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Product structure：Silicon monolithic integrated circuit ○This product has no designed protection against radioactive rays

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TSZ02201-0L5L0F300840-1-2

© 2013 ROHM Co., Ltd. All rights reserved.

7.June.2016 Rev.004

TSZ22111・14・001

www.rohm.com

Resistive Type Touch Screen Controller ICs

BU21023GUL BU21023MUV

General Description

Unlike most resistive touch screen controllers, the

BU21023 4-wire resistive touch screen controller

enables dual-touch detection and gesture recognition.

These intelligent controllers expose a set of registers to

a HOST processor and are configured through software.

The controllers can detect single point coordinates, dual

coordinates, pinch, spread, rotate left and rotate right

gestures, enabling pan and zoom operations in

applications that previously had to rely exclusively on

capacitive touch technology. Resistive touch does not

require custom screen development which reduces

development cost, and results in faster time to market

across a family of products.

Features



Enables single touch, dual touch & gesture

recognition using standard 4-wire resistive touch

screens



Adjustable touch detection threshold allows fine

tuning of pressure sensitivity for an application



Enables measurement of single point touch

pressure



SPI- and 2-wire serial interface for interfacing to

HOST processor



Programmable interrupt polarity



10-bit ADC provides sufficient resolution for finger

or stylus inputs



Firmware for internal CPU may be downloaded

from HOST processor or from an EEPROM



Includes filtering options to eliminate false

coordinates



Built in support for intelligent calibration



Easy to swap X & Y coordinates or adapt to

different touch screen connections



Single 3V power supply



Available in small packages and temperature

ranges



Ideally suited for consumer

Packages

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

VCSP50L2

2.60mm x 2.60mm x 0.55mm

VQFN028V5050

5.00mm x 5.00mm x 1.00mm

VCSP50L2

VQFN028V5050

Applications



Products with an LCD can benefit from pan and

zoom operations.



Smart phones, Digital Cameras, Video Cameras,

GPS Receivers, Printers,

Copiers, automotive navigation screens, touch

kiosks



Tablet PCs , Notebook PCs, LCD displays (with

USB interface)

Key Specifications and Lineup

Parameter

BU21023GUL

BU21023MUV

Screen

4-wire resistive

touch screen

4-wire resistive

touch screen

Maximum Detection Point

2

2

Integrated Filter Process

Yes

Yes

Gesture Detection

Yes

Yes

Supplied Voltage Range(V)

2.7 to 3.6

2.7 to 3.6

Temperature Range(°C)

-20 to +85

-20 to +85

Host I/F

4-wire SPI

2-wire serial

4-wire SPI

2-wire serial

Package

VCSP50L2

VQFN028V5050

Datasheet