X9119 Datasheet, PDF (9/18 Pages) Xilinx, Inc – Single Digitally-Controlled (XDCP ™ ) Potentiometer

X9119
Figure 4. Four-Byte Instruction Sequence (Write or Read for WCR or Data Registers)
SCL
SDA
0 101
0
0 X X 0 0 X X XX XX
S ^{ID3 ID2 ID1 ID0 A2 A1 A0 R/W} A ^{I2 I1 I0 0 RB RA 0}
A
T
C
C
A
R
Device ID
T
Internal
Address
K _Instruction
Opcode
Register
Address
K
WW ^A W W WWW W W WA S
CC C C C CCC C C CC T
RR K R R RRR R R RK O
98
7 6 543 2 1 0
P
Wiper or Data
Position
INSTRUCTION FORMAT
Read Wiper Counter Register (WCR)
Device Type
S _Identifier
T
Device
Addresses
A
R _{0 1 0 1 A2 A1 A0}
T
Instruction Register
Wiper Position
Wiper Position
S ^{Opcode Addresses} S ^{(Sent by Slave on SDA)} M ^{(Sent by Slave on SDA)} M S
A
C
K
1
0
0
0
0
0
0
0
A
C
K
X
X
X
X
X
X
W
C
R
W
C
R
A
C
K
W
C
R
W
C
R
W
C
R
W
C
R
W
C
R
W
C
R
W
C
R
W
C
R
A
C
K
T
O
P
98
76543210
Write Wiper Counter Register (WCR)
Device Type
Device
S _Identifier
Addresses
T
A
R
T
0
1
0
1
A2 A1 A0
Instruction Register
Wiper Position
Wiper Position
S ^Opcode
Addresses _S (Sent by Master on SDA) _S (Sent by Master on SDA) _{S S}
A
C
K
1
0
1
0
0
0
0
0
A
C
K
X
X
X
X
X
X
W
C
R
W
C
R
A
C
K
W
C
R
W
C
R
W
C
R
W
C
R
W
C
R
W
C
R
W
C
R
W
C
R
A
C
K
T
O
P
98
76543210
Read Data Register (DR)
Device Type
Device
S _Identifier
Addresses
T
A
R
T
0
1
0
1 A2 A1 A0
Instruction
Register
Wiper Position
wiper position or data
S ^Opcode
Addresses _S (Sent by Slave on SDA) _M (Sent by Slave on SDA) _{M S}
A
C
K
1
0
1
0 RB RA 0
0
A
C
K
X
X
X
X
X
X
W
C
R
W
C
R
A
C
K
WW
CC
RR
WW
CC
RR
WW
CC
RR
WW
CC
RR
A
C
K
T
O
P
98
76543210
9
FN8162.2
September 15, 2005