> Chris, I can see your point, but these devices must have a CPU running all > the time, otherwise how would the soft power-up work? Can the drain of a > CMOS clock chip such as that used in millions of PCs be all that much more?
CPU chips used in battery powered systems typically have a way to turn off the CPU until an interrupt arrives. If you are serious, you turn off the CPU clock too. That means you can only get woken up by the CMOS clock or an I/O device that has it's own clock. Yes, it takes time (few ms) to turn the clock back on. The numbers are impressive. If you use SRAM rather than DRAM, you don't need memory refresh. Many modern ARM chips include flash and SRAM. They aren't big enough for a phone full of bloatware, but the idle current is hard to measure. -- These are my opinions, not necessarily my employer's. I hate spam. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
