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MSPM0L1305: MSPM0L1305

KR BEE
Prodigy 20 points

Part Number: MSPM0L1305
Other Parts Discussed in Thread: LP-MSPM0L1306

Tool/software:

Can we use internal Vref as internal OPA non-inverting input?

  • 0
    TI__Mastermind 23497 points

    Please refer to datasheet https://www.ti.com/lit/ds/symlink/mspm0l1305.pdf

    Figure 8-1. Analog Connections

    and TRM www.ti.com/.../slau847d.pdf

    18.2.3 Analog Peripheral Interface

    VREF to OPA
The OPA peripheral can leverage the external reference for setting a voltage bias on the noninverting input
terminal of the amplifier using the PSEL control bits in the CFG register.

  • 0 in reply to Helic Chi
    Prodigy 20 points

    Hi, according to the datasheet. It is possible to configure the Vref to non-inverting input. 

    I am using LP-MSPM0L1306 launch pad and I tried to configure the OPA non-inverting input in system config but it shows '' the selected device is not support sourcing internal Vref ''? 

    Please find the attached image.

    Appreciate if you can guide me on how can I configure it in code composer studio..

  • 0 in reply to KR BEE
    Prodigy 20 points

    is there ways that I can still use internal Vref for my op-amp non-inverting input?

  • 0 in reply to KR BEE
    TI__Mastermind 23497 points
    KR BEE said:

    Hi, according to the datasheet. It is possible to configure the Vref to non-inverting input. 

    I am using LP-MSPM0L1306 launch pad and I tried to configure the OPA non-inverting input in system config but it shows '' the selected device is not support sourcing internal Vref ''? 

    This is mentioned in TRM as my reply above:

    VREF to OPA
The OPA peripheral can leverage the external reference for setting a voltage bias on the noninverting input
terminal of the amplifier using the PSEL control bits in the CFG register.

    You can set Vref in external mode, using external vref input to Vref+, then connect internal vref to OPA input.

    KR BEE said:
    is there ways that I can still use internal Vref for my op-amp non-inverting input?

    Set Vref in internal mode, such as generate 1.4V or 2.5V, there will be a voltage reference 1.4/2.5 at Vref+ pin.

    Then connect PA25 to OPA input pin externally.

    You can have a try.

    There maybe some reason that M0 can not support connect Vref 1.4/2.5 to OPA input internally, but I can not get related information from Datasheet or TRM.