Re: The Map Is Not The Territory

From	Bernd Paysan <bernd.paysan@gmx.de>
Newsgroups	comp.lang.forth
Subject	Re: The Map Is Not The Territory
Date	2012-07-02 00:23 +0200
Organization	1&1 Internet AG
Message-ID	<jsqilq$avv$1@online.de> (permalink)
References	(1 earlier) <053ad03e-0477-446a-9cf5-4469fb85feb8@t8g2000yqd.googlegroups.com> <bfa4dbe7-7838-42e6-aa1a-a63f0062a55e@googlegroups.com> <128e2791-07d6-4f16-93a4-2627e9209c06@h9g2000yqi.googlegroups.com> <jsq5jd$n8$1@online.de> <8a84e8d7-9815-4903-8ba4-96535ffaa099@a34g2000yqi.googlegroups.com>

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rickman wrote:
> Are you sure the DRAM is the cause of the short battery life of the
> smart phones?  I was just looking at a data sheet for SDRAM and it
> lists a 1 mA current for the refresh function and 300 uA standby
> current.

What size?  Must be a lot less than the half gigabyte current 
smartphones have.  Look for LPDDR3.

> I think most of the power goes to the 1 Watt CPU that uses
> the DRAM, not so much the DRAM itself.

In operation, yes.  But the self-refresh current is about 20mW/GB in the 
mobile low power SDRAMs - and phones have half a gigabyte now.  My 
mobile phone has a 1700mAh battery, which means at 3.8V and ideal 
conditions, the DRAM self-refresh drains the battery in two weeks.  So 
no way to achieve the one month standby time of my LG GS100 with a much 
smaller battery.  If I look at the standby times calculated with GO 
Power Master, it delivers exaclty the numbers I calculate from the DRAM 
spec.  Standby is DRAM consumption.

Of course, once you turn your smartphone on, the display, the CPU and 
GPU, the WLAN chip, the 3G connection and all that drain your battery 
much faster.  But for standby with only GSM on (accept calls and SMS), 
the DRAM is the sucker.  The typical smartphone is in connected standby, 
which is a lot worse - WLAN on, 3G on, frequently checking for mails, 
for instant messages (WhatsApp or whatever), Facebook updates, and so 
on.  There should be something similar to the GSM messaging system, 
which is very well designed to save power.

-- 
Bernd Paysan
"If you want it done right, you have to do it yourself"
http://bernd-paysan.de/

