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부품번호 | BU21025GUL 기능 |
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기능 | 4-wire Resistive Touch Screen Controller | ||
제조업체 | ROHM Semiconductor | ||
로고 | |||
전체 19 페이지수
Datasheet
4-wire Resistive
Touch Screen Controller
BU21025GUL
●General Description
BU21025GUL is a low power 4-wire resistive touch
screen controller. BU21025GUL measures coordinates
and touch pressures with a 12bit A/D converter.
BU21025GUL 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
VCSP50L2
W (Typ.) x D (Typ.) x H (Max.)
2.00 mm x 1.50 mm x 0.55mm
●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.
●Typical Application Circuit
VDD
3
1.0μF 0.1μF
GND
Auxilary Input
10Ω
10Ω
0.1μF
0.1μF
AUX
XP
YP
Touch
Screen
1
10Ω
0.1μF
XN
10Ω
0.1μF
YN
5
GND
4
1. 4-wire resistive touch screen
2. Pull-up resistor for 2-wire serial interface
3. Bypass capacitors
4. Diodes for EDS protection
5. Low pass filter for noise reduction
BU21025
GND
2
SDA
2.2kΩ
2.2kΩ
Master
( 2-wire serial
interface )
SDA
SCL SCL
INT GPIO
AD1
AD0
GND
○Product structure:Silicon monolithic integrated circuit
.www.rohm.com
© 2012 ROHM Co., Ltd. All rights reserved.
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○This product is not designed protection against radioactive rays
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BU21025GUL
Datasheet
●2-wire Serial Interface
BU21025GUL supports a 2-wire serial interface A device that controls transfer is called a master. A device that controlled by
the master is called a slave. BU21025GUL is a slave device.
BU21025GUL has a write protocol and a read protocol. The write protocol consists of a start condition, an address byte, a
command byte, and a stop condition. The read protocol consists of a start condition, an address byte, one or two data bytes,
and a stop condition.
Start Condition
BU21025GUL recognizes as a start condition that falling edge of SDA while SCL is set “H”. If the start condition is received,
BU21025GUL will be in the state that can be transfer and received data. When the start condition is fulfilled, BU21025GUL
recognize the (repeated) start condition also in data transfer.
Stop Condition
BU21025GUL recognizes as a stop condition that rising edge of SDA while SCL is set “H”. If the stop condition is received,
BU21025GUL will be in the state that can not be transfer and received data.
Data Transfer
Data is transferred with the most significant bit (MSB) first and 8-bits long. Each byte has to be followed by an acknowledge
bit. A Timing of SDA data receiving is rising edge of SCL. A state of SDA can only change when SCL set to “L”. If SDA is
changed while SCL is set “H”, a start or stop condition will recognized by BU21025GUL.
Acknowledge Bit (sending)
After the master sends a byte to BU21025GUL, an acknowledge bit is used in order that BU21025GUL may return a
response to the master. At this time, the master needs to set SDA into a high impedance state. When BU21025GUL
receives effectively data, it sets SDA to “L” (ACK). Otherwise SDA is set to “H” (NACK).
Acknowledge Bit (receiving)
After the master receives a byte from BU21025GUL, an acknowledge bit is used for judgment of whether BU21025GUL
continues data transfer. In this case, the master needs to set SDA. When SDA is set to “L” (ACK), BU21025GUL continues
data transfer. When SDA is set to “H” (NACK), BU21025GUL ends data transfer.
Address Byte
BU21025GUL recognizes one byte data as an address byte after a start condition. The address byte is consisted a 7-bit
slave address and a read-write bit. If a received slave address is matched with its one, BU21025GUL issues an
acknowledge to the master. Otherwise BU21025GUL doesn’t issue an acknowledge to the master and stops data transfer.
Upper 5 bits of the 7-bit slave address are “10010”. And lower 2 bits of the 7-bit slave address are programmable by AD1
and AD0. The read-write bit (R/WB) determines direction. When it is ‘1’, the master reads from BU21025GUL. When it is ‘0’,
the master writes to BU21025GUL.
BIT
NAME
SLAVE
MSB
7
S6
1
6
S5
0
Table 1. Address Byte
543
S4 S3 S2
010
LSB
210
S1 S0 R/WB
AD1 AD0
-
BIT 7-1 : S6-0
Slave address
BIT 0 : R/WB
0: The master writes to BU21025GUL
1: The master reads from BU21025GUL.
www.rohm.com
© 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
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4페이지 BU21025GUL
Datasheet
Write Protocol
An command write is started in BU21025GUL when the master sends the start condition, the slave address of
BU21025GUL, and zero in bit 0( 8th bit) for writing, as shown in Table 1. If the slave address is matched with its own,
BU21025GUL issues an acknowledge to the master. When the master receives the acknowledge from BU21025GUL, the
master send the command byte. When BU21025GUL received next 8 bits, it issues another acknowledge to the master.
After the acknowledge is received by the master, the master sends the stop or repeated start condition for ending write.
Figure 1. Write Protocol
If a receiving command in BU21025GUL is not the software reset or setup, BU21025GUL starts driving screen voltage
when C0 is latched by rising edge of SCL. Next, if the received type of operation code is measurement, BU21025GUL starts
acquisition in A/D converter when next falling edge of SCL. BU21025GUL stops acquisition and starts A/D conversion when
BU21025GUL receive the stop or repeated start condition.
When BU21025GUL receives a command other than software reset during the A/D conversion, the command is ignored.
And if the command is ignored, BU21025GUL doesn’t return an acknowledge at the ACK timing behind the command byte.
(18th timing in Figure. 1)
www.rohm.com
© 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
7/15
TSZ02201-0Y2Y0F300050-1-2
7.AUG.2012 Rev.002
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부품번호 | 상세설명 및 기능 | 제조사 |
BU21025GUL | 4-wire Resistive Touch Screen Controller | ROHM Semiconductor |
DataSheet.kr | 2020 | 연락처 | 링크모음 | 검색 | 사이트맵 |