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Original question:

INA3221: Bus and shunt voltage on a negative rail

INA3221: TIDA-00313: -48V Telecom Current/Voltage/Power Sense with Isolation

John B
Intellectual 325 points
Part Number: INA3221
Other Parts Discussed in Thread: , INA226EVM, TIDA-00313, INA4230, INA4235, TI-SCB

Tool/software:

Hello, 

We need to order this test board. 

https://www.ti.com/tool/TIDA-00313

Kindly let me know how this can be ordered. Thanks in advance. 

  • 0
    Intellectual 325 points

    I guess this is the version of the test board that use triple channel bus and shunt monitor chip INA3221.    

    INA3221EVM: 

    https://www.ti.com/tool/INA3221EVM

    The same board INA3221EVM can be used to test -48 V or -5 V negative power supply.

    Does it comes with programmer hw and also software that work with Windows 10 ? 

    How we can order this evaluation board ?  

  • 0 in reply to John B
    Intellectual 325 points

    I also have a look at INA226EVM. The documentation looks latest from 2023 compared to INA3221EVM from 2012.  

  • 0 in reply to John B
    TI__Mastermind 25315 points

    Hey John,

    The reference design TIDA-00313 is not orderable, but all the design files are available if you want to get it built up yourself. 

    The INA3221EVM does come with with the hardware needed to work with Windows 10, however the EVM does not have an isolator to use with a negative common mode. So, you would need to add that circuitry yourself in between the EVM and the MCU that communicates to the PC. This EVM can be ordered from the EVM webpage: https://www.ti.com/tool/INA3221EVM

    John B said:
    I also have a look at INA226EVM. The documentation looks latest from 2023 compared to INA3221EVM from 2012.

    The INA226EVM has been updated to a new MCU/GUI environment. The INA3221 is on a list to be updated, but has not switched to the new platform yet. If you are generally interested in a newer, more updated environment, then you may be interested in the INA4235 or INA4230 (https://www.ti.com/tool/INA423XEVM). These are newer 4 channel devices, and their EVMs use the new MCU/GUI environment. (Note that those EVMs do not come with the MCU included, as it is ordered separately). Also, to use these EVMs with negative common mode, you will still need to add your own isolation circuitry between the EVM and the MCU. 

    Regards,

    Mitch

  • 0 in reply to Mitch M
    Intellectual 325 points

    Thank you very much for your reply. I will have a look at the newer devices you have mentioned INA4235 or INA4230.

    Among INA3221EVM and INA226EVM, the test board INA226EVM is relatively newer as you mentioned. But both of them don't have isolator circuit to work negative power supply, right ? This need to add separately. 

    I also notice that both INA3221EVM and INA226EVM does not come with SM-USB-DIG platform which need to be bought separately. 

  • 0 in reply to John B
    TI__Mastermind 25315 points

    Hello John,

    Here are my responses to your questions:

    John B said:
    But both of them don't have isolator circuit to work negative power supply, right ? This need to add separately. 

    Correct, neither of these EVMs come with isolation. So, you can try to add it with external circuitry to these EVMs, or make a custom board.

    John B said:
    I also notice that both INA3221EVM and INA226EVM does not come with SM-USB-DIG platform which need to be bought separately. 

    The INA3221EVM does come with the SM-USB-DIG in the EVM box. The INA226EVM does not use the SM-USB-DIG, but instead uses the TI-SCB (https://www.ti.com/tool/TI-SCB). The INA226EVM does not come with the TI-SCB, as it needs to be ordered separately. 

    Regards,

    Mitch