UCS221L-AG6-R datasheet(5/5 Pages) UTC

5 / 5 page

UCS221

CMOS IC

UNISONICTECHNOLOGIESCO.,LTD

5 of 5

www.unisonic.com.tw

QW-R140-010.a



TYPICAL APPLICATION CIRCUIT

The capacitor and resistor might be connected with CS (pin4) for getting a stable sensitivity.

The capacitor value which is connected to CR pin (CR) should be almost the same as the total CS capacitance

(include parasitic capacitance) for an effective differential sensitivity calibration.

UCS221

is reset by internal reset circuit. VDD voltage rising time should be shorter than 100msec for proper

operation.

The sensitivity can be adjusted through a connection of SYNC pin.

From two UCS221 to ten UCS221 (or other TS series touch sensor) can work on the one application at the same

time thanks to SYNC function.

UCS221

OUT port has an open drain structure. The pull-up resistor should therefore be needed as above figure.

VDD periodic voltage ripples over 50mV or the ripple frequency which is lower than 10 kHz it can cause wrong

sensitivity calibration. To prevent above problem, power (VDD, GND) line of touch circuit should be separated from

the other circuit. Especially the LED driver power line or digital switching circuit power line should be certainly treated

to be separated from touch circuit.

The CS pattern should be routed as short as possible and the width of the line should be around 0.25mm.

The CS pattern routing should be formed by bottom metal (opposite metal of touch PAD).

The capacitor which is between VDD and GND is an obligation. It should be placed as close as possible from

UCS221

The empty space of PCB must be filled with GND pattern to strengthen GND pattern and to prevent external noise

that causes interference with the sensing frequency.

UTC assumes no responsibility for equipment failures that result from using products at values that

exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other

parameters) listed in products specifications of any and all UTC products described or contained herein.

UTC products are not designed for use in life support appliances, devices or systems where malfunction

of these products can be reasonably expected to result in personal injury. Reproduction in whole or in

part is prohibited without the prior written consent of the copyright owner. UTC reserves the right to

make changes to information published in this document, including without limitation specifications and

product descriptions, at any time and without notice. This document supersedes and replaces all

information supplied prior to the publication hereof.

UCS221L-AG6-R Scheda tecnica(PDF) 5 Page - Unisonic Technologies