CAT5409_13 Datasheet, PDF (11/15 Pages) ON Semiconductor – Quad Digital Potentiometer (POT)

CAT5409
SDA
010 1
S ^{ID3 ID2 ID1 ID0} A3 A2 A1 A0
T
A
R Device ID
T
Internal
Address
A
C
K
I3
I2
I1
I0 R1 R0 P1 P0
A
C
K
Instruction
Opcode
Register Pot/WCR
Address Address
S
T
O
P
Figure 10. Two-byte Instruction Sequence
SDA
0 101
S
T
A
R
T
ID3 ID2 ID1 ID0 A3 A2 A1 A0
Device ID
Internal
Address
A
C
K
I3 I2 I1 I0 R1 R0 P1 P0 A D7 D6 D5 D4 D3 D2 D1 D0 A S
C
CT
K
Instruction
Opcode
Data Pot/WCR
Register ^Address
WCR[7:0]
or
Data Register D[7:0]
KO
P
Address
Figure 11. Three-byte Instruction Sequence
SDA
0101
S ^{ID3 ID2 ID1 ID0 A3 A2 A1 A0} A ^{I3 I2 I1 I0 R1 R0 P1 P0} A I I
T
A
Device ID
Internal
C
K Instruction
CN N
Data ^{Pot/WCR K C C}
R
T
Address
Opcode
Register ^Address
Address
12
Figure 12. Increment/Decrement Instruction Sequence
ID
NE
CC
n1
DS
ET
CO
nP
INC/DEC
Command
Issued
SCL
SDA
t_WRID
Voltage Out
R_W
Figure 13. Increment/Decrement Timing Limits
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