On Thu, Nov 15, 2001 at 04:05:02PM +0100, Benny Sj�strand wrote: > - How much power do each device on the iPAQ consume (in mA or mW) ? > - Main processor SA1110 (this is included in the spec ...) > - SDRAM or DRAM > - Flash memory > - Sound, audio interface UDA1341 > - LCD display, lights, etc. > - IR port > - USB port > - RS232 > - PCMCIA > - Microcontroller, (buttons, battery charger etc. ) > - Any other device that's i dont know or have forget.
All figures for these will be subject to a specific set of conditions. For example, it's well known that a floating IO pin causes a higher power drain than if it is permanently held high or low by some means. To get maximal lifetime out of the battery, you really have to be extremely careful about the setting of each and every single IO line. I've come across very little evidence that the above has been really thought about - the sleep state of all IO pins should be setup at initialisation time, and not left floating. Currently, I'd bet that most IO lines are left floating, which isn't really that good, both from an ESD point of view as well as a power saving view. Also, I'm aware that the Assabet doesn't enter sleep state properly - it leaves some of the BCR bits set (leaving things like LEDs on, etc) which consume extra power. We get the majority of the BCR right on this platform however. _______________________________________________ http://lists.arm.linux.org.uk/mailman/listinfo/linux-arm Please visit the above address for information on this list.
