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Handset: Entry

TI low-cost handset solutions tap into new markets with TI LoCosto single-chip devices.

Block Diagram


(Speaker Amplifier) Class D Amp Bluetooth Companion External Charger GPRS (LoCosto) Gas Gauge I2C for Vcore DVS LCD Backlight LED Driver Level Shift 1 Level Shift 2 System Power TWL3029 USB Protection

Design Considerations

Basic mobile phones need to deliver excellent voice quality at a very affordable cost. The trend is towards chip count reduction and TI has the best offerings in the Industry.

Texas Instruments’ solutions for handsets based on the LoCosto™ single-chip solutions range in capability from voice-only GSM phones with black and white displays to more advanced handsets with robust features such as MP3, Bluetooth® solutions, and megapixel cameras. By using TI's DRP™ single-chip technology, the RF transceiver, analog codec and digital baseband are combined into a highly-integrated solution. TI’s 18 years of wireless systems expertise spans handsets across multiple communications standards; as well as wireless LAN, GPS and Bluetooth™. TI provides its customers and partners with flexible and open solutions spanning single-chip platforms, custom-to-standard solutions, reference designs and core digital signal processor and analog technologies.

Power Management

While low-cost or voice-only phones may have all functionality integrated into the ABB/DBB, some applications may require additional buck or boost converters like TPS62260 or LDOs like TPS799xx/TPS717xx for additional power rails.

Phone safety remains a care-about for low-cost phones. Because of several incidents with unsafe batteries, battery authentication may be required; TI has solutions for both ID ROM and CRC authentication (bq20xx and bq261xx). Support for different lengths of encryption key depth is provided.

Audio Considerations

Low-end phones typically require a very basic set of features that enable voice calls. A low-cost and moderate-performance audio amplifier might be considered to provide sufficient power to the speaker to improve audio quality. TI’s audio amplifier portfolio (TPAxxxx) addresses this need.

For loudspeaker applications, a SPST switch may be needed to protect the integrated baseband audio amplifier from damage. For this the TS5A23xx family provides a cost-effective solution.

ESD and Logic Considerations

To resolve I/O compatibility problems with low-cost SPI mode displays, 8-bit level shifters such as TXB0108 may be best suited. ESD protection can be provided with the TPDxEyyy family of IEC61000-4-2 protection components which are available in different numbers of channels, breakdown voltages and capacitance values.

Application Notes

  • 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
  • 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
23 Sep 2008 TI expands power management portfolio for OMAP35x processor-based designs
11 Oct 2007 TI Introduces Dual-Voltage Level 200-mA LDO for Handheld Devices
08 Jun 2007 TI Introduces 1.2-A High-Brightness Flashlight LED Driver with I2C-Compatible Interface

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