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MSPM0L1305: MSPM0L1305 GPAMP_IN+ input missing on 16 WQFN package

Gunther Doewich
Prodigy 10 points
Part Number: MSPM0L1305


Hi guys,

We are evaluating the MSPM0L1305SRTRR (WQFN (RTR) | 16 pin package) and after careful examination of the datasheet, it apears that the positive input of the GPAMP is not exposed on any pins.'

Only the negative input is available on pin 14 and the output on pin 1.

According to section 18.2.5 GPAMP Amplifier Modes on pages 1033 to 1035 of the MSPM0 L-Series 32MHz Microcontrollers Technical Reference Manual (slau847e.pdf), every mode requires the GPAMP_IN+ signal for proper operation.

Since the GPAMP_IN+ pin is not externally available, this would make the GMAMP not useable.

Is this an error in the MSPM0L130x Mixed-Signal Microcontrollers (SLASEX0D – OCTOBER 2022 – REVISED JANUARY 2024) datasheet?

Was the GPAMP_IN+ supposed to be available externally instead of the GPAMP_IN- since this would make more sense (e.g. configure the GPAMP as unity gain buffer via the NSEL mux)?

Screenshot 2025-12-05 155455.png

Cheers,

Gunther

  • 0
    TI__Mastermind 19012 points

    Hi Gunther,

    That is not the case. Sadly this specific package won't have the required pin to allow the use of the GPAMP. However, is there a reason why you can't use the regular OPAs?

    Best Regards,

    Diego Abad

  • 0 in reply to Diego Abad Sajamin
    Prodigy 10 points

    Hi Diego,

    thanks for your reply.

    I would have liked to use the GPAMP as a 1/2 VDD buffer.

    The other two OPAs are already in use for other functions.

    It's just odd that the GPAMP has the output and negative input exposed but since the positive input is missing, the GPAMP can't really be used.

    I would suggest that you either remove the remaining two GPAMP signal descriptions in the datasheet or at least add a note indicating that the GPAMP is not usable in this package.

    I assume you talked to the engineer(s) that designed this part or assigned the pins in this package that the GPAMP_IN+ is really not externally available?

    If you are basing your answer on the datasheet, then we are not any further ahead since the datasheet may have this wrong.

    Cheers,

    Gunther

  • 0 in reply to Gunther Doewich
    TI__Mastermind 19012 points

    Hi Gunther,
    Thanks for your feedback. I'll relay it to my team and we will make sure to make a note about it in the next release of the datasheet. 

    Best Regards,

    Diego Abad