X+

Y+

X

-

Y

-

AuxiliaryInput

GND

TSC2017

GND

1 F

m

0.1 F

m

Touch

Screen

GPIO

SDA

SCL

Host

Processor

PENIRQ

SDA

SCL

1.2k

W

1.2k

W

1.8VDC

TSC2017

SBAS472 – DECEMBER 2009

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OVERVIEW

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.

Figure 19. Typical Circuit Configuration

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Product Folder Link(s): TSC2017