TSC2007-Q1
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SBAS545 –SEPTEMBER 2011
OVERVIEW
The TSC2007-Q1 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-Q1 features
include:
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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-Q1 consists of the following blocks (refer to the block diagram on the front page):
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Touch Screen Sensor Interface
Auxiliary Input (AUX)
Temperature Sensor
Acquisition Activity Preprocessing
Internal Conversion Clock
I2C Interface
Communication with the TSC2007-Q1 is done via an I2C serial interface. The TSC2007-Q1 is an I2C slave
device; therefore, data are shifted into or out of the TSC2007-Q1 under control of the host microprocessor, which
also provides the serial data clock.
Control of the TSC2007-Q1 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 TSC2007-Q1 is shown in Figure 19.
1.8VDC
1mF
0.1mF
1.2kW
1.2kW
Host
GND
Processor
PENIRQ
GPIO
X+
Y+
X-
Y-
TSC2007
SDA
SCL
SDA
SCL
Touch
Screen
Auxiliary Input
GND
Figure 19. Typical Circuit Configuration
Copyright © 2011, Texas Instruments Incorporated
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