Hi Sir,
My customer would like design INA219 to replace INA233 due to cost reason. INA233 was used for previous project.
Would you please review schematic/ layout and provide your comment?
four current steps.
Step1à20V/0.25A
Step2à20V/0.5A
Step3à20V/0.75A
Step4à20V/1A
BR,
SHH
Hello SHH,
I will note one mistake in the schematic. R7127 and R7132 should be 0-Ω resistors. The device may not work if the address pins are not pulled with 0-Ω resistors.
The input sense voltage range is 2.5mV to 10mV with 10mΩ shunt. This range easily works with both and many other devices.
The schematics look fine, but I am having trouble with layout. Could you please send screenshots of the current sensors and shunt resistor circuitry? As long as the recommended layouts are practiced then this should work fine. Although there is not much to go off on without knowing the max possible common-mode voltage at inputs (how high can +20V_DS rail be? The INA219 is going to have higher error because of it less accurate offset and gain error specs. Please address the error allowed in your system and check if the INA219's specification will be compatible.
Another difference is that the INA219 does not support the PMBUS interface and has a different register set so some host device firmware will need to be different.
Consider learning about determining error for all of our devices using our training videos here.
Sincerely,
Peter
