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VCORE too low?

Paul B
Intellectual 810 points

Other Parts Discussed in Thread: MSP430F5529

I'm using a 430F5529 running at 25MHz using a 8MHz crystal.

I use the SetVCore function in HAL_PMM to set the core voltage to 3. I verified the PMMCTL0 register and PMMCOREV is set to 3.

When I measure the voltage on the VCORE pin I get 1.782V. According to the datasheet it should be 1.9V. I have a 0.47uF to ground from the VCORE pin and it looks clean with the scope. The 3.3V power supply looks clean too.

Any ideas what could be causing this?

  • 0
    Guru 92251 points

    Paul B said:
    When I measure the voltage on the VCORE pin I get 1.782V. According to the datasheet it should be 1.9V.

    The MSP430F5529 datasheet only gives a typical Core Voltage for each PMMCOREV level, where the typical voltage is higher in low-current mode compared to active mode for the same PMMCOREV level.

    As the datasheet doesn't give min/max levels it is difficult to determine if the VCORE is "too low". Have you tried increasing the PMMCOREV in steps from 0 to 3 and checking if the measured VCORE voltage increases at each step?

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