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FET circuitry

Discussion in 'Electronic Basics' started by Dave_colq, Feb 2, 2009.

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  1. Dave_colq

    Dave_colq Guest

    Hi,

    I have a project where I need to cycle the power on a 2.5” HDD, The
    power cycle is controlled by a micro. The drive need to be on during
    startup and switched off when the port pin on the micro is high. The
    micro does some initialization during startup for 5 secs (erasing
    SRAM, loading data) so it can’t just switch the drive ON straight
    away. I was thinking of using a micro to a BJT to a FET but am not
    sure of the circuitry needed, again it needs to be on straight away
    and then switches off when the micro pin goes high, any idea guys?

    Any help would be greatly appreciated.

    Dave
     
  2. DJ Delorie

    DJ Delorie Guest

    Since most MCU ports are hi-Z on powerup, a pull-down resistor might
    be needed too.
     
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