BU21024FV-M Datasheet, PDF (14/18 Pages) Rohm – Resistive Type Touch Screen Controller ICs

BU21023GUL,BU21023MUV,BU21024FV-M
Technical Note
【BU21024FV-M】
BU21024FV-M 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 VDD
VDD
panel
10kohm
EEPROM
TVS diode
10kohm
1 ^EDA
SCL_SCK 28
2 ECL
SDA_SI 27
3 YNM
SEL_CSB 26
4 XNM
5 ^YPM
INT 25
SO 24
6 XPM
IFSEL 23
7 ^YN
8 XN
BU21024FV-M
T3 22
T2 21
9 YP
T1 20
10 XP
CLK_EXT 19
11 T4
0.1uF
12 PVDD
1.0uF
1.0uF
13 AVDD
14 DVDD
RSTB 18
VSS 17
VDD
VDD 16
DVDD_EXT 15
10kohm
Host
(10kohm)
Example 3 : BU21024FV-M Application Circuit(4-wireSPI)
VDD VDD
VDD
panel
10kohm
EEPROM
TVS diode
10kohm
1 ^EDA
SCL_SCK 28
2 ECL
SDA_SI 27
3 YNM
SEL_CSB 26
4 XNM
5 ^YPM
INT 25
SO 24
6 XPM
IFSEL 23
7 ^YN
8 XN
BU21024FV-M
T3 22
T2 21
9 YP
T1 20
10 XP
CLK_EXT 19
11 T4
0.1uF
12 PVDD
1.0uF
1.0uF
13 AVDD
14 DVDD
RSTB 18
VSS 17
VDD
VDD 16
DVDD_EXT 15
10kohm
Host
VDD
Example 4 : BU21024FV-M Application Circuit(2-wire Serial bus)
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14/17
2011.08 - Rev.A