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Power consumption

Sergey Vladimirov
Expert 1300 points

Hi,

Id like to measure current drawn by CC430 when in sleep mode and when transmitting to estimate the battery life.

How I can measure it not damaging the chip?

Thanks,

Sergey

  • 0
    Guru 46710 points

    Try multimeter with microampere precision. Remember that many (cheap) multimeters have quite high internal shunt resistance while measuring weak currents, so you can have some voltage drop here. Better to have 2nd multimeter to measure actual voltage of cc430 while you are measuring current. Multimeters are quite slow, so it's good idea to put (low leakage) 50uF capacitor between VCC and GND of cc430.

    You need to make two software versions: 1) sleeping 2) continuously transmitting.

    When you know currents of 1) and 2), then you can measure timing of 2) with timers of cc430 itself.

  • 0 in reply to Ilmars
    Guru 227245 points

    Ilmars said:
    Try multimeter with microampere precision.

    i suggest using a scope on a small (10-100Ohm) series resistor. Well, it should be a good scope with 1mV/division as on 100 Ohm, it takes 10µA for 1 mV.

    Note that a scope is usually grounded, so the MSP must not (this also means no USB connection to a PC)

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