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INA237: Layout and Schematic Review for PANW

Rohit Naidu
Prodigy 690 points

Part Number: INA237

Hi Team,

Can you review the following instances of INA237 from Palo Alto Networks and provide comments if anything needs to be adjusted?

U239, U241, U242

Schematic: *removed for privacy

Layout: *removed for privacy

Best,

Rohit

  • 0
    TI__Mastermind 29325 points

    Hello Rohit,

    Here is my feedback for the schematic (also reviewed U240):

    • If measuring very small currents, you may want a cap across the inputs (around 1nF to 10nF), placed physically close to the device.
    • I don't see I2C pullup resistors, so I presume they are on another section of schematic or built into the processor.

    I need to download a newer version of Allegro to view the .brd file, so I will do the layout review tomorrow.

    Regards,

    Mitch

  • 0 in reply to Mitch M
    TI__Mastermind 29325 points

    Hey Rohit,

    For the layout, you will want to change the connections to IN+ and IN- to be Kelvin connections. This is for all the INA237's in the layout, which is the 4 devices mentioned above, as well as U237 and U238. Right now they are just connecting to planes, which will cause errors in the measurement. 

    Regards,

    Mitch