> I have a project where I want to monitor temperature and the
> board has to be as small as possible. I want to have a micro
> with a UART, temperature sensing to 0.1 degrees, non-volatile
> memory of 0.5 megabytes, a real time clock and flash program
> memory of 2k bytes. I would like to obtain this in one chip if
> possible. I only need a few I/O. I suspect no such device exists.
> If need be I could get the temperature sensing done externally.

Temperature sensing can be done internally with any micro

http://home.clear.net.nz/pages/joecolquitt/0wdttemp.html

2k flash isn't a lot for most micros these days, but 512kB of
NV probably will mean an external IC. There are some serial
NVRAMs around which will help with the i/o. RTC is easy. An
SMT 16F628 (has h/wUART) + SMT NVRAM would do nicely

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