BU21026MUV Datasheet, PDF (1/23 Pages) Rohm – 4-wire Resistive Touch Screen Controller

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
XN
0.1μF
YN
10Ω
0.1μF
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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TSZ02201-0L5L0FF00890-1-2
4.Aug.2016 Rev.001