Lpc2000

> My last project used an LPC2138.  My next project is battery powered
> and must be able to sleep then wake up each hour.  From reading various
> posts it looks like the LPC takes about 60-70uA when operating in deep
> sleep with RTC enabled.

LPC213x data sheet excerpt:
IBAT // Power-down mode supply current // VBAT
RTC clock = 32 kHz (from RTXC pins), Ta = +25 °C
VDD = 3.0 V, VBAT = 2.5 V - 14 - mA
VDD = 3.0 V, VBAT = 3.0 V - 16 - mA
VDD = 3.3 V, VBAT = 3.3 V - 18 - mA
VDD = 3.6 V, VBAT = 3.6 V - 20 - mA

You should be able to take advantage of this with a scheme like this:
1. Use RTC to generate desired hourly alarm interrupt
2. Set RTCWAKE bit in INTWAKE to enable alarm wake up
3. Power down part via PD bit in PCON

Perhaps there is variation in this for the LPC214x and the LPC2101/2/3.


Joel