: INA219
Other Parts Discussed in Thread: INA226, INA230, INA233, INA231

About INA219, LSB is 10uV.

The LSB of current is 10uV/10mOhm=1mA and the LSB of power is 1mA*8.5V= 8.5mW, right?

We need the LSB of power less than 0.1mW.

Could you please recommend the INA LSB less than 0.1uV? THX.

  • Hello HungChe,

    Thanks for your interest in our current sensing products.  Unfortunately, all of our digital power monitor devices have a shunt Voltage LSB size larger than 0.1uV.  The lowest shunt voltage LSB we offer is 2.5uV.  This can be found in the INA226, INA230, INA231, and INA233.  If you can compromise on your shunt resistor value though, you can potentially get better power resolution.  Alternatively, you might consider getting an analog output solution that can feed into a separate ADC to get better resolution.  However, understandably this would require more board space and also could be more expensive.