BU21023GUL_16 Datasheet, PDF (8/21 Pages) Rohm – Resistive Type Touch Screen Controller ICs

BU21023GUL BU21023MUV BU21024FV-M
HOST-I/F mode (2-wire serial)
(SCL=SCL_SCK, SDA=SDA_SI)
The 2-wire serial mode presents an I²C interface for all practical purposes, but it is not a complete implementation
conforming to the I²C specification. BU21023MUV/BU21023GUL 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
tHD;STA
tSU;STO
SDA
tSU;DAT
tHD;DAT
SSCCL _L
Address
Condition : VDD = 3.0V Ta=25°C
Parameter
SCL Clock Frequency
START Condition Hold Time
SCL “L”
SCL “H”
Data Hold Time
Data Setup Time
STOP Condition Setup Time
S _ACK
T
A
R
T
R
Data
e
a
d
/
W
r
i
t
e
Symbol
Min
fSCL
0
ACK
Data
Limit
Typ
-
Unit
Max
400
kHz
tHD:STA
0.6
-
-
µs
tLOW
1.3
-
-
µs
tHIGH
0.6
-
-
µs
tHD:DAT
0.1
-
-
µs
tSU:DAT
0.1
-
-
µs
tSU:STO
0.6
-
-
µs
ACK
Conditions
・Write protocol
S SLAVE ADDRESS W A REGISTER ADDRESS A
7bit = 5Ch or 5Dh
8bit
WRITE DATA
AP
・Read protocol
S SLAVE ADDRESS W A REGISTER ADDRESS A S SLAVE ADDRESS R A
READ DATA
7bit = 5Ch or 5Dh
8bit
7bit = 5Ch or 5Dh
8bit
from Master to Slave
S = START condition
from Slave to Master
P = STOP condition
R = data direction READ (SDA HIGH)
W = data direction WRITE (SDA LOW)
A = acknowledge (SDA LOW)
N = not acknowledge (SDA HIGH)
S
T
O
P
NP
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7.June.2016 Rev.004