BU21024FV-M_14 Datasheet, PDF (7/20 Pages) Rohm – Resistive Type Touch Screen Controller ICs

BU210243FGVU-LM BU21023MUV BU21024FV-M
Datasheet
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. 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
Min
f_SCL
0
t_HD:STA
0.6
t_LOW
1.3
t_HIGH
0.6
t_HD:DAT
0.1
t_SU:DAT
0.1
t_SU:STO
0.6
Limit
Typ
-
-
-
-
-
-
-
Unit
Max
400
kHz
-
µs
-
µs
-
µs
-
µs
-
µs
-
µs
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)
NP
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31.Mar.2014 Rev.003