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MSPM0L1306: Shared pin between both OPA drivers

Alexandre Pecher
Prodigy 10 points
Part Number: MSPM0L1306
Other Parts Discussed in Thread: SYSCONFIG

Tool/software:

Hello,

I have a project that requires both internal op-amps (OPA_0 and OPA_1) and the positive input of both OPA should be connected to the same voltage reference.
From the code composer Sysconfig tool, I am not able to select the same GPIO for both positive inputs (PA25).

I got the following error on OPA_1 config : "PA25/29 is currently in use by OPA 0 and is also only available on OPA0 which is in use by OPA 0".

Is this a limitation of the Sysconfig tool ?

Is there a way to use the same pin on both amplifiers in order to keep 1 pin for another usage ?

MCU reference : MSPM0L1306TRGER

Regards

Alexandre.

  • 0
    TI__Expert 8981 points

    Hi Alex,

    If you check the datasheet, you will find that PA25 can only be used as the positive input of OPA0. And the positive input of OPA1 can only be PA18.

    The input and output pins of OPA are analog and have been determined, so they cannot be modified by yourself.

    To achieve what you want, you can connect PA18 and PA25 by hardware.

    Regards,

    Zoey

  • 0 in reply to Zoey Wei
    Prodigy 10 points

    Oh, I didn't noticed that : when I change the +pin on the OPA driver Sysconfig automatically change the OPA peripheral between OPA1 and OPA0. I believed that both pins PA18 and PA25 can be use alternatively but i was wrong.
    Thank you for your help

    Regards
    Alexandre.