CAT5270 Datasheet, PDF (8/10 Pages) ON Semiconductor – Dual Digitally Programmable Potentiometers (DPP) with 256 Taps & I2C Compatible Interface

CAT5270
SDA
0 101
S
T
ID3I D2 ID1ID0 A3
A
R Device ID
T
A2
A1
A0
A
C
Internal
K
Address
1 0 100 0 0
I3 I2 I1 I0 F2 F1 F0 P A
C
Instruction
Opcode
K
Fixed _Pot/WCR
D7 D6 D5 D4 D3 D2 D1 D0
WCR[7:0]
AS
CT
KO
P
Figure 7. Write Instruction Sequence
SDA
0 101
1 0 010 0 0
1
S
T
ID3I D2 ID1ID0 A3
A
R Device ID
T
A2
A1
A0
A
C
Internal
K
Address
I3 I2 I1 I0 F2 F1 F0 P A
C
Instruction
Opcode
K
Fixed _Pot/WCR
D7 D6 D5 D4 D3 D2 D1 D0 A
C
Data Register D[7:0]
K
S
T
O
P
Figure 8. Read Instruction Sequence
SDA
0 101
0 0 100 0 0
S
T
ID3I D2 ID1ID0 A3
A
R Device ID
T
A2 A1 A0 A
C
Internal
K
Address
I3 I2 I1 I0 F2 F1 F0 P A
C
Instruction
K
Fixed _Pot/WCR
Opcode
I
N
C
1
I
N
C
2
ID
NE
CC
n1
No Fixed Length
Figure 9. Increment/Decrement Instruction Sequence
DS
ET
CO
nP
INC/DEC
Command
Issued
SCL
t_WRL
SDA
Voltage Out
R_W
Figure 10. Increment/Decrement Timing Limits
Instruction Format
Read Wiper Control Register (WCR)
S
DEVICE ADDRESSES
A
INSTRUCTION
A
DATA
AS
T
C
C
CT
A
K
K
KO
R ^{0 1 0 1 A3 A2 A1 A0}
1001000P
76543210
P
T
Write Wiper Control Register (WCR)
S
DEVICE ADDRESSES
A
INSTRUCTION
A
DATA
AS
T
C
C
CT
A
K
K
KO
R ^{0 1 0 1 A3 A2 A1 A0}
1010000P
76543210
P
T
Increment (I)/Decrement (D) Wiper Control Register (WCR)
S
DEVICE ADDRESSES
A
INSTRUCTION
A
DATA
S
T
C
C
T
A 0 1 0 1 A3 A2 A1 A0 K 0 0 1 0 0 0 0 P K I I . . I I O
R
/ / . / /_P
T
DD
DD
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