
BH2226FV,BH2226F
Technical Note
5/9
www.rohm.com
2009.07 - Rev.B
2009 ROHM Co., Ltd. All rights reserved.
●Operation Description
·Command Transmission
The Control command consists of 3 lines of 12bit serial input data (MSB first).
DI data is read at the rising edge of the CLK, and becomes valid in the CSB Low area (before the CSB rise for 12bit data).
Fig.4
Data Settings
D0
D1
D2
D3
D4
D5
D6
D7
Setting
0
At D/A setting:GND
1
0
At D/A setting:(VCC-GND)/256x1
0
1
0
At D/A setting:(VCC-GND)/256 x 2
1
0
At D/A setting:(VCC-GND)/256 x 3
0
1
0
At D/A setting:(VCC-GND)/256 x 4
~
0
1
At D/A setting:(VCC-GND)/256 x 254
1
At D/A setting:(VCC-GND)/256 x 255
(Note)
Default
D[7:0]=00h
Channel Settings
D8
D9
D10
D11
Setting
0
Power down setting (default)
0
1
DA1
0
1
0
DA2
0
1
DA3
0
1
0
DA4
0
1
0
1
DA5
0
1
0
DA6
0
1
DA7
1
0
DA8
1
0
1
Power down release
1
0
1
0
Inconsequential
1
0
1
Inconsequential
1
0
I/O D/A select
1
0
1
I/O serialParallel
1
0
I/O parallelSerial
1
I/O status setting
Input / Output D/A Selection settings :Each channel can be set for either I/O port or D/A converter output.
0: I/O mode (When I/O mode is selected, set the status as well.)
1: D/A mode (Set the I/O status to output mode.)
D0
D1
D2
D3
D4
D5
D6
D7
Description
DA1
DA2
DA3
DA4
DA5
DA6
DA7
DA8
Corresponding terminals for I/O or
D/A selection
I/O Status Setting : Set the status of the I/O input output terminal by D0 ~ D7.
0: input mode (High-Z status)
1: output mode
D0
D1
D2
D3
D4
D5
D6
D7
Description
DA1
DA2
DA3
DA4
DA5
DA6
DA7
DA8
Corresponding terminals for status
setting
D0
D1
D2
D3
D4
D5
D6
D7
D8
D9
D10
D11
X
1
2
3
4
6
7
8
10
11
12
CSB
CLK
DI
9
5