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The Map Is Not The Territory Jason Damisch <jasondamisch@yahoo.com> - 2012-06-27 17:44 -0700
  Re: The Map Is Not The Territory dambere@web.de - 2012-06-28 02:32 -0700
    Re: The Map Is Not The Territory Mark Wills <markrobertwills@yahoo.co.uk> - 2012-06-28 02:47 -0700
      Re: The Map Is Not The Territory John Passaniti <john.passaniti@gmail.com> - 2012-06-28 13:19 -0700
        Re: The Map Is Not The Territory dambere@web.de - 2012-06-29 14:29 -0700
  Re: The Map Is Not The Territory quiet_lad <gavcomedy@gmail.com> - 2012-06-29 14:44 -0700
    Re: The Map Is Not The Territory "Elizabeth D. Rather" <erather@forth.com> - 2012-06-29 12:17 -1000
    Re: The Map Is Not The Territory rickman <gnuarm@gmail.com> - 2012-06-29 16:15 -0700
  Re: The Map Is Not The Territory quiet_lad <gavcomedy@gmail.com> - 2012-06-29 14:43 -0700
    Re: The Map Is Not The Territory Jason Damisch <jasondamisch@yahoo.com> - 2012-06-30 10:46 -0700
      Re: The Map Is Not The Territory rickman <gnuarm@gmail.com> - 2012-06-30 19:54 -0700
        Re: The Map Is Not The Territory Howerd <howerdo@yahoo.co.uk> - 2012-07-01 09:14 -0700
          Re: The Map Is Not The Territory rickman <gnuarm@gmail.com> - 2012-07-01 14:12 -0700
        Re: The Map Is Not The Territory Bernd Paysan <bernd.paysan@gmx.de> - 2012-07-01 20:40 +0200
          Re: The Map Is Not The Territory Howerd <howerdo@yahoo.co.uk> - 2012-07-01 12:15 -0700
            Re: The Map Is Not The Territory Bernd Paysan <bernd.paysan@gmx.de> - 2012-07-01 23:52 +0200
          Re: The Map Is Not The Territory rickman <gnuarm@gmail.com> - 2012-07-01 14:41 -0700
            Re: The Map Is Not The Territory Bernd Paysan <bernd.paysan@gmx.de> - 2012-07-02 00:23 +0200
              Re: The Map Is Not The Territory Paul Rubin <no.email@nospam.invalid> - 2012-07-05 00:06 -0700
                Re: The Map Is Not The Territory rickman <gnuarm@gmail.com> - 2012-07-05 10:49 -0700
              Re: The Map Is Not The Territory rickman <gnuarm@gmail.com> - 2012-07-05 10:38 -0700
                Re: The Map Is Not The Territory Bernd Paysan <bernd.paysan@gmx.de> - 2012-07-06 02:22 +0200
                Re: The Map Is Not The Territory rickman <gnuarm@gmail.com> - 2012-07-05 18:57 -0700
                Re: The Map Is Not The Territory Mark Wills <markrobertwills@yahoo.co.uk> - 2012-07-06 02:13 -0700
                Re: The Map Is Not The Territory Bernd Paysan <bernd.paysan@gmx.de> - 2012-07-07 01:11 +0200
                Re: The Map Is Not The Territory Albert van der Horst <albert@spenarnc.xs4all.nl> - 2012-07-06 10:58 +0000
                Re: The Map Is Not The Territory rickman <gnuarm@gmail.com> - 2012-07-06 06:00 -0700
                Re: The Map Is Not The Territory Paul Rubin <no.email@nospam.invalid> - 2012-07-06 20:41 -0700
                Re: The Map Is Not The Territory rickman <gnuarm@gmail.com> - 2012-07-07 06:56 -0700
                Re: The Map Is Not The Territory Paul Rubin <no.email@nospam.invalid> - 2012-07-07 21:45 -0700
                Re: The Map Is Not The Territory rickman <gnuarm@gmail.com> - 2012-07-08 15:53 -0700
                Re: The Map Is Not The Territory Paul Rubin <no.email@nospam.invalid> - 2012-07-08 21:08 -0700
                Re: The Map Is Not The Territory rickman <gnuarm@gmail.com> - 2012-07-09 16:32 -0700
              Re: The Map Is Not The Territory Brad Eckert <hwfwguy@gmail.com> - 2012-07-05 13:22 -0700
            Re: The Map Is Not The Territory Mark Wills <markrobertwills@yahoo.co.uk> - 2012-07-02 01:26 -0700
              Re: The Map Is Not The Territory stephenXXX@mpeforth.com (Stephen Pelc) - 2012-07-02 10:15 +0000
            Re: The Map Is Not The Territory "Paul E. Bennett" <Paul_E.Bennett@topmail.co.uk> - 2012-07-02 19:28 +0100
  Re: The Map Is Not The Territory Albert van der Horst <albert@spenarnc.xs4all.nl> - 2012-07-01 11:35 +0000
    Re: The Map Is Not The Territory Howerd <howerdo@yahoo.co.uk> - 2012-07-01 09:31 -0700
      Re: The Map Is Not The Territory Paul Rubin <no.email@nospam.invalid> - 2012-07-01 14:03 -0700
        Re: The Map Is Not The Territory rickman <gnuarm@gmail.com> - 2012-07-01 14:57 -0700
    Re: The Map Is Not The Territory rickman <gnuarm@gmail.com> - 2012-07-01 14:50 -0700

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