Document No. DER-S0026A 2 Version 1.2 ©2008 DMC Co., Ltd.
TSC-40/IC Product Specification
1. PRODUCTS OUTLINE 1-1. Scope of Application
This specification applies to the TSC-40/IC.
1-2. Outline
TSC-40/IC is an analog touch screen control IC that performs A/D conversion on analog signal for the
4-wire and 5-wire resistive analog touch screen, and transmits coordination data with 10bit resolution to
the host in a 9600bps serial (asynchronous).
The serial communication enables a connection with PC’s serial port via RS-232C I/F circuit or TTL level.
At the coordinate detection, internal filtering process provides a stabilized coordinate value. By using the
correction function, in addition to the losses that occur in the circuit, display deflection between touch
screen input point that occur in each element and indicator cursor can be corrected to adjust the display
position.
1-3. Features
§ Two coordinate output modes are provided and selected per application: “Coordinate data mode”
where coordinate information is sent with 10bit resolution as it is, and “correction data mode” where
read coordinate is converted to the indicator’s display coordinate and sent.
§ “Correction data mode“ is available after EEPROM is externally attached. It enables to set up to nine
correction points. Coordinate data can be corrected with the base of correction points. Using this
function allows the host driver to make the implementation of correction function unnecessary. In
addition, by placing correction points at the touch screen center and center points of four edges of
touch screen, resistance value deviation of transparent electrode film can be corrected.
§ Two external switch functions are always available in the coordinate (correction) data mode. Two
pieces of external switch information are, at the transmission of coordinate data, included in the
coordinate data as pen-down/pen-up information. Since in the pen-up mode, pen-up data can be
always output to the host, this switch is available as a function switch.
§ At the touch screen input, buzzer and LED outputs are available. Input confirmation via display and
sound is available.
§ When no touch screen input is performed, the state moves to “power-save mode“ so that such
application can be supported that requests a low power consumption.
§ Seven types of coordinate output rates are provided and either can be selected per application among
seven types: six types from 30 to 150p/s plus one type, a point mode that outputs the coordinate only
one time when pen-down is performed.