BU21024FV-M Datasheet, PDF (4/18 Pages) Rohm – Resistive Type Touch Screen Controller ICs

BU21023GUL,BU21023MUV,BU21024FV-M
Technical Note
●HOST-I/F mode (2-wire serial)
(SCL=SCL_SCK, SDA=SDA_SI)
The 2-wire serial mode presents an I²C like interface for all practical purposes, but it is not a complete implementation
conforming to the I²C specification. The BU21023MUV/ BU21023GUL / BU21024FV-M devices can co-exist with other I²C
devices on the same bus. The slave address for 2-wire serial communication is 5Ch or 5Dh. This is determined by the
SEL_CSB pin.
SEL_CSB = “L”
SEL_CSB = “H”
: Slave address = 5Ch
: Slave address = 5Dh
SDA
t_HD;STA
SSCCL _L
Address
t_SU;DAT
t_HD;DAT
t_SU;STO
ACK
Data
ACK
Data
ACK
Parameter
SCL clock frequency
START condition hold time
SCL “L”
SCL “H”
Data hold time
Data setup time
STOP condition setup time
Symbol
f_SCL
t_HD:STA
t_LOW
t_HIGH
t_HD:DAT
t_SU:DAT
t_SU:STO
Min.
0
0.6
1.3
0.6
0.1
0.1
0.6
Limits
Typ.
-
-
-
-
-
-
-
Max.
Unit
400
kHz
-
µs
-
µs
-
µs
-
µs
-
µs
-
µs
Condition
・Write protocol
S SLAVE ADDRESS W A
7bit = 5Ch or 5Dh
・Read protocol
REGISTER
ADDRESS
8bit
S SLAVE ADDRESS W A
REGISTER
ADDRESS
7bit = 5Ch or 5Dh
8bit
from master to slave
from slave to master
A
WRITE DATA
AP
8bit
A S SLAVE ADDRESS R A
READ DATA
7bit = 5Ch or 5Dh
8bit
S = START condition
P = STOP condition
R = data direction READ (SDA HIGH)
W = data direction WRITE (SDA LOW)
A = acknowledge (SDA LOW)
N = not acknowledge (SDA HIGH)
NP
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4/17
2011.08 - Rev.A