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PDF BU21049GUL Data sheet ( Hoja de datos )
| Número de pieza | BU21049GUL | |
| Descripción | 4-wire Resistive Touch Screen Controller | |
| Fabricantes | ROHM Semiconductor | |
| Logotipo |  |
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BU21049GUL
4-wire Resistive
Touch Screen Controller
BU21049GUL
●General Description
Unlike most resistive touch screen controllers, the
BU21049GUL 4-wire resistive touch-screen controller
generate data to enable dual touch detection.
The Host processor can use data to detect single point
coordinates and dual coordinates.
●Features
■ Enables single touch and dual touch using
standard 4-wire resistive touch screen
■ I2C like interface for interfacing to the host
processor
■ 12-bit Resolution
■ Single 1.65V to 3.60V Supply.
■ Power on reset
■ Auto power down control
■ Built-in clock oscillation circuit
●Typical Application Circuits
●Key Specifications
■ Power supply voltage
■ Temperature range
■ Standby current
■ Sleep current
■ Operating current
■ Coordinate resolution
1.65V～3.6.0V
-20[℃]～85[℃]
1.0uA (Max.)
100uA (Typ.)
0.8mA(Typ.)
12bit
●Packages
VCSP50L2
2.00 ㎜ × 2.00 ㎜ × 0.55(max) ㎜
●Applications
■ Equipment with a built in the user interface of 4-wire
resistive touch screen
■ Portable information equipment like as Smart phone,
Table, PDA.
■ Audio-visual equipment like as Digital still camera,
Digital video camera, portable TV.
■ PC/ PC peripheral equipment like as Laptop, Touch
screen monitor, printer.
○Product structure：Silicon monolithic integrated circuit
.www.rohm.co
© 2011 ROHM Co., Ltd. All rights reserved.
TSZ22111・14・001
○This product is not designed protection against radioactive rays
1/23
TSZ02201-0Y1Y0F300010-1-2
31.JAN.2012 Rev.001
1 page  
BU21049GUL
●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
Symbol
MIN
Rating
TYP
MAX
Unit
Condition
SCL clock frequency
fSCL
0
- 400 kHz
START condition hold time
tHD:STA
0.6
-
- us
SCL “L” period
tLOW
1.3
-
- us
SCL “H” period
tHIGH
0.6
-
- us
Data hold time
tHD:DAT
0.0
-
- us
Data setup time
tSU:DAT
0.1
-
- us
STOP condition setup time
tSU:STO
0.6
-
- us
www.rohm.co
© 2011 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
5/23
TSZ02201-0Y1Y0F300010-1-2
31.JAN.2012 Rev.001
5 Page 
BU21049GUL
Datasheet
●Specification of touch detection
The BU21049GUL builds in the touch detection function for outputting the interrupt signal to the INT pin during detect touch.
The equivalent circuit schematic of a touch detection function is shown in the following figure.
PVDD
INT
Short when touch
screen is touched
YP
50kΩ
90kΩ
PU90K
(register)
XP
High when XP or YP
dirvers ON
YN
ON
PGND
GND
Control
Logic
When the touch panel is connected to the panel interface terminal (XP, XN, YP, YN), XP pin is connected to PVDD through
internal pull-up resistance inside IC, the YN pin connects with PGND, and the BU21049GUL will be in a standby state at the
no-touch. At this time, the INT pin outputs "H" by an internal pull-up.
Since the XP pin and the YN pin are connected through the contact resistance of a touch screen when a touch screen is
touched, the resistance ratio of internal pull-up resistance and touch screen resistance detects the voltage drop of the XP
pin, and it outputs "L" from the INT pin.
Moreover, when a touch is detected and the XP pin or the YP pin changes into a drive state by each scanning operation,
internal pull-up resistance is separated from the XP pin, and the "L" output of the INT pin is held.
www.rohm.co
© 2011 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
11/23
TSZ02201-0Y1Y0F300010-1-2
31.JAN.2012 Rev.001
11 Page | ||
| Páginas | Total 26 Páginas | |
| PDF Descargar | [ Datasheet BU21049GUL.PDF ] | |
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