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EHF-120-01-L-D-SM-02_Datasheet PDF

Also, you can obtain a highlights update delivered directly to your inbox by signing up for my weekly newsletter – just Click Here to request this newsletter using the Manage Newsletters tab (if you aren't already a member you'll be asked to register, but it's free and painless so don't let that stop you [grin]).

Steve’s technical background is in RF and microwave measurements, and semiconductor test. He brings a great deal of experience to the real-world applications of Symmetricom’s oscillators and atomic clocks.

About the contributor: Elisabeth Bobrow is the Applications Engineer for the Quantum Chip Scale Atomic Clock (CSAC) product line at Symmetricom. Elisabeth works with customers to help them maximize the benefits they can achieve using CSACs in a wide variety of applications. Prior to working at Symmetricom, Elisabeth was an electrical engineer at BAE Systems US for 6 years. She received her BSEE degree from the University of Massachusetts at Amherst.

EHF-120-01-L-D-SM-02_Datasheet PDF

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Before we go into deep details on the Flashing and custom ROMs, let's look at the Android architecture (stack) along with common terminology.

Introduction to Android Platform An important factor that sets Android apart from most other mobile operating systems is that it's based on an open source platform, allowing anyone to modify most of Android's source code. Ideally, this would mean that if a developer felt Android needed a specific feature or capability, he or she could build it and incorporate it into the OS.

EHF-120-01-L-D-SM-02_Datasheet PDF

The layer above kernel includes Android libraries, what gives the kernel instruction to perform specific tasks for example, the media framework library supports playback and recording of various audio, video and picture formats. Located on the same level as the libraries layer, the Android runtime layer includes a set of core Java libraries that allow Android applications to build their apps using Java programming language along with Dalvik virtual machine.

EHF-120-01-L-D-SM-02_Datasheet PDF

For laymen, Virtual Machine is a software application that can execute programs just like physical machines behaving like an independent device with its own operating system. The Android OS uses virtual machines to run each application as its own process. This makes applications independent of each other so if an application crashes it would still leave other applications running.

The layer above the libraries is the application Framework. This includes the programs that manage the phone's basic functions like resource allocation, location management, notification management etc. Being an open development platform application developers have full access to Android's application framework, allowing them to build extremely rich applications.

Sachin Gupta is a Senior Applications Engineer with Cypress Semiconductor. He loves working on different types of analog and digital circuits, as well as synthesizable codes. He can be reached at sgup@cypress.com.

Umanath Kamath works as an Applications Engineer with Cypress Semiconductors. He enjoys building analog and digital circuits and systems using different types of sensors.

Part 1: Selection criteria and charger implementation

As more devices become mobile, efficient battery usage has become essential. Engineers tend to give utmost importance to the current consumption of the device. They devise numerous ways to reduce the power consumption because the longer the battery lasts, the greater perceived market value for the product. One important aspect to consider here is the battery itself.

Selecting an appropriate battery for a particular application is important because the battery determines the number of hours for which the device can work without the need for recharging, the amount of weight it adds to the system, and how much it adds to the BOM (bill of materials) cost. Along with the selection of battery, proper design of charging circuitry is also crucial because improper design can reduce the battery life or can even lead to battery failure (i.e., dangerous leakage or explosion). Failure leading to produce recall can cause massive losses and damage a manufacturer’s reputation.

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