X9409 Xicor, X9409 Datasheet - Page 5

• Manufacturer Part Number: X9409
• Description: Quad Digitally Controlled Potentiometers
• Manufacturer: Xicor

Table 1. Instruction Set
Note: (7) 1/0 = data is one or zero
Figure 3. Two-Byte Instruction Sequence
The Increment/Decrement command is different from
the other commands. Once the command is issued and
the X9409 has responded with an acknowledge, the
master can clock the selected wiper up and/or down in
one segment steps; thereby, providing a fine tuning
capability to the host. For each SCL clock pulse (t
while SDA is HIGH, the selected wiper will move one
X9409 – Preliminary Information
REV 1.6 1/30/03
Read Wiper Counter
Register
Write Wiper Counter
Register
Read Data Register
Write Data Register
XFR Data Register to
Wiper Counter Register
XFR Wiper Counter
Register to Data
Register
Global XFR Data
Registers to Wiper
Counter Registers
Global XFR Wiper
Counter Registers to
Data Register
Increment/Decrement
Wiper Counter Register
Instruction
SDA
SCL
S
T
A
R
T
0
I
1
1
1
1
1
1
0
1
0
3
1
I
0
0
0
1
1
1
0
0
0
2
0
I
0
1
1
0
0
1
0
0
1
1
1
Instruction Set
A3 A2 A1 A0
I
1
0
1
0
1
0
1
0
0
0
R
R
R
R
R
R
R
0
0
0
1
1
1
1
1
1
1
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HIGH
R
R
R
R
R
R
R
0
0
0
0
0
0
0
0
0
0
)
A
C
K
P
P
P
P
P
P
P
P
0
0
1
1
1
1
1
1
1
1
resistor segment towards the V
for each SCL clock pulse while SDA is LOW, the
selected wiper will move one resistor segment towards
the V
sequence and timing for this operation are shown in
Figures 5 and 6 respectively.
I3
P
P
P
P
P
P
P
P
0
0
I2
0
0
0
0
0
0
0
0
L
/R
Read the contents of the Wiper Counter
Register pointed to by P
Write new value to the Wiper Counter Register
pointed to by P
Read the contents of the Data Register pointed
to by P
Write new value to the Data Register pointed to
by P
Transfer the contents of the Data Register
pointed to by P
Wiper Counter Register
Transfer the contents of the Wiper Counter
Register pointed to by P
Register pointed to by R
Transfer the contents of the Data Registers
pointed to by R
respective Wiper Counter Registers
Transfer the contents of both Wiper Counter
Registers to their respective Data Registers
pointed to by R
Enable Increment/decrement of the WCR Latch
pointed to by P
I1
L
terminal. A detailed illustration of the
I0
1
–P
1
–P
0
R1 R0 P1 P0
Characteristics subject to change without notice.
and R
0
and R
1
1
1
1
1
–P
1
–P
–P
–R
–R
–R
Operation
0
1
0
0
0
0
–R
and R
0
of all four pots
of all four pots to their
0
H
1
1
1
/R
–P
–P
–R
1
A
C
K
–R
H
0
0
0
terminal. Similarly,
0
to the Data
S
T
O
P
to its associated
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