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battery powerd system

Wilfried Oertel

Hi,
I want to project controller board powered by 2 AAA batteries. It should have power down-wake up functionality (for long battery life) and serial communication. Are there any low power supply versions with 8032 core or better use a high efficiency step up regulator (than I could use my 5V programming environment).

  • 0

    Try the AT89C1051U. It will work down to 2.7V input. It also has a Idle and Power down mode. Its small (20 pin SOIC) and in Idle mode will pull 1mA and pull 20 uA!! in power down mode.(both at @3V and 12 MHz)

    For your serial port, try the MAX3229 series. It is a 2RX/2TX topology and it too will work down at 2.5V (and less I think) and has shut down and will pull only 0.3mA in AutoShutdown Mode. If you cannot use the UCSP package, try the MAX3323. It is quite a bit bigger and pulls about a 1mA @3V.

    In general, I recommend against any power supplies at all. They just burn power that could be used to directly power low voltage devices. I am sure Maxim or Linear have a simple 2.7V to 5V boost regulator that you could use if you wanted to.

    MG

  • 0

    Take a look at Philips low power chips as well:

    P89LPC92x
    P89LPC93x

    Priced right around $1 US in large quantity

    Phil

  • 0 in reply to Philip Garman

    Also check out the MAX3223. It's designed for battery power systems and has a self-shutoff and wakeup feature that powers the chip down to around 1uA when not in use. If your system spends most of the time in idle mode, this is your best bet.

    If serial activity is pretty much non-stop, the auto power off\on feature isn't really necessary.

  • 0 in reply to Manoj Gopalan

    "I am sure Maxim or Linear have a simple 2.7V to 5V boost regulator that you could use if you wanted to."

    I'm certain they do.

    However, if you want to go this route, you'd probably be better to look at one of their converters that runs from a single cell. This will simplify your mechanical design, and give better overall battery utilisation.
    You could probably use a single AA rather than two AAAs - which gives you a better energy density anyway.