BU21021GUL Datasheet, PDF (2/13 Pages) Rohm – 4-wire resistive Touch Screen Controller

BU21021GUL
Datasheet
●Pin Layout
1
A
T4
2
3
4
5
PVDD
DVDD
VDD
DVSS
B
XP
AVDD
AVSS
DVDD_EXT
C
XN
YP
RSTB
T1
T2
D
YN
SEL_CSB
SO
T3
IFSEL
E
ECL
EDA
SCL_SCK
SDA_SI
INT
Top view
Figure 2. Pin Layout
●Pin Descriptions
Pin no. Pin Name I/O
Description
D1
YN
I/O YN channel input.
C1
XN
I/O XN channel input.
C2
YP
I/O YP channel input.
B1
XP
I/O XP channel input.
A1
T4
I/O Test input / output.
A2
PVDD
O Regulator output for touch screen voltage supply.
B3
AVDD
O Regulator output for analog circuit.
A2
DVDD
I/O Regulator output for digital circuit
B4
AVSS
-
Analog ground.
A4
VDD
-
Chip power supply.
A5
DVSS
-
Digital ground.
B5 DVDD_EXT I
Digital power supply select. （L=internal、H=external）
C3
RSTB
I
Reset (Low active)
C4
T1
I
Test input.
C5
T2
I
Test input.
D4
T3
I
Test input.
D5
IFSEL
I
Host interface select. (L=4-wire SPI, H=2-wire serial)
D3
SO
O
2-wire serial High impedance
4-wire SPI Data output
E5
INT
O Interrupt
D2
SEL_CSB
I
2-wire serial Slave address select
4-wire SPI Chip select
E4
SDA_SI I/O 2-wire serial Data input / output
4-wire SPI Data input
E3
SCL_SCK
I
2-wire serial Clock input
4-wire SPI Clock input
E2
EDA
I/O SDA for EEPROM
E1
ECL
I/O SCL for EEPROM
(*1) Bypass AVDD and DVDD to GND with 1.0 uF capacitor and PVDD and T4 need terminal opening.
(*2) Digital voltage can be supplied by DVDD when DVDD_EXT=H.
(*3) ECL and EDA need pull-up with 4.7kΩ resister in use case. If not use, connect to GND.
(*4) SCL_SCK and SDA_SI need pull-up with over 4.7kΩ resister and SO need terminal opening when use 2-wire serial I/F.
(*5) Above parameters are only recommended for use. Absolute reliability is not guaranteed.
(*6) When VDD is not supplied, state of RSTB=”H” is prohibition.
Equivalent
circuit
D
D
D
D
D
D
D
D
-
-
-
A
C
A
A
A
A
O
E
I
I/O
I
B
B
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TSZ22111・15・001
2/10
TSZ02201-0Y1Y0F300060-1-2
19.Jun.2012 Rev.001