Texas Instruments
Tablet featuring OMAP(tm), battery management (1S/2S), touch screen control, and wireless connectivity with WiFi, Bluetooth and FM capabilities
Block Diagram
Tablet Diagrams
Design Considerations

A Tablet is a handheld electronic device primarily designed to run multimedia and web-based applications which require considerable processing power. Its main advantage over a laptop PC or a Notebook PC is its portability which is achieved by having a small form factor and less number of peripheral devices. Additionally, it uses a touch screen as the primary interface to control and interact with the product. Key requirements for a Tablet include:

  • small form factor: portability
  • wireless connectivity options
  • power efficiency

Applications Processor: The OMAP3621 processor OMAP36x is designed and optimized for advanced multimedia capabilities supporting full multi-standard playback and record functionality up to 720p HD resolutions It manages all the critical functions including text or video displays and audio interfaces. Typical operating systems used are Linux and Android.

Wireless Connectivity: TI's WiLink 7.0 solution is a single-chip WLAN, Bluetooth, GPS, and FM solution that delivers low-power, small form-factor, and low-cost requirements of portable equipment manufacturers worldwide.

Display: TI provides solutions for the LCD/OLED displays which include the low-power, high-ESD protection touch screen controllers, display interface products, and LCD bias and backlight solutions. Light sensors are also essential for continuous monitoring of ambient lighting to keep the power consumption for backlighting to down to a minimum.

Audio: The TLV320AIC3100/10/11 are low-power audio codecs that integrate stereo headphone and class-D speaker amplifiers to extend battery life. They are capable of advanced audio processing for improved voice and music. They are pin-to-pin and SW compatible to allow enable quick and easy product spin. Software for OMAP is available. Additional power savings can be achieved by using the TPA6141A2, a class-G DirectPath (capfree) stereo headphone amplifier.

Power Management: TI provides the complete power management solution for the Tablet design including a Power Management Unit (PMU) integrated with a USB-OTG Transceiver and a keypad controller. The outstanding efficiency of the power conversion extends battery run time in addition to minimizing heat dissipation.

Battery Management - Accurate fuel gauging maximizes usable battery capacity and ensures orderly shutdown. The option to choose between system side and pack side battery fuel gauge offers customers flexibility in design. TI offers a large portfolio of linear and switching charger ICs both for single cell and double cell batteries. In case a high voltage charger is used, the charger front end protection IC is not needed. However, if the charger is integrated in a low voltage PMU or chipset, the front end IC is very important to protect the system from over-voltage and over-current.

Application Notes

Basic Calculation of a Boost Converter's Power Stage (Rev. B)

Coefficient RAM Access Mechanisms (Rev. A)

LDO PSRR Measurement Simplified

Improving battery safety, charging, and fuel gauging in portable media apps

Using the bq24075 Charger and bq27500/1 Fuel Gauge

TPS65950/30/20 32 KHz Oscillator Schematic and PCB Layout Guidelines

Single Cell Gas Gauge Application Book

Single Cell Gas Gauge Circuit Design

Optimizing Transient Response of Internally Compensated DC-DC Converters

Calibration in touch-screen systems



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