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PDF BU21021GUL Data sheet ( Hoja de datos )
| Número de pieza | BU21021GUL | |
| Descripción | 4-wire resistive Touch Screen Controller | |
| Fabricantes | ROHM Semiconductor | |
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BU21021GUL
Datasheet
4-wire resistive
Touch Screen Controller
BU21021GUL
●General Description
BU21021GUL is a resistive touch screen controller,
which is capable of detecting 2 points touch with a
legacy 4-wire resistive touch screen. BU21021GUL is
capable of detecting X/Y coordinates, touch pressure in
1 point detection mode, and a pair of X/Y coordinates in
2 point detection mode.
It is also capable of recognizing multiple finger gestures
from coordinate data variation and notifying to host with
gesture detection flags respectively.
BU21021GUL employs embedded CPU for noise
filtering, coordinate calculation, gesture detection and
other signal processing required on a chip.
●Feature
■ Legacy 4-wire resistive touch screen is applicable
■ 1 point / 2 points touch detection
■ On chip coordinate generation
■ Multiple gesture detections
■ 3V single power supply
■ Higher coordinate resolution with 12-bit SAR A/D
converter
■ On chip clock generator
■ Selectable HOST I/F(IFSEL pin)
4-wire SPI / 2-wire serial bus
●Key Specification
■ Power supply voltage
■ Temperature range
■ Standby current
■ Sleep current
■ Operating current
■ Coordinate resolution
2.7V to 3.6V
-25℃ to 85℃
5.0uA (Max.)
60uA (Typ.)
4.0mA (Typ.)
12bit
●Package
VCSP50L2
2.70 mm x 2.65 mm x 0.55(max) mm
●Application
■ Equipments with user Interface employing 4-wire
resistive touch screen.
■ Mobile phone, Tablet PC, PDA or other portable
information devices.
■ Digital still camera, Digital video camera, portable TV
or other Audio-visual devices.
■ Note PC, Touch screen monitor, printer or other PC
peripherals.
●Application Circuit Example
(2-wire serial I/F, Slave address=B8h, non-use EEPROM)
Figure 1. Application circuit example
○Product structure：Silicon monolithic integrated circuit
.www.rohm.com
© 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111・14・001
○This product is not designed protection against radioactive rays
1/10
TSZ02201-0Y1Y0F300060-1-2
19.Jun.2012 Rev.001
1 page  
BU21021GUL
●Block Diagram
Datasheet
Figure 4. Block Diagram
●Description of Blocks
Screen-I/F
: 4-wire touch screen interface
ADC
: 12-bit SAR A/D converter
OSC
: 20MHz oscillator for internal block
Regulator
: Internal power supply.
DVDD can be supplied from external
Clock generator : System clock and internal timing generation
CPU
: Noise filtering, dual touch detection and touch coordinates generation
Work memory : CPU work memory
Program memory : CPU program memory
EEPROM-I/F : External EEPROM-I/F for CPU program memory downloads
Host-I/F
: 4-wire SPI I/F / 2-wire serial bus I/F
Filter
: Median average filter (Maximum 16 data)
www.rohm.com
© 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
5/10
TSZ02201-0Y1Y0F300060-1-2
19.Jun.2012 Rev.001
5 Page 
Datasheet
Notice
●General Precaution
1) Before you use our Products, you are requested to carefully read this document and fully understand its contents.
ROHM shall not be in any way responsible or liable for failure, malfunction or accident arising from the use of any
ROHM’s Products against warning, caution or note contained in this document.
2) All information contained in this document is current as of the issuing date and subject to change without any prior
notice. Before purchasing or using ROHM’s Products, please confirm the latest information with a ROHM sales
representative.
●Precaution on using ROHM Products
1) Our Products are designed and manufactured for application in ordinary electronic equipments (such as AV equipment,
OA equipment, telecommunication equipment, home electronic appliances, amusement equipment, etc.). If you
intend to use our Products in devices requiring extremely high reliability (such as medical equipment, transport
equipment, traffic equipment, aircraft/spacecraft, nuclear power controllers, fuel controllers, car equipment including car
accessories, safety devices, etc.) and whose malfunction or failure may cause loss of human life, bodily injury or
serious damage to property (“Specific Applications”), please consult with the ROHM sales representative in advance.
Unless otherwise agreed in writing by ROHM in advance, ROHM shall not be in any way responsible or liable for any
damages, expenses or losses incurred by you or third parties arising from the use of any ROHM’s Products for Specific
Applications.
2) ROHM designs and manufactures its Products subject to strict quality control system. However, semiconductor
products can fail or malfunction at a certain rate. Please be sure to implement, at your own responsibilities, adequate
safety measures including but not limited to fail-safe design against the physical injury, damage to any property, which
a failure or malfunction of our Products may cause. The following are examples of safety measures:
[a] Installation of protection circuits or other protective devices to improve system safety
[b] Installation of redundant circuits to reduce the impact of single or multiple circuit failure
3) Our Products are designed and manufactured for use under standard conditions and not under any special or
extraordinary environments or conditions, as exemplified below. Accordingly, ROHM shall not be in any way
responsible or liable for any damages, expenses or losses arising from the use of any ROHM’s Products under any
special or extraordinary environments or conditions. If you intend to use our Products under any special or
extraordinary environments or conditions (as exemplified below), your independent verification and confirmation of
product performance, reliability, etc, prior to use, must be necessary:
[a] Use of our Products in any types of liquid, including water, oils, chemicals, and organic solvents
[b] Use of our Products outdoors or in places where the Products are exposed to direct sunlight or dust
[c] Use of our Products in places where the Products are exposed to sea wind or corrosive gases, including Cl2,
H2S, NH3, SO2, and NO2
[d] Use of our Products in places where the Products are exposed to static electricity or electromagnetic waves
[e] Use of our Products in proximity to heat-producing components, plastic cords, or other flammable items
[f] Sealing or coating our Products with resin or other coating materials
[g] Use of our Products without cleaning residue of flux (even if you use no-clean type fluxes, cleaning residue of
flux is recommended); or Washing our Products by using water or water-soluble cleaning agents for cleaning
residue after soldering
[h] Use of the Products in places subject to dew condensation
4) The Products are not subject to radiation-proof design.
5) Please verify and confirm characteristics of the final or mounted products in using the Products.
6) In particular, if a transient load (a large amount of load applied in a short period of time, such as pulse) is applied,
confirmation of performance characteristics after on-board mounting is strongly recommended. Avoid applying power
exceeding normal rated power; exceeding the power rating under steady-state loading condition may negatively affect
product performance and reliability.
7) De-rate Power Dissipation (Pd) depending on Ambient temperature (Ta). When used in sealed area, confirm the actual
ambient temperature.
8) Confirm that operation temperature is within the specified range described in the product specification.
9) ROHM shall not be in any way responsible or liable for failure induced under deviant condition from what is defined in
this document.
Notice - Rev.003
© 2012 ROHM Co., Ltd. All rights reserved.
11 Page | ||
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