[Arm-netbook] Sleep (stand by) power consumption of A10/A13 device?

[krasi gichev]

Thanks for comments, my calculations are based on specification (in
internet). As I said, they claim 18 days with 3200mAh, so this means 432
hours with 3200mAh, and this gives 7mA . My tablet is Ployer MOMO 9
variant, built around March 2012. I can try to measure the battery current
in various modes. But this can be misleading because it might not represent
the real capabilities of the A10.
I am pretty sure that idle will never be so high as cnxsoft claims, my
tablet manages several days on stand by. If it was 0.34A it will hardly
last 10 hours. I suppose that this 0.34A is for mele or other non-portable
device.

Tom, you are saying that in suspend to RAM A10 is completely off, and this
5mA are mainly RAM self refresh consumption? Is there something easy that
can be done to bring it a little bit down - different RAM chips (DDR3L),
different power management chip instead of AXP? In general, could we find
out how this 5mA are spread over subsystems and decide which one makes
sense to optimize?

2012/7/13 Tom Cubie <mr.hipboi at gmail.com>

> On Fri, Jul 13, 2012 at 1:55 PM, krasi gichev <krasimirr at gmail.com> wrote:
> > I am looking into applying A10/A13 into automotive (entertaiment)
> > application. Is anybody aware how low the current consumption can go in
> mode
> > where OS is sleeping? I mean not powered off, but booted, ready to wake
> up
> > in several seconds, but doing nothing else beside waiting for GPIO
> (button)
> > wake up command? Something like sleep mode of the android tablets.
> > My best estimation is based on specs of one tablet that says that it has
> > stand by time of 18 days (with 3200mAh battery). This resolves to around
> 7mA
> > stand by consumption (this should be A10 + AXP209 total).
> When your tablet is bought? Because the new firmware of A10/A13 tablet
> supports suspend to ram, which will power off the cpu and only leave
> the dram in self refresh mode when standby. Which is typical 5mA for
> 512MB ram of two chips.
> >
> > Any input on this?
> >
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>
> --
> Keep simple, stay foolish.
>
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