BU21072MUV_16 Datasheet, PDF (20/40 Pages) Rohm – Capacitive Switch Controller ICs

BU21072MUV / BU21078MUV / BU21078FV
Byte Write
S Slave Address
W A Register Address
A Write Data
AS
T =0x5C
R C (n)
C to Register
CT
A (BU21072MUV)
IK
K (Register Address
KO
R =0x5D
T
= n)
P
T (BU21078MUV/FV)
E
SSSSSSS
R R R R R R R R WWWWWWWW
AAAAAAA
AAAAAAAA
DDDDDDDD
6543210
76543210
76543210
SA : Slave Address
RA : Register Address
RD : Read Data
WD : Write Data
Random Read
S Slave Address
W A Register Address
A S Slave Address
R A Read Data
NS
T =0x5C
R C (n)
C T =0x5C
E C from Register
AT
A (BU21072MUV)
IK
K A (BU21072MUV)
A K (Register Address
CO
R =0x5D
T
R =0x5D
D
= n)
KP
T (BU21078MUV/FV)
E
T (BU21078MUV/FV)
SSSSSSS
RRRRRRRR
SSSSSSS
RRRRRRRR
AAAAAAA
AAAAAAAA
AAAAAAA
DDDDDDDD
6543210
76543210
6543210
76543210
Sequential Read
S Slave Address
W A Register Address
A S Slave Address
R A Read Data
A
T =0x5C
R C (n)
C T =0x5C
E C from Register
C
A (BU21072MUV)
IK
K A (BU21072MUV)
A K (Register Address
K
R =0x5D
T
R =0x5D
D
= n)
T (BU21078MUV/FV) E
T (BU21078MUV/FV)
SSSSSSS
RRRRRRRR
SSSSSSS
RRRRRRRR
R
AAAAAAA
AAAAAAAA
AAAAAAA
DDDDDDDD
D
6543210
76543210
6543210
76543210
7
A Read Data
C from Register
K (Register Address
= n+x)
NS
AT
CO
KP
R
RRRRRRRR
D
DDDDDDDD
0
76543210
After scan each sensor in time series, MPU convert to the switch operations from the detected results. The number of
sensor ports is difference between BU21072MUV and BU21078MUV / BU21078FV, but one scan rate is the same. One
scan rate is about 16msec at typical.
Figure 12. 2-wire serial bus protocol
Scan Rate = 16msec (OSC=50MHz)
BU21072MUV
SIN0
SIN1
:
SIN9
:
SIN13
SIN14
Data
update
SIN13 and
SIN14 are
nonexistent on
BU21072MUV.
SIN11 and
SIN12 are the
same above.
BU21078MUV
BU21078FV
SIN0
SIN1
:
SIN9
:
SIN13
SIN14
Data
update
Figure 13. Timing chart of scan rate
SIN9 is
nonexistent on
BU21078MUV
/BU21078FV. SIN8
is the same above.
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TSZ02201-0L5L0F300640-1-2
14.Jul.2016 Rev.004