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Featured Products
Ideal for a wide range of applications, from portables to automotive
4-Wire Resistive Touchscreen Controllers
BU210xx Series
Marketproven
500k to 1Mpcs
shipped/month
Enables multi-touch operation in
existing 4-wire resistive touch panel
systems
No
ghosting
Broad
lineup
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Compatible with conventional 4-wire resistive touchscreens
Enabling multi-touch detection
Resistive Touch vs. Capacitive Touch Systems
Problems with conventional systems
Resistive Touch
■ Conventional resistive multi-touch systems utilize multiple wires
or a matrix configuration, necessitating significant panel modifications
■ Obstacles related to implementation methods, costs, and
noise resistance make the switch to capacitive touch systems difficult
HOST
Processor
ROHM Resistive Touchscreen Controller Application Circuit Diagram
YP
4-Wire
Resistive
Touch Panel
XP
HOST
Touch
Controller
I2C or SPI
YN
XN
No panel changes
necessary
No extra parts
required
Touchscreen
IC
High noise
immunity
I C Wire, etc.
2
HOST
Processor
Mounted on mainboard
No. of Ch
Cost
Cover Glass
Noise
Immunity
EMI
Resistive Touch
4
Low
Not required
High
Small
Capacitive Touch
30+
High
Required
Low
Large
ROHM
Resistive
LCD
4 Lines
Includes external
parts mounted
on FPC
Touch
IC
Capacitive
Panel
LCD
■ Dedicated analog signal processing and operating sequence
analysis enables 2-point coordinate separation during 1-point detection
sampling using existing 4-wire signal lines
Cover Glass
FPC
Resistive
Panel
ROHM Technology
Capacitive Touch
ADC
(10bit)
Panel
( )
Work
memory
I/F
EEPROM
I/F
CPU
(8bit)
Filter
ECL
EDA
REG
XP
Program
memory
XN
Panel
YP
I/F
YN
Clock
generator
register
SDA_SIO
SCL_SCK
SEL_CSB
IFSEL
INT
Host
I/F
4-Wire Type
Automotive-Grade 2-Point Touch
BU21024FV-M A/D Converter
(10bit)
VREF
Digital
Filter
AUX
T4
T3
T2
T1
VSS
RSTB
PVDD
AVDD
DVDD
DVDD_EXT
Regulator
SAR ADC
PGND
Osc
CLK_EXT
REG
Pen
Detection
SPI/I 2C Interface
CPU Built-In (with Gesture and Noise Filter functions)
Supply Voltage: 2.7 to 3.6V
Package: SSOP-B28 (10×7.6, t=1.15mm)
4-Wire Type
2-Point Touch
A/D Converter
(12bit)
WL-CSP
(Wafer Level CSP)
BU21029GUL
OSC
INT
Control
Logic
SDA
2 wire
serial
I/F
AD0
SCL
AD1
RSTB
GND
XP
XN
YP
YN
XPM
XNM
YPM
YNM
BU21029GUL
VDD
BU21024FV-M
BU21023MUV/GUL
PVDD
VDD
Block Diagrams
I 2C Interface
No CPU (saving space and energy)
Supply Voltage: 1.65 to 3.6V
Package: VCSP50L2 (2×2, t=0.55mm)
Lineup
Touchscreen Controllers
Capacitive Type
Part No.
Supply Voltage (V)
BU21101MWX
Resistive Type
2.7 to 3.6
MCU
Touch Detection
32bit
5-point
Host I/F
No. of Ch
Sensing Method
Panel Size (in)
Package
32
Mutual
5
UQFN040X5050M
Standby
Current (μA)
Operating
Current
Host I/F
Operating Temp.
Range (°C)
Package
I 2C
Supply
Voltage (V)
MCU
Resolution
Touch
Detection
BU21021GUL
2.7 to 3.6
32bit
4096×4096
2-/1-point
60
4.0mA
I2C/SPI
-20 to +85
2.65×2.70 t=0.55
BU21029GUL
1.65 to 3.6
-
4096×4096
2-/1-point
100
0.8mA
IC
-20 to +85
VCSP50L2
2.0×2.0 t=0.55
NEW BU21029MUV
1.65 to 3.6
-
4096×4096
2-/1-point
100
0.8mA
I2C
-20 to +85
VQFN020V4040
BU21024FV-M
2.7 to 3.6
8bit
1024×1024
2-/1-point
60
4.0mA
I2C/SPI
-40 to +85
BU21023GUL
2.7 to 3.6
8bit
1024×1024
2-/1-point
60
4.0mA
I C/SPI
-20 to +85
SSOP-B28
VCSP50L2
2.6×2.6 t=0.55
BU21023MUV
2.7 to 3.6
8bit
1024×1024
2-/1-point
60
4.0mA
I2C/SPI
-20 to +85
VQFN028V5050
BU21025GUL
1.65 to 3.6
-
4096×4096
1-point
0.8
120μA
I2C
-30 to +85
1.5×2.0 t=0.55
Part No.
2
2
VCSP50L2
VCSP50L2
Under Development
ROHM User Interface
Resistive Touchscreens
Capacitive Touchscreens
A broad lineup is offered that supports
High noise immunity touchscreen controller utilizing a
proprietary mutual-type, 1-layer multitouch AFE*
virtually any requirements, including
single-/dual-touch operation, automotive-
*AFE: Analog Front End
grade reliability, and even sets with no MCU.
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Advanced UI control technologies cultivated
through years of UI device development
Touchscreens for PCs
High accuracy, high noise cancelling
technology based on over a decade
of innovation
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Serial
A/D
Noise cancelling
technology based
on high S/N
characteristics
High sensitivity
capacitance
detection
technology
Capacitive Touch Switches
High noise immunity switches
developed using high-speed
sensing technology
The content specified in this document is correct as of September 1st, 2013.
[O_015]
56O6714E 09.2013
PDF
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