BU21010MUV Datasheet, PDF (5/15 Pages) Rohm – Capacitive Sensor Switch Control IC

BU21010MUV
●HOST I/F
・ 2 wire serial, BUS
Slave mode only
Slave Address = 5Eh
Normal （Normal mode. 100kHz Transfer rate）
Fs mode (Fast mode. 400kHz Transfer rate) also.
Not adapting sequential read / write.
【Data format】
SDA
t_HD;STA
SCL
START
Address
Read
ACK
t_SU;DAT
Data
ACK
Technical Note
t_HD;DAT
t_SU;STO
Data
ACK
STOP
Parameter
fSCL : SCL Clock Freq
tHD;STA : START condition hold time
tLOW : SCL “L”
tHIGH : SCL “H”
tHD;DAT : Data hold time
tSU;DAT : Data setup time
tSU;STO : START condition hold time
tBUF : Free time of bus between STOP condition and START
condition
Standard mode
MIN
MAX
0
100
4.0
-
4.7
-
4.0
-
0.1
3.45
0.25
-
4.0
-
4.7
-
High Speed mode
MIN
MAX
0
400
0.6
-
1.3
-
0.6
-
0.1
0.9
0.1
-
0.6
-
1.3
-
Unit
kHz
μsec
μsec
μsec
μsec
μsec
μsec
μsec
【PROTOCOL】
・Write Protocol
S SLAVE ADDRESS W A
7bit = 5Eh
・Read Protocol
REGISTER
ADDRESS
8bit
S SLAVE ADDRESS W A
REGISTER
ADDRESS
7bit = 5Eh
8bit
from Master to Slave
from Slave to Master
A
WRITE DATA
AP
8bit
A S SLAVE ADDRESS R A
READ DATA
7bit = 5Eh
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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5/14
2009.04 - Rev.B