INA233: Asking for the INA233 design review

Hello SHH,

Thanks for reaching out on the forum.  Can you tell me what program your files where created in?  I am having some difficulty opening them.

Hello SHH,

I managed to open the schematic and below are my observations.  All pins look to be within recommended operating range assuming  V33S_MUX is 3.3V or some other voltage at or below 5.5V.

-pins 1 and 2 are connected to ground, an acceptable configuration with I2C address of 1000000

-Pins 3,4,5 all have 10k 5% pull-ups to V33S_MUX. If V33S_MUX is 3.3V then this is fine as its observes the pin absolute max and is above the High-level input voltage minimum

-Pin 6 has the recommended 0.1uF decoupling cap with sufficient voltage rating assuming V33S_MUX is 3.3V

-Without accounting for any mismatch in resistors R7361 and R73207, it looks like the max current your customer can measure with the 0.01ohm shunt at the upper bound of the tolerance is about 8.19A assuming they are operating at room temperature.

-If you want to increase the precision of your measurements you may want to consider filter resistors with even smaller tolerance.

-Accounting for the minimum LSB size with the chosen shunt, the minimum current that can be measured neglecting noise and other error sources is 156uA.

As of now, I still cannot open the layout file, perhaps you could share a picture in the box.

Hi Patrick,
Here is the PADS layout viewer. would you please install this?
s3.mentor.com/.../PADSViewerVX.2.5.zip

BR,
SHH

Hello SHH,

I looked over the pcb layout and I dont see anything that I think would be a serious issue.  However, I was curious as to why your customer has an option for for a bus connection past one of the resistors in the input pi filter.