Lpc2000

> I am about to embark on my first LPC2106 project. I chose this product
> for its small size and cost for a single chip solution for a data logger.
> I also need counters + RTC; I also need a low power consumption. I want
> 10 years operation from a single lithium cell.

See: rtc_smps_lpc2k.pdf in Files section of this group.
This is just simple schematic that I designed [took me 5 minutes :)] to show
you one possible approach to this application.

When SMPS is in shutdown, total power consumption is not more than 2uA with
RTC working.

You can wake-up LPC with Enter button or with RTC interrupt. As soon as that
happens you need to drive PWRCTRL in order to have SMPS working just as long
as you need it. Then, check both Enter and PCF to see what caused wake-up.
When you want to shutdown again, release PWRCTRL.

When in shutdown LPC (and other circuits) are disconnected from battery so
voltage is 0V (true output disconnect).

If you decide to go to powerdown mode with LPC it's OK since SMPS has only
85uA quiescent current so, again, you have minimum power consumption.

This is as "low power" as it gets with LPC and battery with voltage lower
than 3V :) Even if it is not suitable for your application, you might find
this schematic useful - I hope :)

Regards,
Igor

P.S.
You could use P-I-C for your application, too ;)