How many times have you used your mobile as an MP3 player, or played games on it, only to see your battery bar wilt into a thin red line by the end of the day?
In an attempt to shed some light on the main causes of rubbish battery life and possible alternatives, UKMR chatted to Patrick Le Bihan of Spansion, the world’s largest Flash memory solutions provider.
What uses most of the power on a mobile?
Memory – it’s like the brain of the phone and the CPU is the heart taking information given by the brain to translate it by launching applications, a camera and MP3s. In the memory you store not only the application but also the information, for example an MP3. One of the biggest fears for mobile network operators is that if you have a consumer listening to his MP3 all day, or playing his new games or watching TV, at the end of the day he can’t receive or make phone calls. So extended battery life and how memory affects it is something critical for operators.
What do you mean by memory?
In a mobile’s memory subsystem you have the Flash memory that is non-volatile (information is kept when power is switched off), then there’s the RAM, and that is volatile and used for exchange with the CPU (central processing unit). Now, if you want to download an MP3 from an operator’s music site, you need to download to the DRAM first, and then you copy back from the DRAM to the Flash. The DRAM is what consumes the most energy in a mobile phone - each time you download something, it goes to the RAM and then copies back to the Flash. We provide very fast write times for mobiles, so when you want to download something you don’t have to wait for hours - you can actually bypass the RAM and download directly into the flash, which consumes much less power than the RAM and extends the battery life.
Another case is when you want to read, or play and MP3 file. First you launch the MP3 player then you select the MP3. The longer it takes to launch the MP3 player, the longer the memory is being used and the more energy you consume.
So again with Spansion’s MirrorBit, not only do we have a fast write time but also a fast read time, enabling you to launch the media player faster, extending the battery life. And because the read time is so fast you don’t need the read the MP3 file from the RAM, you can do that directly from the flash, giving up to 6 hours extra battery life, and allowing the mobile to have a smaller amount of D-RAM. So by using this component you can use less D-RAM, which allows you to consume much less energy.
How long until this component is a handset standard?
Everything depends on the type of phone you have - they don’t require the same amount of memory or computing power.
With MirrorBit we are combining the fast read and fast write that is available with different phone architecture and we foresee that this product will be present in around 60% of the mobile market by 2010. At he moment, Spansion has 40% market share. We hope to supply 60% by 2010 and the product itself will be available in samples early 2008, and deployed for the consumer by the end of 2008.
How far ahead is mobile technology from the phones that consumers can purchase?
From conception it’ll take 18 to 24 months to turn into a real product. So with all the providers of the ecosystem – like the CPU providers and other guys – we are looking at a minimum of 2 or 3 years ahead. And whenever the product is available, you still have to provide it to the handset guys, who need to integrate it into the handset.
What about future plans?
We’re already working on actions of the paradigm of the architecture of the phone, so not only on the memory. It’s like a puzzle - if you design a part of the puzzle you have to make sure that the other parts fit. We’re currently working on 3D video games for mobiles, there’s also mobiles that can be deployed with streaming video, so you can go from one channel to the other without having to wait.
We’re also working on the security field, because we’re not only providing flash memory, but flash memory solutions. So we’re working on providing security storage, so you can have credit card details on your phone, which will really allow you to deploy NFC (Near Field Communications) so you can purchase stuff with your phone and pay by NFC. (Beren Neale)
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