TSC2008 Datasheet, PDF (1/8 Pages) Texas Instruments – 1.2V to 3.6V, 12-Bit, Nanopower, 4-Wire Micro TOUCH SCREEN CONTROLLER with SPI™

TSC2007 ®
TSC2008
www.ti.com ...................................................................................................................................................................................................... SBAS406 – JUNE 2008
1.2V to 3.6V, 12-Bit, Nanopower, 4-Wire
Micro TOUCH SCREEN CONTROLLER with SPI™
FEATURES
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•23 4-Wire Touch Screen Interface
• Single 1.2V to 3.6V Supply/Reference
• Ratiometric Conversion
• Effective Throughput Rate:
– Up to 20kHz (8 Bit) or 10kHz (12 Bit)
• Preprocessing to Reduce Bus Activity
• SPI Interface
• Simple, Command-Based User Interface:
– TSC2046 Compatible
– 8- or 12-Bit Resolution
• On-Chip Temperature Measurement
• Touch Pressure Measurement
• Digital Buffered PENIRQ
• On-Chip, Programmable PENIRQ Pullup
• Auto Power-Down Control
• Low Power:
– 32.4µA at 1.2V, Fast Mode, 8.2kHz Eq Rate
– 43.8µA at 1.8V, Fast Mode, 8.2kHz Eq Rate
– 58.4µA at 2.7V, Fast Mode, 8.2kHz Eq Rate
• Software Reset
• Enhanced ESD Protection:
– ±8kV HBM
– ±1kV CDM
– Target ±25kV Air Gap Discharge
– Target ±15kV Contact Discharge
• 1.5 x 2 WCSP-12 and 4 x 4 QFN-16 Packages
U.S. Patent No. 6246394; other patents pending.
APPLICATIONS
• Cellular Phones
• PDA, GPS, and Media Players
• Portable Instruments
• Point-of-Sale Terminals
• Multiscreen Touch Control
DESCRIPTION
The TSC2008 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, ultra-low
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 TSC2008
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 TSC2008 supports an SPI serial bus and data
transmission protocol in all three defined modes:
standard, fast, and high-speed. It offers
programmable resolution of 8 or 12 bits to
accommodate different screen sizes and performance
needs.
The TSC2008 is available in a 12-lead,
(1,555 ±0,055mm) x (2,055 ±0,055mm) 3 x 4 array,
wafer chip-scale package (WCSP), and a 16-pin,
4 x 4 QFN package. The TSC2008 is characterized
for the –40°C to +85°C industrial temperature range.
X+
X-
Y+
Y-
AUX
Touch
Screen
Drivers
Interface
TEMP
VDD/REF
Mux
SAR
ADC
Internal
Clock
SPI
Serial
Interface
and
Control
PENIRQ
CS
SCLK
SDI
SDO
GND
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Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
SPI is a trademark of Motorola Inc.
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All other trademarks are the property of their respective owners.
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PRODUCT PREVIEW information concerns products in the
formative or design phase of development. Characteristic data and
other specifications are design goals. Texas Instruments reserves
the right to change or discontinue these products without notice.
Copyright © 2008, Texas Instruments Incorporated