BU21024FV-M Datasheet, PDF (13/18 Pages) Rohm – Resistive Type Touch Screen Controller ICs

BU21023GUL,BU21023MUV,BU21024FV-M
Technical Note
●Application Circuit
【BU21023GUL/BU21023MUV】
BU21023GUL/MUV support 2 host interfaces (4-wire SPI and 2-wire serial bus).
The figures below are shown application circuit when each interface is used.
(Although BU21023GUL is CSP package, it is shown in similar figure for comparing.)
*Please connect the terminal of ECL/EDA with VSS, when firmware is download form HOST.
*Please insert TVS diode each sensor line from the perspective that enhances resistance to ESD.
*In 4-wire SPI using case, pull up INT terminal to VDD or host IO voltage (max4.5V).
If no using, connect to GND.
VDD
EEPROM
Host
VDD
10kohm
10kohm
10kohm
panel
YN
BU21023
XN
YP
XP
TVS diode
0.1uF
1.0uF 1.0uF
SO
(10kohm)
IFSEL
T3
T2
T1
EXT_CLK
RSTB
VDD
Example 1 : BU21023GUL/MUV application circuit(4-wireSPI)
In 2-wire serial interface using case,
please pull up INT, SCL_SCK, SDA_SI terminal to VDD or host IO voltage(max4.5V).
VDD
EEPROM
10kohm
10kohm
Host
VDD
10kohm
10kohm
10kohm
panel
YN
BU21023
XN
YP
XP
TVS diode
0.1uF
1.0uF 1.0uF
SO
IFSEL
T3
T2
T1
EXT_CLK
RSTB
VDD
Example 2 : BU21023GUL/MUV application circuit(2-wire Serial bus)
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13/17
2011.08 - Rev.A