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Supply DRV5023 with a I/O of MSP430 MCU

Xavier BERGER
Prodigy 50 points
Other Parts Discussed in Thread: DRV5023, MSP430G2131

Hello all,

There is a white paper (slyy058) for which a DRV5023 is supplied by the I/O P1.1 of the MSP430G2131.

What about the current driven from the I/O to charge the coupling capacitor of resquested for the DRV5023 ?

Best regards,

Xavier

  • 0
    TI__Guru** 114905 points
    Hi Xavier,

    The author has been contacted. He should respond soon.
  • 0
    TI__Prodigy 55 points

    Hello Xavier,

    In general the MSP430 GPIO is sufficiently stable and buffered in that it can directly power the DRV5000 hall sensor.  If a decoupling capacitor is added to the DRV5000 hall sensor, and directly powered and depowered from the MSP430 GPIO, the power consumption adder is 1/2C*V^2*F. Thus if using a 0.1uF decoupling capacitor, at 3V and toggling at 3Hz, the addition power consumption is ~ 1.5uW. Using a 0.01uF capacitor at the same voltage and toggle frequency the adder is ~ 0.15uW.