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MSP430F6779A: an AUX1MD be configured to be hardware controlled (AUX1MD = 0) in case AUXVCC1 is connected to DVSS (unused)?

TinK
Intellectual 795 points
Part Number: MSP430F6779A

Tool/software:

Hi,

I would like to consult about AUXxMD configuration since our project has 2 different types of boards below:

Board #1: Connect DVCC pin to DC power supply (3.3 V), Connect AUXVCC1 pin to battery (3.3 V)

Board #2: Connect DVCC pin to DC power supply (3.3 V), Connect AUXVCC1 pin to DVSS (unused)

Since I need common firmware for 2 different types of boards

So can AUX1MD be configured to be hardware controlled (AUX1MD = 0) in case AUXVCC1 is connected to DVSS (unused)?

(note; i have known that in the user guide recommend setting AUX1MD = 1 and AUX1OK = 0)

  • 0
    TI__Genius 9122 points

    Hi, 

    TinK said:
    So can AUX1MD be configured to be hardware controlled (AUX1MD = 0) in case AUXVCC1 is connected to DVSS (unused)?

    Why not try to use a GPIO to read hardware voltage level that indicates whether the device has a backup power supply or a single power supply.

    Regards,

    Helic

  • 0 in reply to Helic Chi
    Intellectual 795 points

    Hi,

    I think in our present code already work.
    by checking AUXVCC1 by the AUX module.

        // Clear the LOCKAUX bit, enable the write access to the AUXCTLx registers
    AUXCTL0 = AUXKEY;
    AUXIE     = 0x0000;                         // AUXIE
    AUXCTL2   =  (AUXMR_0 | AUX0LVL_6 | AUX1LVL_5 | AUX2LVL_0);
                                                // AUXCTL2 �? Auxiliary supply monitoring rate: 0.
                                                //            AUX0LVL : 3.0V.
                                                //            AUX1LVL : 2.7V.
                                                //            AUX2LVL : 0.0V.

    AUXCTL1 |=   AUX2MD;                        // AUXCTL1    Software controlled AUXVCC2 auxiliary supply mode.
    AUXCTL1 &= ~(AUX0MD | AUX1MD);              //            Hardware controlled AUXVCC1 auxiliary supply mode.
                                                //            Hardware controlled AUXVCC0 auxiliary supply mode.



    When Board #2 Connect AUXVCC1 pin to DVSS (unused).
    the AUXVCC1 voltage is 0 v. so the MCU will always switch to DVCC automatically. right?

  • 0 in reply to TinK
    TI__Genius 9122 points

    Hi, 

    TinK said:
    When Board #2 Connect AUXVCC1 pin to DVSS (unused).
    the AUXVCC1 voltage is 0 v. so the MCU will always switch to DVCC automatically. right?

    In TRM: 4.1 Auxiliary Supply System Introduction

    At start-up, automatically chooses between 
the primary supply (DVCC/AVCC) and AUXVCC1, 
based on which one is higher voltage.

    This will be handled by hardware.

    Regards,

    Helic

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