Chapter 2. Understanding the iPhone

Although different models of the iPhone vary, the following core components are commonly found in Apple’s first-generation iPhones:




Samsung/ARM S5L8900B01 512 Mbit SRAM


Infineon PMB8876 S-Gold 2 EDGE Baseband Processor


Infineon M1817A11 GSM RF Transceiver


Samsung 65-nm 8/16 GB (K9MCG08U5M), 4 GB (K9HBG08U1M) MLC NAND Flash


Skyworks SKY77340-13 Signal Amplifier


Marvell 90-nm 88W8686

I/O Controller

Broadcom BCM5973A

Flash Memory

Intel PF38F1030W0YTQ2 (32 MB NOR + 16 MB SRAM)

Audio Processor

Wolfson WM8758


CSR BlueCore 4


Philips LPC2221/02992

The iPhone runs a mobile build of Mac OS X 10.5 (Leopard), which has many similarities to its desktop counterpart. The primary differences include:

ARM architecture

The iPhone uses the ARM (advanced RISC machine) processor architecture, originally developed by ARM Ltd. In contrast, a majority of desktop machines use the Intel x86 architecture.


Special hardware has been added to the iPhone to make it an effective and powerful mobile device. This includes various sensors, such as an accelerometer and proximity sensor, multi-touch capable screen to support gestures, and of course various radios including GSM, Wi-Fi, and Bluetooth.

User interface frameworks

Apple has built a custom set of user interfaces around the iPhone to accommodate the proprietary hardware sensors and the use of multi-touch. While the desktop version of Leopard contains frameworks for ...

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