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PDF BU21024FV-M Data sheet ( Hoja de datos )
| Número de pieza | BU21024FV-M | |
| Descripción | Touch Screen Controller ICs | |
| Fabricantes | ROHM Semiconductor | |
| Logotipo |  |
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Touch Screen Controller ICs
Resistive Type
Touch Screen Controller ICs
BU21023GUL, BU21023MUV, BU21024FV-M
No.11105EAT01
●Description
Unlike most resistive touch screen controllers, the BU21023/ BU21024 4-wire resistive touch screen controllers enable
dual-touch detection and gesture recognition. These intelligent controllers expose a set of registers to a host processor and
are software configurable. 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 panel development which reduces development cost
and results in faster time to market across a family of products.
●Features
1) Enables single touch, dual touch & gesture recognition using standard 4-wire resistive touch panels
2) Adjustable touch detection threshold allows fine tuning of pressure sensitivity for an application
3) Enables measurement of single point touch pressure
4) SPI and I2C like interface for interfacing to host processor
5) Programmable interrupt polarity
6) 10-bit ADC provides sufficient resolution for finger or stylus inputs
7) Firmware for internal CPU may be downloaded from Host processor or from an EEPROM
8) Includes filtering options to eliminate false coordinates
9) Built in support for intelligent calibration
10) Easy to swap X & Y coordinates or adapt to different touch panel connections
11) Single 3V power supply
12) Available in a range of small package sizes and temperature ranges
13) Ideally suited for large volume automotive, consumer and industrial applications
●Application
・Products with a LCD that can benefit from pan and zoom operations.
・Smart phones, Digital Cameras, Video Cameras, GPS Receivers, Printers,
Copiers, automotive navigation panels, touch kiosks
・Tablet PCs , Notebook computers, LCD displays (with USB interface)
●Line up matrix
Parameter
Screen
Maximum detection point
BU21023GUL
4-wire resistive
touch screen
2
BU21023MUV
4-wire resistive
touch screen
2
BU21024FV-M
4-wire resistive
touch screens
2
Integrated Filter process
Yes Yes Yes
Gesture Detection
Yes Yes Yes
Supplied Voltage Range(V)
2.7 － 3.6
2.7 － 3.6
2.7 － 3.6
Temperature Range(℃)
Host I/F
PKG
-20 － 85
4-wire SPI
2-wire serial
VCSP50L2
-20 － 85
4-wire SPI
2-wire serial
VQFN028V5050
-40 － 85
4-wire SPI
2-wire serial
SSOP-B28
www.rohm.com
© 2011 ROHM Co., Ltd. All rights reserved.
1/17
2011.08 - Rev.A
1 page  
BU21023GUL,BU21023MUV,BU21024FV-M
●EEPROM I/F
BU21023/BU21024 controllers include an EEPROM interface for firmware download.
Device address of EEPROM is set via register 0x51(EEPROM_ADDR).
Timing chart
tHD;STA
Technical Note
tSU;STO
SDA
SCL
tSU;DAT
tHD;DAT
Address
Read
/Write
ACK
Data
ACK
Data
ACK
Parameter
SCL clock frequency
START hold time
SCL ”L” width
SCL ”H” width
Data hold time
Data setup time
STOP setup time
Symbol
fSCL
tHD:STA
tLOW
tHIGH
tHD:DAT
tSU:DAT
tSU:STO
Min.
270
0.7
1.4
1.4
0.7
0.7
0.7
Limits
Typ.
310
-
-
-
-
-
-
Max.
350
0.9
1.8
1.8
0.9
0.9
0.9
Unit
kHz
µs
µs
µs
µs
µs
µs
Condition
Protocol
*IC does not support the write command.
*IC supports the following read command.
Start
S
SLAVE
ADDRESS
WA
1st WORD
ADDRESS
A
2nd WORD
ADDRESS
A
DATA(0)
A
DATA(n-3) A DATA(n-2) A DATA(n-1) A
DATA(n) N P
Stop
www.rohm.com
© 2011 ROHM Co., Ltd. All rights reserved.
5/17
2011.08 - Rev.A
5 Page 
BU21023GUL,BU21023MUV,BU21024FV-M
Technical Note
【BU21024FV-M】
No. Pin name I/O
Function
fig
1
EDA
I/O EEPROM SDA
C
2 ECL O EEPROM SCL
C
3
YNM
I/O Panel interface (Test input)
E
4
XNM
I/O Panel interface (Test input)
E
5
YPM
I/O Panel interface (Test input)
E
6
XPM
I/O Panel interface (Test input)
E
7 YN I/O Panel interface
E
8 XN I/O Panel interface
E
9 YP I/O Panel interface
E
10 XP I/O Panel interface
E
11 T4 I/O Test pin
E
12 PVDD
O Regulator output (for supply panel voltage)
-
13 AVDD
O Regulator output (for supply analog block)
14
DVDD
I/O
Regulator output (for supply digital block) or supply digital voltage
(DVDD_EXT="H")
15 DVDD_EXT
I Digital voltage enable (H=Hi-Z , L=DVDD enable)
-
-
E
16 VDD
- Supply voltage
-
17 VSS
- Ground
-
18 RSTB
I H/W reset
E
19 CLK_EXT
I Supply external clock for debug
A
20 T1
I Test pin
A
21 T2
I Test pin
A
22 T3
I Test pin
A
23 IFSEL
I Intereface select pin (L=SPI, H=2wire serial)
A
24 SO
O SPI Serila data output
2wire
-
F
25 INT
O Interrupt output
C
26 SEL_CSB I SPI Chip select
2wire Slave address select
C
27 SDA_SI I/O SPI Serial data input
2wire Serial data in-out
C
28 SCL_SCK I SPI Serial clock input
2wire Serial clock input
C
1. Please use 1.0uF capacitors between AVDD and DVDD to GND, and leave PVDD terminal open.
2. If DVDD_EXT=”H “, the DVDD pin can be connected to an external 1.8V power source.
3. Please pull up the ECL, EDA, and INT pins using 10k ohm resistors as shown in the application diagram at the end of this document.
ECL and EDA pins may be directly connected to GND if an external EEPROM is not being used. Please connect a 0.1uF capacitor between
T4 and GND. T1, T2 & T3 pins should be connected to GND.
4. When using the 2 wire serial interface, please pull up the SCL_SCK, SDA_SI pins via 10k ohms and leave SO unconnected.
5. Please note that the values of resistors and capacitors mentioned here are only recommended values.
6. RSTB should be held low until supply voltage VDD has ramped up and has reached a stable level.
7. The polarity of INT pin is programmable via register 0x30
8. Connect CLK_EXT to GND for normal use
9. Please leave the XPM, XNM, YPM, YNM terminals open if using a 4-wire touch screen. These pins should be connected to the reference leads of an
8-wire touch screen if one is being used.
www.rohm.com
© 2011 ROHM Co., Ltd. All rights reserved.
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2011.08 - Rev.A
11 Page | ||
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