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Handset: Smartphone

TI Handset solutions enable 3G with our OMAP processors and OMAP-Vox platform, bring mobile TV to mobile phones with our Hollywood solution.

Block Diagram


(Speaker Amplifier) Class D Amp (1) (Speaker Amplifier) Class D Amp (2) 3G Adjustable DC/DC for PA Analog Switch Application Processor Applications & Digital Base Band Processor Audio Codec - TLV320AIC3254 Application Bluelink 5.0 Solution DTV Supply DTV1000 External Charger GPS5300 Gas Gauge Headphhone Amplifier I2C for Vcore DVS LCD Backlight LED Driver LED Flash Level Shift 1 Level Shift 2 OLED Backlight Serdes Display Driver System Power TCS Modem Chipset TWL4030 Temp Sensor Touch Screen Controller USB Protection Video Amp WILink TNETW1253

Design Considerations

Given that today's Smartphone integrates features like personal organizers and email management tools with basic multimedia and handset capabilities, the typical "ON" time is more crucial to the end users than that of an entry level mobile phone. The feature set drives the need for high processing power, larger (brighter) displays, touch screen controls and speaker phone capability. To meet performance and form factor requirements of the phone, careful consideration to the supply current and package sizes is important. Hence, migrating to Class-D audio amplifiers, touch screen controllers with integrated audio, ESD protection, power management and overall power supply efficiency are critical.

To meet the growing demand for advanced multimedia features in the growing mid-range wireless market, TI offers OMAP-Vox™ solutions. TI provides silicon and software products supporting Real-Time and High Level Operating Systems, and a wide range of Open Source communities. TI's 18 years of wireless systems expertise spans handsets across multiple communications standards; as well as wireless LAN, GPS and Bluetooth™. TI solutions enhance the user experience with innovative 3D-graphics, high-quality video applications and advanced user interfaces.

TI's Video, audio and power management offering includes a series of system solutions for the development of these complex phones.

Power Management: TI offers power management solutions targeting the wide range of applications/graphic processors, feature-set and lighting voltage requirements often found in these phones. Special step-down DC/DC converters like the TPS624xx/ TPS65xxx families enable advanced dynamic voltage scaling to meet the needs of the newest mobile processors. TI TPS630xx family offers best-in-class 96% efficiency over a wide battery voltage range with input voltage down to 1.8 volts to extend battery life and provide support for emerging Li-ion battery technology. LDOs TPS799xx/ TPS717xx are available for additional power rails.

Requirements for wall-plug and USB-port charging can be addressed with the bq240xx family. Innovative next-generation gas gauge solutions are offered in the bq275xx using "Impedance Track" to automatically learn/detect battery character and provide status data to the host via a simple interface, eliminating the need for learning cycles and look-up tables. TI has solutions for both ID ROM and CRC authentication (bq20xx and bq161xx). Support for different lengths of encryption key depth is provided.

Audio Considerations: Smartphones seek to enhance the user's audio experience with signal-to-noise ratios (SNRs) exceeding 100 dB and improved features such as multi-band equalizers, 3-D surround effects and echo/noise cancellation. Low power consumption is always a key consideration in all such designs.

Full feature audio codecs in the TLV320AICxxxx/TLV320DACxxxx/PCMxxxx families integrate mono- and stereo-AD/DA converters and headphone/speaker amplifiers. Class-D amplifiers continue to increase in popularity because of their high efficiency and small-footprint packages. In some devices, an integrated DSP supports dynamic range compression, multi-band equalization, noise/echo cancellation and custom filtering. Newer generation TI audio codecs, such as the TLV320AIC3254, process sound with better audio quality and longer battery life.

Display/Lighting and Touch Screen Considerations: Latest-generation drivers such as TPS6115x/6x offer flexibility in the number of LEDs to be driven (3 to 10) and enable pulse-width modulation and digital dimming with up to 32 steps for brightness control in a small, 2x2 mm2 package. TI provides OLED-specific drivers like the TPS6108x/6114x. For illuminating keypads and fashion lighting, new LDO-based forward-voltage LED drivers are available (TPS751xx) as are 2- and 4-multilamp EL drivers for different color segmentation. Camera flash capability is addressed by the TPS61050 family with small footprint in CSP or QFN packages.

TI offers integrated touch-screen controller solutions like the TSC21xx/TSC23xx families with integrated ESD protection that is an added value. Touch-screen operation can easily result in discharges up to 12KV; a stand-alone TSC provides the best isolation from the rest of the phone electronics. The TSC2k family of touch screen controllers achieves low power consumption and is immune to vibration and display noise; small-footprint packages are available.

Display I/O voltage is typically > 2.7V which can create a mismatch with other digital logic; 20 and 24-bit level shifters such as SN74AVC20Txxx can be used to resolve I/O compatibility problems.

Application Notes

  • Flash Programming Solutions for the TMS320F28xxx DSCs (spraal3.htm, 8 KB)
    19 Aug 2008 Abstract
  • Transition From Prior bqJunior Gauges to the bq27x10 (slua429.htm, 8 KB)
    17 Jul 2007 Abstract
  • Dynamic Power-Path Mgmt & Dynamic Power Mgmt (slua400.htm, 8 KB)
    02 Jan 2007 Abstract
  • Minimizing Ringing at the Switch Node of a Boost Converter (slva255.htm, 8 KB)
    15 Sep 2006 Abstract
  • Performing Accurate PFM Mode Efficiency Measurements (slva236.htm, 8 KB)
    18 Apr 2006 Abstract
  • Measuring Class-D Amplifiers for Audio Speaker Overstress Testing (sloa116.htm, 8 KB)
    28 Oct 2005 Abstract
  • Selecting the Right Level Translation Solution (Rev. A) (scea035a.htm, 8 KB)
    22 Jun 2004 Abstract
  • Shelf-Life Evaluation of Lead-Free Component Finishes (szza046.htm, 8 KB)
    24 May 2004 Abstract
  • Understanding the Terms and Definitions of LDO Voltage Regulators (slva079.htm, 8 KB)
    21 Oct 1999 Abstract
    

Selection and Solution Guides

Selection Guides

  • Logic Selection Guide 2007 (Rev. Z) (sdyu001z.pdf, 2.79 MB)
    24 Apr 2007 Download
  • Interface Selection Guide (Rev. C) (sszt009c.pdf, 1.24 MB)
    13 Sep 2006 Download

Solution Guides

  • Wireless Handsets Solutions Guide (Rev. I) (swpy010i.pdf, 1.57 MB)
    28 Mar 2008 Download

Product Bulletin & White Papers

White Papers

  • Multicore Embedded POV: Cutting to the core of the problem (spay036.pdf, 72 KB)
    18 Aug 2008 Download
  • Dynamic Adjustment of System Parameters Improves Echo and Noise Cancellation (spry094.pdf, 144 KB)
    05 Dec 2006 Download

News Releases & Authored Articles

News Releases

Date Headline
27 Oct 2008 TI introduces the lowest power 1.8-V audio codec with integrated miniDSP in production today
12 Feb 2008 TI introduces tiny USB power management switches with adjustable current limit

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