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Karel
iRex Community Manager
Joined: 20 Jul 2006
Posts: 466
Location: Eindhoven
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 Posted: Thu Oct 16, 2008 10:03 am Post subject: About the battery life |
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During my absence there have been a few topics in regard to the battery life. In order to maintain an overview, I have locked all these topics and redirected the discussion to this new thread, where I would like to start with giving a bit more insight in the power consumption and battery life of the iRex Digital Reader 1000.
In the current software version 1.0, we have only implemented very limited power management. While the iRex Digital Reader has a hardware architecture that is capable of utilizing a number of advanced power management functionalities including a suspend-to-RAM (standby mode) and suspend-to-Flash (hibernate mode). Once these are implemented the battery life will effectively be several days.
Although the following data is not 100% correct, it should give you a good view on what to expect of the battery life, so please do not pin me down on this data.
The iRex Digital Reader has a battery of 1300 mA (milliampere) and with software version 1.0 the reader consume about 150 mA per hour, resulting in about 8 hours of battery life. With suspend-to-RAM or standby mode, which we will introduce in a next software update, the reader will go into standby mode after x seconds. While in standby mode the power consumption will scale back to less than 50 mA. Good for about 24 hours of standby time.
In addition to the standby mode we will also be looking to introduce a sleep mode or suspend-to-Flash. This means that if the reader is not being used for x minutes it will go into sleep mode. While in sleep mode the power consumption is reduced to about 1 mA. To 'wake up' the reader from hibernate takes about 10 seconds.
In the coming days we will come back to you with more information about our software road map and what software updates you can expect to see in the future. |
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TheWusMan
Joined: 06 Oct 2008
Posts: 50
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| Posted: Thu Oct 16, 2008 10:53 am Post subject: |
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That's fantastic news - thanks Karel.
In "suspend" mode will the screen still show a static page based on the last refresh ?
Also - I extend my offer to you:
Free 6 pack of Heineken, Grolsch or Becks if you can track order #16480 ! (or get the IrexShop a phone/land line)  |
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Matthijs
iRex Employee
Joined: 18 Jul 2006
Posts: 948
Location: Eindhoven
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| Posted: Thu Oct 16, 2008 11:10 am Post subject: |
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| TheWusMan wrote: | | In "suspend" mode will the screen still show a static page based on the last refresh ? |
Yes, in suspend to RAM mode the last image will stay on the screen and any button/pen-click will awake the device. |
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pthwaite
Joined: 07 Oct 2008
Posts: 131
Location: Ellesmere Port, UK
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| Posted: Thu Oct 16, 2008 11:19 am Post subject: |
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Brilliant
Looking forward to rev 2 & if possible a fix on some of the Companion software.
Thanks
_________________
Howard |
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flyingtablet
Joined: 14 Oct 2008
Posts: 28
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| Posted: Thu Oct 16, 2008 1:57 pm Post subject: |
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"While in standby mode the power consumption will scale back to less than 50 mA. Good for about 24 hours of standby time. "
Only 24 hr standby time? Hmm... what else is using power besides memory?
Other devices have much longer standby time.
e.g. Nokia N810 > 10 days? |
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zerospinboson
Joined: 27 Mar 2008
Posts: 56
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| Posted: Thu Oct 16, 2008 2:02 pm Post subject: |
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| flyingtablet wrote: | "While in standby mode the power consumption will scale back to less than 50 mA. Good for about 24 hours of standby time. "
Only 24 hr standby time? Hmm... what else is using power besides memory?
Other devices have much longer standby time.
e.g. Nokia N810 > 10 days? |
Nokia N810s have 128mb ram? |
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Karel
iRex Community Manager
Joined: 20 Jul 2006
Posts: 466
Location: Eindhoven
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| Posted: Thu Oct 16, 2008 2:21 pm Post subject: |
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| flyingtablet wrote: | "While in standby mode the power consumption will scale back to less than 50 mA. Good for about 24 hours of standby time. "
Only 24 hr standby time? Hmm... what else is using power besides memory?
Other devices have much longer standby time.
e.g. Nokia N810 > 10 days? |
standby mode is intended to reduce the power consumption between short breaks of usage, for extended inactivity the reader will switch to sleep mode and use about 1 mA, good for a few weeks of sleep mode. You can wake up the device again by pressing the menu key. |
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flyingtablet
Joined: 14 Oct 2008
Posts: 28
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| Posted: Thu Oct 16, 2008 2:59 pm Post subject: |
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| Karel wrote: |
standby mode is intended to reduce the power consumption between short breaks of usage, for extended inactivity the reader will switch to sleep mode and use about 1 mA, good for a few weeks of sleep mode. You can wake up the device again by pressing the menu key. |
So, wakeup from sleep mode will take 10 seconds?
What else does the reader do in standby mode??
N810 got 128MB ram and it's instant-on from standby. |
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Matthijs
iRex Employee
Joined: 18 Jul 2006
Posts: 948
Location: Eindhoven
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| Posted: Thu Oct 16, 2008 3:21 pm Post subject: |
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The terms are confusing here, so we're comparing the wrong things.
