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PDF BU21023GUL Data sheet ( Hoja de datos )
| Número de pieza | BU21023GUL | |
| Descripción | Resistive Type Touch Screen Controller ICs | |
| Fabricantes | ROHM Semiconductor | |
| Logotipo |  |
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Datasheet
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.
Packages
VCSP50L2
VQFN028V5050
W(Typ) x D(Typ) x H(Max)
2.60mm x 2.60mm x 0.55mm
5.00mm x 5.00mm x 1.00mm
VCSP50L2
VQFN028V5050
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
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
Screen
Maximum Detection Point
Integrated Filter Process
Gesture Detection
Supplied Voltage Range(V)
Temperature Range(°C)
Host I/F
Package
BU21023GUL
4-wire resistive
touch screen
2
Yes
Yes
2.7 to 3.6
-20 to +85
4-wire SPI
2-wire serial
VCSP50L2
BU21023MUV
4-wire resistive
touch screen
2
Yes
Yes
2.7 to 3.6
-20 to +85
4-wire SPI
2-wire serial
VQFN028V5050
○Product structure：Silicon monolithic integrated circuit
.www.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ22111・14・001
○This product has no designed protection against radioactive rays
1/17
TSZ02201-0L5L0F300840-1-2
7.June.2016 Rev.004
1 page  
BU21023GUL BU21023MUV BU21024FV-M
Block Diagram and Description of each Block
【BU21023GUL / BU21023MUV】
XP
XN
YP
YN
CLK_EXT
Panel
I/F
ADC
(10bit)
Work
memory
EEPROM
I/F
CPU
(8bit)
Program
memory
Osc
Clock
generator
Regulator
register
Host
I/F
ECL
EDA
SEL_CSB
SCL_SCK
SDA_SI
SO
INT
IFSEL
Screen I/F
ADC
OSC
Regulator
Clock Generator
CPU Core
Work Memory
Program Memory
EEPROM I/F
Host I/F
4-wire resistive touch screen interface
10-bit A/D converter
Internal 20MHz oscillator block with optional external clock input
Internal regulator provides 1.8V DVDD supply. DVDD can also be supplied from an
external source if DVDD_EXT pin is tied high.
System clock and timing generation (10MHz CPU clock)
For dual touch processing, programmability and HOST interface
Data memory for CPU
Program memory for CPU. Code can be downloaded by HOST processor or from an
external EEPROM
To connect to external EEPROM when downloading program memory from EEPROM.
Use of external EEPROM is optional.
4-wire SPI or 2-wire serial interface provides access to registers
www.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
5/17
TSZ02201-0L5L0F300840-1-2
7.June.2016 Rev.004
5 Page 
BU21023GUL BU21023MUV BU21024FV-M
Application Examples
【BU21023GUL BU21023MUV】
BU21023GUL/MUV support 2 HOST interfaces (4-wire SPI and 2-wire serial bus).
The figures shown below are application circuits when each interface is used.
(Although BU21023GUL is CSP package, it is shown in similar figure for comparison.)
*Please connect the terminal of ECL/EDA to GND when downloading the firmware from the HOST.
ECL and EDA pins pull up to VDD if an external EEPROM is used. (example : 10kΩ)
*Please insert TVS diode or Zener diode to each sensor line to enhance resistance to ESD.
*Please pull up the INT terminal to VDD or HOST IO voltage (max 4.5V).
*In the case of 4-wire SPI use, please pull down the SO terminal to GND.
If not in use, connect it to the GND.
option(*3)
Host
VDD
10kohm
panel
option(*2)
option(*1)
10ohm
YN
1nF
10ohm
XN
1nF
10ohm
YP
1nF
10ohm
XP
1nF
BU21023
option(*5)
SO (10kohm)
IFSEL
T3
T2
T1
CLK_EXT
RSTB
VDD
(*1) For Noise protection RC-LPF.
(Please select constant and design for requirement and environment)
(*2) For ESD protection. (Zener diode/TVS diode)
(*3) EEPROM interface PIN. Please pull-up to VDD in use.
(*5) Please pull-down as prevention against the SO terminal output Hi-Z.
0.1uF
1uF 1uF
1uF
Example 1: BU21023GUL/MUV Application Circuit (4-wireSPI)
In the case of 2-wire serial interface use,
please pull up the INT, SCL_SCK, SDA_SI terminal to VDD or HOST IO voltage(max4.5V).
panel
option(*2)
option(*4)
option(*3)
Host
10kohm
10kohm
10kohm
VDD
option(*1)
10ohm
YN
1nF
10ohm
XN
1nF
10ohm
YP
1nF
10ohm
XP
BU21023
SO
IFSEL
T3
T2
T1
CLK_EXT
RSTB
1nF VDD
(*1) For Noise protection RC-LPF.
(Please select constant and design for requirement and environment)
(*2) For ESD protection. (Zener diode/TVS diode)
(*3) EEPROM interface PIN. Please pull-up to VDD in use.
(*4) Please connect to VDD when use as slave address = "BAh".
0.1uF
1uF 1uF
1uF
Example 2: BU21023GUL/MUV Application Circuit (2-wire Serial bus)
www.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
11/17
TSZ02201-0L5L0F300840-1-2
7.June.2016 Rev.004
11 Page | ||
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| PDF Descargar | [ Datasheet BU21023GUL.PDF ] | |
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