iPad Teardown Analysis Provides Tidbits About Battery, RAM In Apple A4 And More

Apple's iPad Is Here

Folks at iFixit had disassembled the iPad yesterday as soon as they got their hands on it and had given us their initial impressions.

Kyle Wiens, CEO of iFixit, sent us an email to give us some more tidbits on the internals of the iPad such as RAM in Apple A4, which we thought you might find interesting as there are rumors that Apple A4 could make its way to the next generation iPhone.

iFixit’s iPad teardown reveals that the iPad's battery has 5.5 times the capacity of the battery in iPhone 3GS. This is thanks to “two batteries wired in parallel, for a total of 24.8 Watt-hours”.

According to the report, the device "sips just 2.5 Watts. That's 1/5 the power of a compact fluorescent bulb".

The report points out that “the USB power supply had to be enhanced specifically for the iPad. It's a 10W unit manufactured by Foxlink Technology, Ltd”, which is the reason for iPad ‘Not charging’ issues reported by users.

iPad Teardown

iFixit has made the following observations about Apple A4:

The A4 is a Package-on-Package (PoP), with at least three layers of circuitry layered on top of each other. A4 is packaged just like the iPhone processors, microprocessor in one package and two memory modules in the other package. They're all sandwiched together in a very nice and thin PoP.

The iPad RAM is INSIDE the A4 processor package. Confirming this took quite a bit of sleuthing: we had to partner with Chipworks to X-ray the processor. The X-ray revealed two layers of RAM. In addition to the ARM processor, the A4 package contains two stacked Samsung dies.

iPad Teardown

iPad seems to only have 256MB RAM, which is the same as iPhone 3GS and not 512MB as was reported by some media houses earlier.

They have also pointed out that the rumored slot for a front facing camera is actually taken up by the ambient light sensor.

iPad Teardown

Kyle has told us that iFixit will be working with Chipworks to release a more detailed analysis of Apple A4. As always, we’ll keep you posted so stay tuned.