BU21077MUV Datasheet, PDF (5/16 Pages) Rohm – Capacitive Switch Controller IC

BU21077MUV
Host Interface
BU21077MUV has 2-wire serial bus interface. It is compatible with I2C protocol and BU21077MUV is a slave device.
Slave address of BU21077MUV is 5Ch (Shown 7-bit). And it supports Standard-mode (100 KHz) and Fast-mode (400
kHz). It has sequential read for reduce access time.
SDA
SCL
1-7
89
S
START Address R/W ACK
1-7
8
9
Data
ACK
1-7
Data
89
NACK
/ ACK
P
STOP
Figure 7. 2-wire Serial Bus Interface Data Format
SDA
tHD;STA
SCL
tLOW
START
condition
tSU;DAT
tHD;STA
tHD;DAT
tHIGH
tSU;STA repeated
START
condition
Figure 8. 2-wire Serial Bus Interface Timing Chart
tBUF
tSU;STO
STOP
condition
START
condition
Parameter
SCL Clock Frequency
Hold Time for ( Repeated ) START Condition
Low Period of SCL
High Period of SCL
Data Hold Time
Data Setup Time
Setup Time for Repeated Start Condition
Setup Time for STOP Condition
Bus Free Time Between STOP and START Condition
Symbol
Standard-mode
Min
Max
Fast-mode
Unit
Min
Max
fSCL
0
100
0
400 kHz
tHD;STA
4.0
-
0.6
-
μs
tLOW
4.7
-
1.3
-
μs
tHIGH
4.0
-
0.6
-
μs
tHD;DAT
0.1
3.45
0.1
0.9
μs
tSU;DAT
0.25
-
0.1
-
μs
tSU;STA
4.7
-
0.6
-
μs
tSU;STO
4.0
-
0.6
-
μs
tBUF
4.7
-
1.3
-
μs
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TSZ02201-0L5L0F300820-1-2
14.Jul.2016 Rev.002