Programmable touch screen controller with stereo audio codec

TSC2302 is a highly integrated pda analog interface circuit. Supplied with 48-pin QFN. It contains a full 12-bit a /Dresistive Touch Screen converter (ADC) including driver, touch pressure measurement function, and 8-bit D/ a converter (DAC) output for LCD contrast control.

The TSC2302 offers 8 -, 10 -, and 12-bit programmable resolutions and sampling rates up to 125 khz to accommodate different screen sizes. Connected to the main controller serial interface via the standard SPI, the TSC2302 also provides two battery measurement inputs with a battery voltage of up to 6v while operating at a supply voltage of only 2.7V. It also has an on-chip temperature sensor that can read at 0.3c resolution.

Time diagram

The TSC2302 features a high-performance 20-bit, 48-ksps stereo audio codec with highly integrated analog capabilities. The audio portion of the TSC2302 includes microphone inputs with built-in preamplifiers and microphone bias circuits, auxiliary stereo analog inputs, single-line level outputs, and stereo headphone amplifier outputs. Digital audio data is transmitted through the standard l2s interface. A fully programmable PLL generates an audio clock from a wide variety of system clocks are also included.

Simplified view of the touch screen analog input section