TSZ02201-0Y2Y0F300050-1-2

© 2012 ROHM Co., Ltd. All rights reserved.

7.AUG.2012 Rev.002

TSZ22111・14・001

www.rohm.com

○Product structure：Silicon monolithic integrated circuit ○This product is not designed protection against radioactive rays

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Datasheet

4-wire Resistive

Touch Screen Controller

BU21025GUL

●General Description

BU21025GUL is a low power 4-wire resistive touch

screen controller. BU21025GUL measures coordinates

and touch pressures with a 12bit A/D converter.

BU21025GUL has a digital filter for noise reduction.

●Features

■

4-wire resistive touch screen controller

■

Single 1.65V to 3.60V supply.

■

Low standby current ( 0.8uA max)

■

12bit SAR A/D converter

■

2-wire serial interface

■

Command base interface

■

Digital filter

■

Touch pressure measurement

■

Auto power down control

■

Built-in clock oscillation circuit

●Key Specifications

■

Power supply voltage

1.65V to 3.60V

■

Temperature range

-30℃ to 85℃

■

Standby current

0.8uA (Max.)

■

Operating current

120uA (Typ.)

■

Coordinate resolution

12Bits

●Package

W (Typ.) x D (Typ.) x H (Max.)

VCSP50L2

2.00 mm x 1.50 mm x 0.55mm

●Applications

■

Equipment with a built in user interface of 4-wire

resistive touch screen

■

Portable device such as smart phone, tablet, PDA.

■

Digital still camera, digital video camera, portable

TV.

■

PC / PC peripheral equipment such as laptop PC,

touch screen monitor, printer.

●Typical Application Circuit

XP

YP

XN

YN

BU21025

AD0

AD1

SDA

AUX

INT

SCL

Auxilary Input

SDA

SCL

GPIO

VDD

GND

GND

GND

1.0μF

2.2kΩ

0.1μF

2.2kΩ

Master

( 2-wire serial

interface )

0.1μF

0.1μF

0.1μF

0.1μF

10Ω

10Ω

10Ω

10Ω

GND

Touch

Screen

3

2

5

1

4

1.

4-wire resistive touch screen

2.

Pull-up resistor for 2-wire serial interface

3.

Bypass capacitors

4.

Diodes for EDS protection

5.

Low pass filter for noise reduction