BU21170MUV Datasheet, PDF (18/33 Pages) Rohm – Capacitive Switch Controller IC

BU21170MUV
・Byte Write
S
WA
A
T
SLAVE
RC
REGISTER
C
A
ADDRESS
IK
ADDRESS
K
R (= 0x4C or 0x4D) T
(n)
T
E
WRITE
DATA
(n)
AS
CT
KO
P
SSSSSSS
AAAAAAA
6543210
RRRRRRRR
AAAAAAAA
76543210
WWWWWWWW
DDDDDDDD
76543210
SA : Slave Address
RA : Register Address
RD : Read Data
WD : Write Data
・Random Read
S
WA
T
SLAVE
RC
A
ADDRESS
IK
R (= 0x4C or 0x4D) T
T
E
REGISTER
ADDRESS
(n)
AS
CT
KA
R
T
SLAVE
ADDRESS
(= 0x4C or 0x4D)
RA
EC
AK
D
READ
DATA
(n)
NS
AT
CO
KP
SSSSSSS
AAAAAAA
6543210
RRRRRRRR
AAAAAAAA
76543210
SSSSSSS
AAAAAAA
6543210
RRRRRRRR
DDDDDDDD
76543210
・Sequential Read
S
WA
AS
RA
A
T
SLAVE
RC
REGISTER
CT
SLAVE
EC
READ
C
A
ADDRESS
IK
ADDRESS
KA
ADDRESS
AK
DATA
K
R (= 0x4C or 0x4D) T
(n)
R (= 0x4C or 0x4D) D
(n)
T
E
T
SSSSSSS
AAAAAAA
6543210
RRRRRRRR
AAAAAAAA
76543210
SSSSSSS
AAAAAAA
6543210
RRRRRRRR R
DDDDDDDD D
76543210 7
A
NS
C
READ
AT
K
DATA
CO
(n+x)
KP
R RRRRRRRR
D DDDDDDDD
0 76543210
Figure 10. 2-wire serial bus protocol
Scan Rate
After scan each sensor in time series, MPU convert to the switch operations from the detected results.
One scan rate is about 14.8msec at typical.
SIN0
SIN1
SIN2
SIN3
SIN4
Data update
Scan rate = 14.8msec (OSC = 50MHz)
Figure 11. Timing chart of scan rate
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TSZ22111・15・001
18/29
TSZ02201-0L5L0F300830-1-2
14.Jul.2016 Rev.002