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MSPM0G3519: MSPM0G3218: Information about BuffConfig for VREF

Khanh Doan
Intellectual 280 points

Part Number: MSPM0G3519
Other Parts Discussed in Thread: MSPM0G3218

Hi Ti Team,

I have one question regarding VREF of MSPM0G3218 chip

image.pngAt the moment, I see that we have 3 enable channel for CTL0 of VREF. I configure BUFCONFIG as 0 (output 2p5v) . Then I set ENABLE2 to 1 , I understand that now VREF2 is enabled (I can measure the voltage here using ADC1). If then I set ENABLE1 to 1, I understand that now VREF1 is enabled and connected to internal 2.5V as well.

My question is:

1) Is it possible that I configure VREF1 using external voltage reference, while VREF2 using internal voltage (2p5V) ?
2) What is the purpose of VREF0 in here ? What is the difference betwen VREF0, VREF1 and VREF2 ? I cannot see the difference in the datasheet

  • 0
    TI__Mastermind 24437 points

    Hi, you can refer to TRM: Figure 23-1. MSPM0 VREF Superset Block Diagram for each Vref sub-module.

    Different sub-module should be connected to different peripherals.

    I can confirm the MSPM0 internal Vref - peripherals at my side, but you can test these connection.

    Khanh Doan said:
    1) Is it possible that I configure VREF1 using external voltage reference, while VREF2 using internal voltage (2p5V) ?

    Enable 0 should connect to external pin as Figure 23-1 mentions.

    Khanh Doan said:
    2) What is the purpose of VREF0 in here ? What is the difference betwen VREF0, VREF1 and VREF2 ? I cannot see the difference in the datasheet

    Me too.

    These vref module supports different peripherals, and also internal or external.