BH6172GU_11 ROHM [Rohm], BH6172GU_11 Datasheet - Page 8

• Manufacturer Part Number: BH6172GU_11
• Description: System Regulator with High Efficiency DC/DC Converters
• Manufacturer: ROHM [Rohm]

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© 2011 ROHM Co., Ltd. All rights reserved.
BH6172GU
www.rohm.com
2
C Bus Interface
The I
This protocol uses a two-wire interface for bi-directional communications between the LSI’s connected to the bus.
The two interface lines are the Serial Data Line (DATA), and the Serial Clock Line (CLK). These lines should be connected to
the power supply DVDD by a pull-up resistor, and remain high even when the bus is idle.
1. Start and Stop Conditions
2. Data transmission
3. Device addressing
When CLK is high, pulling DATA low produces a start condition and pulling DATA high produces a stop condition.
Every instruction is started when a start condition occurs and terminated when a stop condition occurs. During read, a stop
condition causes the read to terminate and the chip enters the standby state. During write, a stop condition causes the
fetching of write data to terminate, after which writing starts automatically. Upon the completion of writing, the chip enters
the standby state. Two or more start conditions cannot be entered consecutively.
Data on the DATA input can be modified while CLK is low. When CLK is high, modifying the DATA input means a start or
stop condition.
All other acknowledge, write, and read timings all conform to the I
The device address for this device is “1001111”.
2
C compatible synchronous serial interface provides access to programmable functions and register on the device.
DATA
CLK
MSB
DATA
1
CLK
t
SU.STA
Start condition
0
t
HD.STA
Device address
Fig.4 I
0
Fig.3 I
Modify data
Fig.5 I
1
2
t
C Data Transmission Timing
SU.DAT
2
C Start, Stop condition
2
C device address
1
8/16
1
2
C standard.
Read/write instruction
1
t
HD.DAT
Modify data
code
R/W
LSB
t
SU.STO
Stop condition
Technical Note
2011.03 - Rev.A