
BU2508FV,BU2507FV
Technical Note
5/8
www.rohm.com
2011.08 - Rev.C
2011 ROHM Co., Ltd. All rights reserved.
●Command Sending
1) In the case of BU2507FV
(1) Data format [data : LSB first]
(2) Data timing diagram
D3
D2
D1
D0
Address selection
0
Inconsequential
0
1
Inconsequential
0
1
0
AO1 selection
0
1
AO2 selection
0
1
0
Inconsequential
0
1
0
1
AO3 selection
0
1
0
AO4 selection
0
1
Inconsequential
1
0
AO5 selection
1
0
1
AO6 selection
1
0
1
0
Inconsequential
1
0
1
Inconsequential
1
0
Inconsequential
1
0
1
Inconsequential
1
0
Inconsequential
1
Inconsequential
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D/A output (VrefH=VDD, VrefL=VSS)
0
VrefL
0
1
(VrefH-VrefL)/1024×1+VrefL
0
1
0
(VrefH-VrefL)/1024×2+VrefL
0
1
(VrefH-VrefL)/1024×3+VrefL
:
:
1
0
(VrefH-VrefL)/1024×1022+VrefL
1
(VrefH-VrefL)/1024×1023+VrefL
2) In the case of BU2508FV
(1) Data format [Data: LSB first ]
(2) Data timing diagram
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D/A output (VrefH=VDD, VrefL=VSS)
0
VrefL
0
1
(VrefH-VrefL)/1024×1+VrefL
0
1
0
(VrefH-VrefL)/1024×2+VrefL
0
1
(VrefH-VrefL)/1024×3+VrefL
:
:
1
0
(VrefH-VrefL)/1024×1022+VrefL
1
(VrefH-VrefL)/1024×1023+VrefL
D3
D2
D1
D0
Address selection
0
Don’t Care
0
1
Don’t Care
0
1
0
AO1 selection
0
1
AO2 selection
0
1
0
Don’t Care
0
1
0
1
Don’t Care
0
1
0
Don’t Care
0
1
Don’t Care
1
0
AO3 selection
1
0
1
AO4 selection
1
0
1
0
Don’t Care
1
0
1
Don’t Care
1
0
Don’t Care
1
0
1
Don’t Care
1
0
Don’t Care
1
Don’t Care
D0
D1
D2
D3
D13
D12
D11
DI
CLK
LD
DACOUT
D4
ADDRESS
LSB
ADDRESS
MSB
DATA
MSB
DATA
LSB
D13
D12
D11
D10
D9
D8D7
D6
D5
D4D3
D2
D1
D0
D/A converter output setting DATA
address select
D13
D12
D11
DI
CLK
LD
DACOUT
D0
D1
D2
D3
D4
ADDRESS
LSB
ADDRESS
MSB
DATA
MSB
DATA
LSB
D13
D12
D11
D10
D9
D8D7D6
D5
D4D3
D2D1D0
D/A converter output setting DATA
address select