TSC2017_14 Datasheet, PDF (12/39 Pages) Texas Instruments – 12-Bit, Nanopower, 4-Wire Micro TOUCH SCREEN CONTROLLER with I2C™ Interface

TSC2017
SBAS472 – DECEMBER 2009
OVERVIEW
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The TSC2017 is an analog interface circuit for a human interface touch screen device. All peripheral functions
are controlled through the command byte and onboard state machines. The TSC2017 features include:
• Very low-power touch screen controller
• Very small onboard footprint
• Relieves host from tedious routine tasks by preprocessing, thus saving resources for more critical tasks
• Ability to work on very low supply voltage
• Minimal connection interface allows easiest isolation and reduces the number of dedicated I/O pins required
• Miniature, yet complete; requires no external supporting component
• Enhanced electrostatic discharge (ESD) protection
The TSC2017 consists of the following blocks (refer to the block diagram on the front page):
• Touch Screen Sensor Interface
• Auxiliary Input (AUX)
• Temperature Sensor
• Acquisition Activity Preprocessing
• Internal Conversion Clock
• I²C Interface
Communication with the TSC2017 is done via an I²C serial interface. The TSC2017 is an I²C slave device;
therefore, data are shifted into or out of the TSC2017 under control of the host microprocessor, which also
provides the serial data clock.
Control of the TSC2017 and its functions is accomplished by writing to the command register of an internal state
machine. A simple command protocol compatible with I²C is used to address this register.
A typical application of the TSC2017 is shown in Figure 19.
1.8VDC
Touch
Screen
1mF
0.1mF
GND
X+
Y+
X-
Y-
PENIRQ
TSC2017 _SDA
SCL
1.2kW
1.2kW
Host
Processor
GPIO
SDA
SCL
Auxiliary Input
GND
Figure 19. Typical Circuit Configuration
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