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Thread: How to retain RAM data when power is off?
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face BY : Mike Hardwick email (remove spam text)



>My microcontroller circuit has a 62256 (32Kx8) RAM chip, which is used for
>storing some important data I want to retain even when the power is off.
>What is the normal way to retain data on RAM? Is using a battery the best
>solution? If so, how do I turn on the battery "only" when the power is off?

John,

I've used Analog Devices' ADM695 more than once for jobs like this. It
handles backup battery switchover as well as chip select gating and a few
other functions that are very useful in most small embedded systems. It has
performed flawlessly...

Mike Hardwick, for Decade Engineering -- <http://www.decadenet.com>
Manufacturer of the famous BOB-II Serial Video Text Display Module!

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