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MSP-EXP430FR5994: target vcc selection for energytrace

Petre Rodan
Prodigy 140 points
Part Number: MSP-EXP430FR5994
Other Parts Discussed in Thread: ENERGYTRACE, , MSP-EXP430FR6989

hello!

I need to run energytrace profiles for a device that is going to run on a 3V Li cell.

in ccs 11.2.0.00007 I went to window -> preferences -> Code Composer Studio -> Advanced Tools -> EnergyTrace Technology

and set

Cell type CR2032

Target Connection Voltage 3000.0 mV

also

debug configurations -> Target -> MSP430 Flash Settings -> Target Voltage 3000mV

but these settings seem to have absolutely no influence on the voltage applied to the target uC, it seems to be stuck at ~3.30V.

I tested multiple devboards - msp-exp430fr5994 msp-exp430fr5529, msp-exp430fr6989 with the exact same results.

in the schematics I see you used an infinitely configurable mcu-controlled dc-dc converter, you have multiple places where the target VCC can be set - and these values get evaluated during run, but how do they get applied to the hardware? is there an external tool I need to use in order to set up a non-3v3 Vcc target voltage?

  • 0
    TI__Mastermind 28426 points

    Hi Petre,

    I thinl Enerytrace is use to monitor the power consumption, and if you add CR2032 here, this will put out a lifetime.

    And the the output of Enerytrace should be 3.3V.

    Thanks!

    Best Regards

    Johnson

  • +1 in reply to Johnson He
    Prodigy 140 points

    Ok, I made it output exactly 3.0V.

    for those interested, the secret is to replace the LDO in the FET area.

    for the fr5994 devboard, you either replace the IC101 IC or disable the trace between IC101 and C105 and provide an external 2.8-3.6V as replacement to the LDO (see the attached picture).

    the MCU-controlled dc-dc converter will match this new voltage and provide it on the +3v3 pin that goes toward the target.

    great circuit, thanks Mike Stein!

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