BU21009MUV Datasheet, PDF (6/14 Pages) Rohm – Capacitive Sensor Switch Control IC

BU21009MUV
●HOST I/F
・ 2 wire serial, BUS (Pin configuration, MODE［1:0］＝00b)
Slave mode only
Slave Address = 5Ch,5Dh selection possible.
Normal (Normal mode. 100kHz Transfer rate)
Fs mode (Fast mode. 400kHz Transfer rate) also.
Not adapting sequential read / write.
【Data format】
Technical Note
SDA
SCL
t_HD;STA
t_SU;DAT
Address
Read
ACK
Data
ACK
t_HD;DAT
Data
ACK
t_SU;STO
Parameter
fSCL : SCL Clock Freq
t_HD;STA : START condition hold time
t_LOW : SCL “L”
t_HIGH : SCL “H”
t_HD;DAT : Data hold time
t_SU;DAT : Data setup time
t_SU;STO : START condition hold time
t_BUF : 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 = 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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6/13
2009.04 - Rev.B