There are two 'suspend' modes:
1. Suspend to RAM -> Instant resume, user will not really notice the device has suspended
2. Suspend to FLASH -> Compare with Windows Hibernation: the entire memory is dumped to Flash. Restoring state will take a bit of time, e.g. ~10sec although that's just a guesstimate right now.
This mode is often used intead of power-down. No or almost no power is used because everything is switched off. Only the standby micro controller will be on in this mode, allowing the device to wake from f.i. the capacitive sensor.
Instant resume of any device is always from a Suspend to RAM mode, nothing can instantly resume from Flash. |
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mvoosten
Joined: 17 Apr 2008
Posts: 12
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| Posted: Thu Oct 16, 2008 3:37 pm Post subject: |
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Just wonder how my Hanlin V3 does the trick..
If I leave it lying on my table for weeks and press the flip page button it reacts immediately.. As an occasional reader the battery lasts at least 2 months from that device... and that for a device only costing 1/3th of an iLiad.. and they keep improving their device experience continuesly.
Last edited by mvoosten on Thu Oct 16, 2008 3:39 pm; edited 1 time in total |
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flyingtablet
Joined: 14 Oct 2008
Posts: 28
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| Posted: Thu Oct 16, 2008 3:38 pm Post subject: |
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| Matthijs wrote: | The terms are confusing here, so we're comparing the wrong things.
There are two 'suspend' modes:
1. Suspend to RAM -> Instant resume, user will not really notice the device has suspended
2. Suspend to FLASH -> Compare with Windows Hibernation: the entire memory is dumped to Flash. Restoring state will take a bit of time, e.g. ~10sec although that's just a guesstimate right now.
This mode is often used intead of power-down. No or almost no power is used because everything is switched off. Only the standby micro controller will be on in this mode, allowing the device to wake from f.i. the capacitive sensor.
Instant resume of any device is always from a Suspend to RAM mode, nothing can instantly resume from Flash. |
Yes. But standby time is only 24 hours.
This is much less than smartphones/PDA/N810, etc.
For example, if I modify N810 and replace its 4 inch screen with a
10 inch e-ink display, after showing the page, the device goes to
standby mode. In this mode, N810 last several days.
Why isn't this possible for DR1000?
Please correct me if I missed anything. |
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ranpha
Joined: 14 Oct 2008
Posts: 25
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| Posted: Thu Oct 16, 2008 4:28 pm Post subject: |
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I got my n810 all day on with wifi downloading ..it holds three days .... why does the cpu need 50ma in standby ? not to flip the page because that only drains when flipping.
Even my n82 with 3g on and dowoading 1 hour a day hold on longer with only 850ma and even 3d gaming ... |
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daoshi
Joined: 16 Oct 2008
Posts: 2
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| Posted: Thu Oct 16, 2008 4:49 pm Post subject: Re: About the battery life |
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| Karel wrote: | | The iRex Digital Reader has a battery of 1300 mA (milliampere) and with software version 1.0 the reader consume about 150 mA per hour, resulting in about 8 hours of battery life. With suspend-to-RAM or standby mode, which we will introduce in a next software update, the reader will go into standby mode after x seconds. While in standby mode the power consumption will scale back to less than 50 mA. Good for about 24 hours of standby time. |
Thanks Karel.
I have something to ask you here.
I understand, theoretically, DR1000 should have 8 hours of battery life using software version 1.0. It should be pretty easy for you or anyone from iRex to do the test and see how many hours DR1000 can actually stay on without heavy use.
If the number you get is about 8 hours, then CJP (who only got about 3 hours) may have a broken machine (please see CJP's posts in this forum for details).
Otherwise, if your number is close to what CJP observes (ie ~3 hours), then I strongly recommend you to re-calculate your above projections of future power management improvements based on the actual battery life.
Finally, we all can compare the calculated battery life with what iRex claims. It would be an indication of fundamental flaws, if there is any significant gaps in between the numbers. And we (customers and potential customers) can take appropriate actions accordingly.
Thanks. I'm looking forward to your reply.
Last edited by daoshi on Thu Oct 16, 2008 5:01 pm; edited 1 time in total |
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flyingtablet
Joined: 14 Oct 2008
Posts: 28
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| Posted: Thu Oct 16, 2008 4:57 pm Post subject: |
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| ranpha wrote: | I got my n810 all day on with wifi downloading ..it holds three days .... why does the cpu need 50ma in standby ? not to flip the page because that only drains when flipping.
Even my n82 with 3g on and dowoading 1 hour a day hold on longer with only 850ma and even 3d gaming ... |
If I remember correctly, in standby mode, it is the RAM that takes
power; CPU, not much. |
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ranpha
Joined: 14 Oct 2008
Posts: 25
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| Posted: Thu Oct 16, 2008 5:06 pm Post subject: |
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| lol even then why the 50ma power hehehe |
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