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The TPS60250 is a high-efficiency, constant-frequency charge pump dc/dc converter that can drive up to five white LEDs for a main display and up to two white LEDs for a subdisplay with regulated constant current for uniform intensity. A microcontroller (MCU) can be used to control the currents for white LEDs via the TPS60250 charge pump through a standard I2C interface, with the MCU acting as the I2C master. This application report describes a simple hardware and software platform to demonstrate a Texas Instruments MSP430 MCU implementing an I2C master interface using two general-purpose I/O pins via I2C software emulation. The MSP430 is an ultra low power microcontroller that is ideal for controlling white LEDs in applications such as PDA, PMP, GPS, and cell phone screens.

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