FEATURES

23· 4-Wire Touch Screen Interface

· Ratiometric Conversion

· Single 1.2V to 3.6V Supply

· Preprocessing to Reduce Bus Activity

· High-Speed I2C-Compatible Interface

· Internal Detection of Screen Touch

· Register-Based Programmable:

– 10-Bit or 12-Bit Resolution

– Sampling Rates

– System Timing

· On-Chip Temperature Measurement

· Touch Pressure Measurement

· Auto Power-Down Control

· Low Power:

– 760mW at 1.8V, 50SSPS

– 580mW at 1.6V, 50SSPS

– 285mW at 1.2V, 50SSPS

– 74mW at 1.6V, 8.2kSPS Eq. Rate

– 47mW at 1.2V, 8.2kSPS Eq. Rate

· Enhanced ESD Protection:

– ±8kV HBM

– ±1kV CDM

– ±25kV Air Gap Discharge

– ±12kV Contact Discharge

· 2.5 x 2.5 WCSP-18 and 4 x 4 QFN-20 Packages

U.S. Patent No. 6,246,394; other patents pending.

APPLICATIONS

· Cellular Phones

· Portable Instruments

· MP3 Players, Pagers

· Multiscreen Touch Control

DESCRIPTION

The TSC2004 is a very low-power touch screen controller designed to work with power-sensitive,

handheld applications that are based on advanced

low-voltage processors. It works with a supply voltage

as low as 1.2V, which can be supplied by a single-cell battery. It contains a complete,

ultralow-power, 12-bit, analog-to-digital (A/D) resistive

touch screen converter, including drivers and the

control logic to measure touch pressure.

In addition to these standard features, the TSC2004

offers preprocessing of the touch screen measurements to reduce bus loading, thus reducing

the consumption of host processor resources that can

then be redirected to more critical functions.

The TSC2004 supports an I2C serial bus and data

transmission protocol in all three defined modes:

standard, fast, and high-speed. It offers programmable resolution of 10 or 12 bits to

accommodate different screen sizes and performance

needs.

The TSC2004 is available in a miniature, 18-lead,

5 x 5 array, (2.554 ±0.54)mm x (2.554 ±0.54)mm

wafer chip-scale package (WCSP), and a 20-pin, 4 x 4 QFN package. Both packages are characterized for

the –40°C to +85°C industrial temperature range.