BU21072MUV Datasheet, PDF (6/17 Pages) Rohm – Capacitive Switch Controller ICs

BU21072MUV / BU21078MUV
Datasheet
●Timing Charts
●Host interface
2-wire serial bus.
Compatible with I2C protocol.
Supports slave mode only.
Slave Address = 0x5C (BU21072MUV)
Slave Address = 0x5D (BU21078MUV)
Supports Standard-mode (data transfer rate of 100 kbit/s) and Fast-mode (data transfer rate of 400 kbit/s).
Supports sequential read.
SDA
SDA
SCL
SCL
ST^SA^TR^ART^T Ad^Ad^ddr^re^ess^ss R^R//^WW A^ACC^KK
D_Dat_aa _ta
A^AC^CKK
Fig.8 2-wire serial bus data format
D_Da_ata_ta
N^AA^CC^K K
/ ACK
S_STO_TP_OP
Fig.9 2-wire serial bus timing chart
Parameter
Hold time (repeated) START condition
LOW period of the SCL clock
HIGH period of the SCL clock
Data hold time
Data set-up time
Set-up time for a repeated START condition
Set-up time for STOP condition
Bus free time between a STOP and START condition
Hold time (repeated) START condition
Symbol
fSCL
tHD;STA
tLOW
tHIGH
tHD;DAT
tSU;DAT
tSU;STA
tSU;STO
tBUF
Standard-mode
MIN MAX
0
100
4.0
-
4.7
-
4.0
-
0.1
3.45
0.25
-
4.7
-
4.0
-
4.7
-
Fast-mode
MIN MAX
0
400
0.6
-
1.3
-
0.6
-
0.1
0.9
0.1
-
0.6
-
0.6
-
1.3
-
Unit
kHz
usec
usec
usec
usec
usec
usec
usec
usec
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TSZ22111・15・001
6/14
TSZ02201-0Y2Y0FZ00020-1-2
12.Mar.2012 Rev.001