D
David Collier
If you are building, for example, an electricity meter, which measures
domestic power consumption, one needs to have a good deal of confidence
in the reading, both that it is accurate, and that it is never forgotten
or glitched.
So what is the accepted technology to hold the non-volatile kwhr count
etc. ? - a bit of CMOS RAM , a bit of flash in a micro? A non-vol ROM
like RAMTRON ferric memory, or something I haven't heard of?
And, as a s separate question, how are these things engineered to give
the necessary confidence that they will run forever? Is a single-chip
micro with brownout detect good enough, or does it have to be a
non-processor solution still?
David
domestic power consumption, one needs to have a good deal of confidence
in the reading, both that it is accurate, and that it is never forgotten
or glitched.
So what is the accepted technology to hold the non-volatile kwhr count
etc. ? - a bit of CMOS RAM , a bit of flash in a micro? A non-vol ROM
like RAMTRON ferric memory, or something I haven't heard of?
And, as a s separate question, how are these things engineered to give
the necessary confidence that they will run forever? Is a single-chip
micro with brownout detect good enough, or does it have to be a
non-processor solution still?
David