BD8105FV ROHM Co. Ltd., BD8105FV Datasheet - Page 6

• Manufacturer Part Number: BD8105FV
• Description: Power Management Lsi Series For Automotive Body Control Led Driver
• Manufacturer: ROHM Co. Ltd.

●Serial Communication
The serial I/F is composed of a shift register which changes the CLK and SERIN serial signals to parallel signals, and a
register to remember those signals with a LATCH signal. The registers are reset by applying a voltage under VCC×0.2 to
the RST_B terminal or opening it, and D11~D0 become open. To prevent erroneous LED lighting, please apply voltage
under VCC×0.2 to RST_B or make it open during start-up.
1）Serial Communication Timing
2）Serial Communication Data
The 12-bit serial data input from SERIN is taken into the shift register by the rise edge of the CLK signal, and is
recorded in the register by the rise edge of the LATCH signal. The recorded data is valid until the next rise edge of the
LATCH signal.
The serial data input configuration of SERIN terminal is shown below:
First →
* represents “Don’t care”.
d11 d10 d9
Terminal
Name
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
Output
Status
CLK
SERIN
LATCH
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
d8
d11 d10 d9
d7
1
0
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
d6
Register
1
0
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
Data
Shift
d5
1
0
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
d4
d8
1
0
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
12bit
d3
d7
1
0
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
d2
d6
1
0
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
Data
6/12
Fig.13
→Last
d1
d5
1
0
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
Register
d0
d4
1
0
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
d3
1
0
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
d2
1
0
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
d1
1
0
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
12bit
d0
1
0
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
Driver