BU21072MUV Datasheet, PDF (7/17 Pages) Rohm – Capacitive Switch Controller ICs

BU21072MUV / BU21078MUV
Datasheet
●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)
E
SSSSSSS
RRRRRRRR
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)
E
T (BU21078MUV)
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)
E
T (BU21078MUV)
SSSSSSS
RRRRRRRR
SSSSSSS
RRRRRRRR R
AAAAAAA
AAAAAAAA
AAAAAAA
DDDDDDDD D
6543210
76543210
6543210
76543210 7
Fig.10 2-wire serial bus protocol
A Read Data
C from Register
K (Register Address
= n+x)
NS
AT
CO
KP
R RRRRRRRR
D DDDDDDDD
0 76543210
●Scan rate
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, but one scan rate is the same. One scan rate is
about 16msec at typical.
BU21072MUV
BU21078MUV
SIN13 and
SIN14 are
nonexistent on
BU21072MUV.
SIN11 and
SIN12 are the
same above.
SIN9 is
nonexistent on
BU21078MUV.
SIN8 is the same
above.
www.rohm.com
© 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
Fig.11 Timing chart of scan rate
7/14
TSZ02201-0Y2Y0FZ00020-1-2
12.Mar.2012 Rev.001