BU21028FV-M Datasheet, PDF (1/36 Pages) Rohm – 4-wire Resistive Touch Screen Controller

Datasheet
Resistive touch screen controller LSI series for Automotive
4-wire Resistive
Touch Screen Controller
BU21028FV-M
General Description
Unlike most resistive touch screen controllers, the
BU21028FV-M 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
 AEC-Q100^{(Note 1)}
 standard 4-wire resistive touch screens
 Single and dual touch detection
 I2C-like interface (for the host processor I/F)
 12-bit resolution
 Single 2.7V to 3.6V power supply
 Auto power down/on control
 Built-in clock oscillator circuit
(Note1: Grade 3)
Key Specifications
 Power supply voltage:
 Temperature range:
 Standby current:
 Sleep current:
 Operating current:
 Coordinate resolution:
2.7V to 3.6V
-40°C to +85°C
1.0 μA(Max)
100 μA(Max)
0.8 mA(Typ)
12bit
Package(s)
SSOP-B20
W(Typ) x D(Typ) x H(Max)
6.50 mm x 6.40 mm x 1.15 mm
Applications
■ Equipment with built-in user interface for 4-wire
resistive touch screen
■ Portable information equipment like smart phones,
tablets, and PDAs
■ PCs or peripheral equipment like laptops, touch
screen monitors, and printers
■ audioIn-vehicle terminals such as car navigation
system, car audio system and display audio
systems
Typical Application Circuit(s)
VDD
Host IO VDD
Y+
X-
X+
4- wire
Y-
resistive
touch
option(*3)
screen
option(*1)
10ohm
1.0nF
10ohm
XP
XN
1.0nF
10ohm
YP
1.0nF
10ohm
YN
1.0nF
AUX
BU21028FV-M
RSTB
SCL
SDA
INT
AD0
AD1
option(*4)
33ohm
33ohm
33ohm
option(*2)
33ohm
Host
(GPIO port）
Option(*1) For the touch panel noise reduction
(Please choose the fixed valuse to environment, a demand)
Option(*2) Please connect to VDD, when use as Slave address = 41h
Option(*3) For ESD protection (Zener diode / TVS diode)
Option(*4) Damping resistance
(Please choose the fixed valuse to environment, a demand)
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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TSZ02201-0L5L0F300720-1-2
27.May.2016 Rev.002