X9241A Datasheet, PDF (6/18 Pages) Xicor Inc. – Quad Digitally Controlled Potentiometer (XDCP)

X9241A
Figure 6. Increment/Decrement Timing Limits
INC/DEC
CMD
ISSUED
SCL
SDA
V_W/R_W
Voltage Out
t_CLWV
Table 1. Instruction Set
Instruction
Read WCR
I₃ I₂
10
Write WCR
10
Read Data
Register
Write Data
Register
XFR Data
Register to
WCR
XFR WCR to
Data Register
10
11
11
11
Global XFR
00
Data Register to
WCR
Global XFR
WCR to Data
Register
10
Increment/
Decrement
Wiper
00
Instruction Format
I₁ I₀
P₁
P₀
R₁
0
1 1/0⁽¹⁰⁾ 1/0 X⁽¹¹⁾
1 0 1/0 1/0 X
1 1 1/0 1/0 1/0
0 0 1/0 1/0 1/0
0 1 1/0 1/0 1/0
1 0 1/0 1/0 1/0
01 X
X
1/0
00 X
X
1/0
1 0 1/0 1/0 X
R₀
Operation
X Read the contents of the Wiper Counter
Register pointed to by P₁–P₀
X Write new value to the Wiper Counter
Register pointed to by P₁–P₀
1/0 Read the contents of the Register
pointed to by P₁–P₀ and R₁–R₀
1/0 Write new value to the Register pointed
to by P₁–P₀ and R₁–R₀
1/0 Transfer the contents of the Register
pointed to by P₁–P₀ and R₁–R₀ to its
associated WCR
1/0 Transfer the contents of the WCR
pointed to by P₁–P₀ to the Register
pointed to by R₁–R₀
1/0 Transfer the contents of the Data
Registers pointed to by R₁–R₀ of all four
pots to their respective WCR
1/0 Transfer the contents of all WCRs to their
respective data Registers pointed to by
R₁–R₀ of all four pots
X Enable Increment/decrement of the
WCR pointed to by P₁–P₀
Notes: (10) 1/0 = data is one or zero
(11) X = Not applicable or don’t care; that is, a data register is not involved in the operation and need not be addressed (typical)
REV 1.1.13 12/09/02
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Characteristics subject to change without notice. 6 of 18