Other Parts Discussed in Thread: INA190
Hello,
I want to use the INA190A2-Q1 for voltage measurement of a battery. The idea is to use the following circuit:
By measuring the current in the 1k shunt resistor and determine the cell voltage from that. The cells have a voltage between 2.5V and 4.5V, which translates into a current in the shunt resistor of 25uA to 45uA.
Using 0.1% accuracy resistors and taking offset voltage and bias current of the INA190-Q1 into consideration it seems doable to reach an accuracy of 50nA +/- 1% of reading.
Given it is not the standard use of the INA190-Q1 and that the current measure are quite low, we would like to have your advice on this.
Please let us know if you have any recommendations/ advices,
Best regards,
Jules
