Datasheet

OVERVIEW
X+
Y+
X-
Y-
AuxiliaryInput
GND
TSC2007
GND
1 Fm 0.1 Fm
Touch
Screen
GPIO
SDA
SCL
Host
Processor
PENIRQ
SDA
SCL
VDD/REF
AUX
GND
A1 A0
1.2kW1.2kW
1.8VDC
TSC2007
SBAS405A – MARCH 2007 – REVISED MARCH 2009 ...................................................................................................................................................... www.ti.com
The TSC2007 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 TSC2007 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 TSC2007 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
• I
2
C Interface
Communication with the TSC2007 is done via an I
2
C serial interface. The TSC2007 is an I
2
C slave device;
therefore, data are shifted into or out of the TSC2007 under control of the host microprocessor, which also
provides the serial data clock.
Control of the TSC2007 and its functions is accomplished by writing to the command register of an internal state
machine. A simple command protocol compatible with I
2
C is used to address this register.
A typical application of the TSC2007 is shown in Figure 19 .
Figure 19. Typical Circuit Configuration
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Product Folder Link(s): TSC2007