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PDF BU21029MUV Data sheet ( Hoja de datos )
| Número de pieza | BU21029MUV | |
| Descripción | 4-wire Resistive Touch Screen Controller | |
| Fabricantes | ROHM Semiconductor | |
| Logotipo |  |
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Datasheet
4-wire Resistive
Touch Screen Controller
BU21029MUV
●General Description
Unlike most resistive touch screen controllers, the
BU21029MUV 4-wire resistive touch-screen controller
can generate data that enables dual touch detection.
The Host processor can use this data to detect single
and dual point coordinates.
●Features
■ Single and dual touch detection for standard 4-wire
resistive touch screens
■ I2C-like interface for interfacing with the host
processor
■ 12-bit resolution
■ Single 1.65V to 3.60V supply
■ Power on reset
■ Auto power down control
■ Built-in clock oscillator circuit
●Key Specifications
■ Power supply voltage
■ Temperature range
■ Standby current
■ Sleep current
■ Operating current
■ Coordinate resolution
1.65[V]～3.60[V]
-20[℃]～85[℃]
1.0[uA] (Max.)
100[uA] (Typ.)
0.8[mA] (Typ.)
12bit
●Package
VQFN020V4040
4.00 mm x 4.00 mm x 1.00 mm
●Applications
■ Equipment with built-in user interface for 4-wire
resistive touch screen
■ Portable information equipment like smart phones,
tablets, and PDAs
■ Audio-visual equipment like digital still cameras,
digital video cameras, and portable TVs
■ PCs or peripheral equipment like laptops, touch
screen monitors, and printers
●Typical Application Circuit
〇Product structure : Silicon monolithic integrated circuit
.www.rohm.co.jp
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ22111 • 14 • 001
〇This product has no designed protection against radioactive rays
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TSZ02201-0Y1Y0F300110-1-2
11.Nov.2013 Rev.004
1 page  
BU21029MUV
●Host interface AC timing
The slave address for 2-wire serial interface is selectable from “40h” or “41h” by “AD0” input.
AD0 = “L” : Slave Address = 40h
AD0 = “H” : Slave Address = 41h
Datasheet
2-wire serial I/F AC timing characteristics (Ta=25℃, VDD=PVDD=3.00V, GND=0.00V, unless otherwise noted)
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
0.6
1.3
0.6
0.6
0
0.1
20
20
0.6
1.3
RATING
TYP.
-
-
-
-
-
-
-
-
-
-
-
MAX.
400
-
-
-
-
0.9
-
300
300
-
-
UNIT
kHz
us
us
us
us
us
us
ns
ns
us
us
CONDITION
www.rohm.co.jp
© 2011 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
5/26
TSZ02201-0Y1Y0F300110-1-2
11.Nov.2013 Rev.004
5 Page 
BU21029MUV
Datasheet
●Specification of Touch Detection
BU21029MUV executes its touch detection function by outputting an interrupt signal at pin INT once it is able to detect
touch. The circuit diagram of the touch detection function is shown on the following figure.
PVDD
INT
Short when touch
screen is touched
YP
XP
50kΩ
90kΩ
PU90K
(register)
Control
Logic
High when XP or YP
dirvers ON
YN
ON
PGND
GND
Figure 4. Touch detection circuit
When the touch panel is connected to the panel interface terminals (XP, XN, YP, YN), pin XP is connected to PVDD
through an internal pull-up resistor inside the IC and pin YN is connected to PGND. During a no-touch state, BU21029MUV
will be on standby. During this time, INT outputs "H" through an internal pull-up resistor. Since pins XP and YN are
connected to the touch screen through contact resistance, the resistance ratio of the internal pull-up resistance and the
touch screen resistance is able to detect the voltage drop at pin XP whenever the screen is touched. This results to an "L"
output at INT.
When touch is detected and pins XP and YP is put to drive state by each scanning operation, the internal pull-up resistance
is disconnected from pin XP and the output of pin INT is held at "L".
www.rohm.co.jp
© 2011 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
11/26
TSZ02201-0Y1Y0F300110-1-2
11.Nov.2013 Rev.004
11 Page | ||
| Páginas | Total 29 Páginas | |
| PDF Descargar | [ Datasheet BU21029MUV.PDF ] | |
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