NFC, Unlikely

The most recent rumor is that this mysterious square chip (occluded by an EMI can) is an NFC combo controller and antenna, based purely on its square dimensions.

The NFC "chip" ensquared in red

Given the primarily metal backside of the new iPhone, it's highly unlikely that NFC is in the cards for this generation. In fact, given the very little space at top and bottom dedicated to those glass RF windows, you can almost entirely rule it out.

NFC operates on the 13.56MHz ISM band, which has a relatively large wavelength, at 22.1 m. Making a traditional dipole antenna that radiates at all given the constraints of a smartphone package is thus a big challenge, considering that smartphones are maybe 5-inches tall at maximum, to say nothing of the supposed upcoming iPhone's longest linear dimension.


From the NFC Forum Analog Specification

As a result almost all NFC antennas are big inductors and work using a magnetic field coupled between a host and peer device. Since we're talking about an inductor, NFC antennas use as big of a coil of wire as possible with as many wires as possible tightly wound together, and thus often use as big of an unbroken 2D plane as they can get on the device. In the smartphone space, basically all NFC antennas to date are simply flat spirals on a PCB. Whether this gets hidden on top of the battery like what Samsung has done in recent devices, or printed on the back battery cover like earlier devices, the antenna is ultimately a big square or circle with as big and dense of a coil as possible.


Galaxy Nexus Battery and NFC Antenna Coils (Courtesy iFixit)

Getting a good inductor into the device is important because how much inductance your antenna has will determine maximum coupling distance and ease of alignment. It shouldn't need saying, but having a huge ground plane (the unibody metal back case) in the way of your NFC antenna will seriously degrade performance, thus only the top or bottom windows are logical places to put it.

It's this last point which makes us very skeptical about the top or bottom RF windows being used for a relatively small NFC loop – not because such a thing is impossible – but rather because of how terrible the resulting ease of alignment and maximum coupling distance would be. Most NFC implementations at present place the inductive coils as near to the center of the device as possible, partly because this is the most optimal way to maximize the area which can be dedicated to it, partly because it makes alignment natural. With an NFC antenna at the extreme top or bottom, alignment with non-iPhones (for example, payment tokens or reader tags) becomes a much more confusing task, and that doesn't seem like the Apple-like level of polish everyone is waiting for to drive NFC adoption.

There's also a healthy number of signaling pins in the flex cable leaving the mystery chip, some of which appear to be signaling for the front facing camera which is part of the assembly, others for earpiece, proximity, and ambient light sensor. In addition this assembly also is obviously the assembled display and touch stack. When you consider the inclusion of in-cell touch sensing which has been rumored for the upcoming iPhone, and the requirement for time multiplexing of both display driving and touch sensing signals (to mitigate interference and make this possible), it's more likely that the components under that heavily shielded (and grounded with a big spring finger) EMI can are the touch and display controller combo that need to work in conjunction for in-cell to be possible.

The inclusion of Passbook in iOS 6 is the most often-cited piece of evidence for Apple including NFC, which seems a bit paradoxical since Apple hasn't disclosed at all whether it would favor NFC or a Bluetooth LE (low-energy) or even QR code based payment token through that gateway.

Cellular Connectivity: LTE Expected WiFi, Battery & Conclusions
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  • doobydoo - Wednesday, August 29, 2012 - link

    The SG3 has a 1.5 GHz MSM8960 Dual Core Krait, not a quad core - in the USA. Reply
  • 8steve8 - Tuesday, August 28, 2012 - link

    Krait is much faster per core, quad core isn't the only or best way to improve performance. Reply
  • swb311 - Tuesday, August 28, 2012 - link

    I'd guess about 1.2 Ghz. which will be more than enough Reply
  • tipoo - Monday, September 10, 2012 - link

    My best hope would be that they put those chip designer purchases to good use and pulled a Krait, no need for apps to use four cores, just two faster cores. Reply
  • Aikouka - Tuesday, August 28, 2012 - link

    I see people talk about the litigation with Samsung affecting Apple's relations with Samsung, but I don't really suspect that is the case. The reason is that Samsung is a rather large company, and if you've worked for a large company before, you know how separate the different business areas truly can be. Do you think Samsung Foundries (the business area that handles chip manufacturing) really wants to hurt their numbers just because Samsung Mobility (the business area that handles mobile devices) is in a spat with one of their customers? I *highly* doubt it. Samsung Foundries more than likely passes up its financials just like Samsung Mobility to the overall corporation, and I highly doubt that they want to report such a large delta as losing Apple would be. Apple just wants what's best for Apple, which might be switching to TSMC as you mentioned.

    In other words, I don't see Samsung (Foundries) dumping Apple, but rather Apple dumping Samsung (Foundries).
    Reply
  • akibakun - Tuesday, August 28, 2012 - link

    Dear Editor,

    There are some politically charged watermarks Japanese in the phones posted on the NFC page. MacRumors has censored the watermarks.

    http://www.macrumors.com/2012/08/26/photos-of-asse...

    You may want to do the same.
    Reply
  • etamin - Tuesday, August 28, 2012 - link

    So Xiaomi is going to have a Krait device in the market before a Cortex A15 device comes to market? Reply
  • alxx - Tuesday, August 28, 2012 - link

    Would be nice to see a rouge gpu core but probably unlikely maybe in ipad mini

    Will be interesting to see if the updated itunes drops this year for one of the product launches or have to wait until early next year.

    No sure that a lot of people are going like Apple's maps app.
    It loads slower than google maps(iphone 4) and the level of detail is different for icons/places/shops(some worse some much better)

    Seems to do directions better than google maps
    Reply
  • swb311 - Tuesday, August 28, 2012 - link

    It's in beta. It will actually load faster thanks to vectored graphics. Reply
  • alxx - Tuesday, August 28, 2012 - link

    No kidding. How else do you think I'm using it.

    At the moment its not loading faster and is getting stalls worse than google maps
    Reply

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