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PDF BU21028FV-M Data sheet ( Hoja de datos )
| Número de pieza | BU21028FV-M | |
| Descripción | 4-wire Resistive Touch Screen Controller | |
| Fabricantes | ROHM Semiconductor | |
| Logotipo |  |
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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)
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
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
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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1 page  
BU21028FV-M
Absolute Maximum Ratings
Parameter
Symbol
Rating
Unit Conditions
Power supply voltage
VDD
-0.3 to 4.5
V
Power supply voltage for
touch screen
Digital input voltage
VDDP
VIN1
-0.3 to 4.5
-0.3 to VDD+0.3
V
V
AD0,AD1,SDA,
SCL and RSTB
AUX input voltage
VIN2 GND-0.3 to 2.5 V AUX
Voltage input to
touch screen Interface
VIN3
GND-0.3 to 2.5
V
XP,YP,XN
and YN
Storage temperature range
Tstg
-50 to 125
℃
Caution: Operating the IC over the absolute maximum ratings may damage the IC. The damage can either be a short circuit between pins or an open circuit
between pins and the internal circuitry. Therefore, it is important to consider circuit protection measures, such as adding a fuse, in case the IC is operated over
the absolute maximum ratings.
Thermal Resistance(Note 1)
Parameter
Symbol
Thermal Resistance (Typ)
1s(Note 3)
2s2p(Note 4)
Unit
SSOP-B20
Junction to Ambient
θJA 115.4
57.3 °C/W
Junction to Top Characterization Parameter(Note 2)
ΨJT 10
8 °C/W
(Note 1)Based on JESD51-2A(Still-Air)
(Note 2)The thermal characterization parameter to report the difference between junction temperature and the temperature at the top center of the outside
surface of the component package.
(Note 3)Using a PCB board based on JESD51-3.
Layer Number of
Measurement Board
Material
Single
FR-4
Board Size
114.3mm x 76.2mm x 1.57mmt
Top
Copper Pattern
Footprints and Traces
Thickness
70μm
(Note 4)Using a PCB board based on JESD51-7.
Layer Number of
Measurement Board
Material
4 Layers
FR-4
Top
Copper Pattern
Footprints and Traces
Thickness
70μm
Board Size
114.3mm x 76.2mm x 1.6mmt
2 Internal Layers
Copper Pattern
Thickness
74.2mm x 74.2mm
35μm
Bottom
Copper Pattern
74.2mm x 74.2mm
Thickness
70μm
www.rohm.com
© 2016 ROHM Co., Ltd. All rights reserved.
TSZ22111 • 15 • 001
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TSZ02201-0L5L0F300720-1-2
27.May.2016 Rev.002
5 Page 
BU21028FV-M
●WRITE CYCLE
The host first sends an address byte to the BU21028FV-M controller. This address byte is composed of the 7-bit slave byte
on the upper seven bits and the Read/Write bit on the LSB. If the controller receives a valid address byte, it issues an
acknowledgement. The host processor can transmit a command only after receiving the acknowledgement for the address
byte from the controller. The controller then sends back another acknowledgement, allowing the host to continually send
write data or issue a STOP command.
Write : Convert function
S Slave address 0 A
Command Byte
AP
1
C
F
3
C
F
2
C
F
1
C
F
0
C
M
S
K
P
D
M
S
T
P
Write : Register write
S Slave address
S：START condition
0A
Command Byte
A
Data Byte 0
Address = start address
0
A
D
R
3
A
D
R
2
A
D
R
1
A
D
R
0
P
A
G
E
S
W
R
S
T
S
T
P
P：STOP condition A：ACK N：NACK
Figure 1. Write Protocol
A
Data Byte N
Address = start address + N
AP
●READ CYCLE
The READ bit is the LSB of the address byte. When read mode is selected, BU21028FV-M sends back the data byte
followed by an acknowledgement to the host. The data sent back is either the conversion result or the register value,
depending on the last command byte received by BU21028FV-M. The host needs to resend the conversion command with
setting "CMSK=1" if it has read the register value before reading the conversion result. BU21028FV-M sends the next data
byte after it has received an acknowledgement from the host for the previous data byte. Upon receiving the last data byte,
the host finishes read access by issuing a START (or STOP) commands followed by NACK (not acknowledged) command.
Read cycle
S Slave address
S：START condition
1A
Data Byte 0
address = start address
A
Data Byte 1
address = start address + 1
P：STOP condition A：ACK N：NACK
Figure 2. Read Protocol
A
Data Byte N
address = start address + N
NP
●SCL STRETCH
If the host reads the conversion result while conversion is ongoing, BU21028FV-M notifies it through the SCL_STRETCH
function. (*1) SCL_STRECH is released when conversion function is finished.
SCL
SDA
STATUS
1000000
Slave address & Read cycle
Convert function is running
1
A
C D7 D6
K
finish
(idle)
Stretch(SCL=L)
Figure 3. SCL Stretch Timing
www.rohm.com
© 2016 ROHM Co., Ltd. All rights reserved.
TSZ22111 • 15 • 001
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TSZ02201-0L5L0F300720-1-2
27.May.2016 Rev.002
11 Page | ||
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| PDF Descargar | [ Datasheet BU21028FV-M.PDF ] | |
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