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TI touchscreen controllers have built-in processing units

Posted: 24 Apr 2002 ?? ?Print Version ?Bookmark and Share

Keywords:tsc2000? tsc2200? burr brown? touchscreen controller? pda touchscreen controller?

Designed to address the needs of handheld computing applications, the TCS2000 and TSC2200 programmable analog interface circuits from Texas Instruments Inc. feature built-in processing units that allow them to perform touchscreen processing tasks without microprocessor interaction.

The co-processing solution reduces microprocessor interrupt service routine (ISR) overhead and saves a significant number of MIPS for the microprocessor, thereby allowing the system to run faster.

The circuits are part of the company's Burr-Brown product line and perform touch detection, position control, pressure and plate resistance measurements, and data average filtering in four-wire touchscreen applications.

"Acting as a true hardware peripheral, these devices detect touch activity, take several readings to allow for settling time and averaging, and interrupt the host controller only when valid data is available," said Scott Ngo, senior strategic marketing engineer for TI's data acquisition products.

The TSC2000 and TSC2200 offer programmable resolution and sampling rates from 8 bits to 12 bits and up to 125kHz to accommodate different screen sizes and applications. The devices interface to the host microprocessor through a standard SPI serial interface.

Shipped in a TSSOP-28 package, the TSC2200 contains a 12-bit, 4-wire resistive ADC including drivers, control circuit to measure touch pressure, a 4x4 keypad interface, and an 8-bit DAC output for LCD backlight or contrast control. It also features direct battery measurement and two auxiliary inputs for USB or ac adapter detection.

The TSC2000 is available in a TSSOP-20 casing and is similar to the TSC2200, but without the keypad interface.

Both also feature full power down control, on-chip temperature sensor, and operate form a single 2.7V to 5V supply.

The TSC2000 and TSC2200 are priced at $2.25 and $2.30, respectively in 1,000-unit quantities.





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