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MSP430FR2433: How to optimize power consumption

Cruijff
Expert 2760 points
Part Number: MSP430FR2433
Other Parts Discussed in Thread: ENERGYTRACE,

Hi community member,

In the MSP430FR2433 LaunchPad, I measure the current when operating with LPM3 with EnergyTrace. The result is 18.7 uA, but it deviates significantly from the value stated in the data sheet. (1.13 uA)

<Evaluation criteria for MSP430FR2433 LaunchPad (SLAU739 October 2017)>
・ J101
5V jumper off
UART jumper off

・ J10, J11 jumper OFF

・ Without using a crystal oscillator (32.768 kHz)
I am using the built-in oscillator (REFO or VLO).

How can I reduce the consumption current at LPM3 to the value of the data sheet?

Best regard.
Cruijff

  • 0
    TI__Guru 60361 points

    Hi Cruijff,

    According the MSP430FR2433 datasheet, pg 24, the REF0 current is about 15uA, which would explain the bulk of the error you are seeing.

    What are you doing with the IO pins?  Any unused pin should be configured as output and driven low.

  • 0
    Guru 88700 points
    From your description, ACLK is running with REFOCLK which, as Dennis mentions, takes 15-20uA. The FR2433 doesn't allow you to assign ACLK to VLOCLK. If you don't have a crystal you can't assign ACLK to XT1CLK.

    But if you're not using ACLK, try LPM4, which is just LPM3 + ACLK turned off. [Ref UG (slau445i) Fig 1-5]
  • 0 in reply to Bruce McKenney47378
    TI__Guru 60361 points
    Hi Cruijff,
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