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Changes to Step #22

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Edit approved by Jeff Suovanen

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[* black] More ICs on the back of the logic board:
[* red] Qualcomm WFR1620 receive-only companion chip. Qualcomm [https://www.qualcomm.com/media/documents/files/the-qualcomm-difference.pdf|states|new_window=true] that the WFR1620 is "required for implementation of carrier aggregation with WTR1625L."
[* orange] Qualcomm PM8019 Power Management IC
[* yellow] Texas Instruments 343S0694 Touch Transmitter
[* green] AMS AS3923 Boosted[http://www.ams.com/eng/Products/NFC-HF-RFID/NFC-HF-Booster/AS3923|AS3923] NFC Tag Front End
[* icon_note] We believe that this is simply a small revision
Booster IC designed to “improve performance of the AMS [http://www.ams.com/eng/RF-products/RFID/AS3922|AS3922|new_window=true], which allowsexisting NFC controllers for "payment functionality in ultra-small form factorschallenging environments such as SIMmobile and wearables” and µSD"also delivers “less restrictive antenna design requirements”.
[* green] AMS AS3923 Boosted[http://www.ams.com/eng/Products/NFC-HF-RFID/NFC-HF-Booster/AS3923|AS3923] NFC Tag Front End
[* icon_note] We believe that this is simply a small revision
Booster IC designed to “improve performance of the AMS [http://www.ams.com/eng/RF-products/RFID/AS3922|AS3922|new_window=true], which allowsexisting NFC controllers for "payment functionality in ultra-small form factorschallenging environments such as SIMmobile and wearables” and µSD"also delivers “less restrictive antenna design requirements”.
[* blue] Cirrus Logic [https://chipworks.secure.force.com/catalog/ProductDetails?sku=APP-338S1201&viewState=DetailView&cartID=&g=|338S1201|new_window=true] Audio Codec
[* icon_reminder] A big and hearty mega-thanks to our pals at [http://www.chipworks.com/en/technical-competitive-analysis/resources/blog/inside-the-iphone-6-and-iphone-6-plus/|Chipworks|new_window=true] for helping us ID all of this tech. We definitely couldn't have done it without them!