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부품번호 | BU21026MUV 기능 |
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기능 | 4-wire Resistive Touch Screen Controller | ||
제조업체 | ROHM Semiconductor | ||
로고 | |||
전체 23 페이지수
Datasheet
Resistive touch screen controller LSI series
4-wire Resistive
Touch Screen Controller
BU21026MUV
General Description
BU21026MUV is a low power 4-wire resistive touch
screen controller. BU21026MUV measures coordinates
and touch pressures with a 12bit A/D converter.
BU21026MUV has a digital filter for noise reduction.
Features
4-wire resistive touch screen controller
Single 1.65V to 3.60V supply.
Low standby current ( 0.8uA max)
12bit SAR A/D converter
2-wire serial interface
Command base interface
Digital filter
Touch pressure measurement
Auto power down control
Built-in clock oscillation circuit
.
Key Specifications
Power supply voltage
Temperature range
Standby current
Operating current
Coordinate resolution
1.65V to 3.60V
-30℃ to 85℃
0.8uA (Max.)
120uA (Typ.)
12Bits
Package
VQFN020V4040
W(Typ) x D(Typ) x H(Max)
4.00mm x 4.00mm x 1.00mm
Applications
Equipment with a built in user interface of 4-wire
resistive touch screen
Portable device such as smart phone, tablet, PDA.
Digital still camera, digital video camera, portable TV.
PC / PC peripheral equipment such as laptop PC,
touch screen monitor, printer.
VDD
Typical Application Circuit(s)
3
1.0μF 0.1μF
GND
Auxilary Input
10Ω
10Ω
0.1μF
0.1μF
AUX
XP
YP
BU21026
2
SDA
2.2kΩ
2.2kΩ
Master
( 2-wire serial
interface )
SDA
SCL SCL
INT GPIO
Touch
Screen
1
10Ω
0.1μF
XN
10Ω
0.1μF
YN
5
GND
4
AD1
AD0
GND
GND
1. 4-wire resistive touch screen
2. Pull-up resistor for 2-wire serial interface
3. Bypass capacitors
4. Diodes for ESD protection
5. Low pass filter for noise reduction
〇Product structure : Silicon monolithic integrated circuit
.www.rohm.com
© 2016 ROHM Co., Ltd. All rights reserved.
TSZ22111 • 14 • 001
〇This product has no designed protection against radioactive rays
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BU21026MUV
Block Diagram(s)
VDD
XP
YP
XN
YN
Touch Screen
Interface
Touch
Detection
A/D
Converter
Digital Filter
AUX
Control
Logic
&
2-wire Serial
Interface
INT
SDA
SCL
AD1
AD0
Power On
Reset
Clock
Oscillator
GND
Description of Block(s)
Power on Reset
BU21026MUV requests that the Power on Reset Timing should be observed. If the Power on Reset Timing not be observed,
BU21026MUV may wakeup with a random state. The touch detection and 2-wire serial interface is enabled after taking the
device ready time.
A/D Converter
BU21026MUV has a 12-bit Successive Approximation Resistor (SAR) Analog to Digital (A/D) converter. This A/D converter
is used for measuring X and Y position and Auxiliary input voltage. Output format is in straight binary as shown in below
table.
A/D Convertor Output Format
INPUT VOLTAGE
OUTPUT
(VREF - 1.5LSB) ~ VREF
FFFh
(VREF - 2.5LSB) ~ (VREF - 1.5LSB)
FFEh
(VREF - 3.5LSB) ~ (VREF - 2.5LSB)
FFDh
::
1.5LSB ~ 2.5LSB
002h
0.5LSB ~ 1.5LSB
001h
0 ~ 0.5LSB
000h
Note: VREF = VREFP – VREFN, LSB = VREF / 4095
Touch Screen I/F
A touch screen interface is consisted many switches. These switches are used for the driving screen voltage and selection
an input of the A/D converter. State of these switches is selected by a command that sent from the master.
www.rohm.com
© 2016 ROHM Co., Ltd. All rights reserved.
TSZ22111 • 15 • 001
4/19
TSZ02201-0L5L0FF00890-1-2
4.Aug.2016 Rev.001
4페이지 BU21026MUV
Power on Reset Timing Chart
1.65~3.60V
VDD
1.4V
0.2V
0V
tF_VDD
tOFF_VDD
tR_VDD
tRDY
(Unless otherwise specified Tj=25[℃], VDD=3.00[V], GND=0.00[V])
PARAMETER
Off period of VDD
Rise time for VDD
Fall time for VDD
Ready time for device
SYMBOL
tOFF_VDD
tR_VDD
tF_VDD
tRDY
MIN.
0.3
10
0.5
-
RATING
TYP.
-
-
-
-
MAX.
-
100
-
2
UNIT
s
us
ms
ms
CONDITION
2-wire Serial Interface Timing Chart
tHD_STA
tSU_DAT
tHD_DAT
tSU_STA
tHD_STA
tSU_STO
tBUF
SDA
tLOW
tHIGH
tR tF
SCL
START
CONDITION
(Unless otherwise specified Tj=25[℃], VDD=3.00[V], GND=0.00[V])
PARAMETER
SCL clock frequency
Hold time for (repeated) START condition
Low period of SCL
High period of SCL
Setup time for repeated START condition
Data hold time
Data setup time
Rise time for both SCL and SDA
Fall time for both SCL and SDA
Setup time for STOP condition
Bus free time between a STOP and START condition
SYMBOL
fSCL
tHD_STA
tLOW
tHIGH
tSU_STA
tHD_DAT
tSU_DAT
tR
tF
tSU_STO
tBUF
MIN.
-
0.6
1.3
0.6
0.6
0
100
20
20
0.6
1.3
REPEATED
START
CONDITION
RATING
TYP.
-
-
-
-
-
-
-
-
-
-
-
MAX.
400
-
-
-
-
0.9
-
300
300
-
-
STOP
CONDITION
START
CONDITION
UNIT
KHz
us
us
us
us
us
ns
ns
ns
us
us
CONDITION
www.rohm.com
© 2016 ROHM Co., Ltd. All rights reserved.
TSZ22111 • 15 • 001
7/19
TSZ02201-0L5L0FF00890-1-2
4.Aug.2016 Rev.001
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부품번호 | 상세설명 및 기능 | 제조사 |
BU21026MUV | 4-wire Resistive Touch Screen Controller | ROHM Semiconductor |
DataSheet.kr | 2020 | 연락처 | 링크모음 | 검색 | 사이트맵 |