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Technical Note
4/17
www.rohm.com
2011.08 - Rev.A
© 2011 ROHM Co., Ltd. All rights reserved.
BU21023GUL,BU21023MUV,BU21024FV-M
HOST-I/F mode (2-wire serial)
(SCL=SCL_SCK, SDA=SDA_SI)
The 2-wire serial mode presents an I
2C like interface for all practical purposes, but it is not a complete implementation
conforming to the I
2C 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”
: Slave address = 5Ch
SEL_CSB = “H”
: Slave address = 5Dh
Parameter
Symbol
Limits
Unit
Condition
Min.
Typ.
Max.
SCL clock frequency
fSCL
0
-
400
kHz
START condition hold time
tHD:STA
0.6
-
-
µs
SCL “L”
tLOW
1.3
-
-
µs
SCL “H”
tHIGH
0.6
-
-
µs
Data hold time
tHD:DAT
0.1
-
-
µs
Data setup time
tSU:DAT
0.1
-
-
µs
STOP condition setup time
tSU:STO
0.6
-
-
µs
Write protocol
S
SLAVE ADDRESS
W
A
REGISTER
ADDRESS
A
WRITE DATA
AP
7bit = 5Ch or 5Dh
8bit
8bit
Read protocol
S
SLAVE ADDRESS
W
A
REGISTER
ADDRESS
A
S SLAVE ADDRESS R A
READ DATA
N
P
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)
SDA
SCL
Address
ACK
ACK
ACK
Data
Data
tHD;STA
tSU;STO
tSU;DAT
tHD;DAT
SDA
SCL


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