X93256_08 Datasheet, PDF (2/7 Pages) Intersil Corporation – Dual Digitally Controlled Potentiometers(XDCPs™)

X93256
Block Diagram
GENERAL DESCRIPTION
V_CC (SUPPLY VOLTAGE)
30k
UP/DOWN
(U/D₁ AND U/D₂)
INCREMENT
(INC₁ AND INC₂)
DEVICE SELECT
(CS₁ AND CS₂)
CONTROL
AND
MEMORY
R_H1
R_W1
R_L1
R_H2
R_W2
R_L2
V_SS (GROUND)
U/D₁
INC₁
CS₁
V_CC
V_SS
DETAILED SINGLE POTENTIOMETER DESCRIPTION
5-BIT
UP/DOWN
COUNTER
5-BIT
NONVOLATILE
MEMORY
STORE AND
CONTROL
RECALL
CIRCUITRY
31
30
29
28
ONE
OF
THIRTY
TWO
DECODER
2
1
0
R_H1
R_W
TRANSFER RESISTOR
GATES
ARRAY
R_L1
Pin Descriptions
TSSOP
1
2
3
4
5
6
7
8
9
10
11
12
13
14
SYMBOL
R_W1
R_L1
CS₁
INC₂
U/D₂
R_H2
V_SS
R_W2
R_L2
CS₂
V_CC
INC₁
U/D₁
R_H1
BRIEF DESCRIPTION
R_W1. The R_W1 pin of the X93256 is the wiper terminal of the first potentiometer, which is equivalent to the movable
terminal of a mechanical potentiometer.
R_L1. The R_H1 and R_L1 pins of the X93256 are equivalent to the fixed terminals of a mechanical potentiometer. The
minimum voltage is V_SS and the maximum is V_CC. The terminology of R_H1 and R_L1 references the relative position of
the terminal in relation to wiper movement direction selected by the U/D input.
Chip Select 1 (CS₁). The first potentiometer is selected when the CS₁ input is LOW. The current counter value is stored
in nonvolatile memory when CS₁ is returned HIGH while the INC₁ input is also HIGH. After the store operation is
complete, the first potentiometer of the X93256 will be placed in the low power standby mode until the first potentiometer
is selected once again.
Increment 2 (INC₂). The INC₂ input is negative-edge triggered. Toggling INC₂ will move the wiper of the second
potentiometer and either increment or decrement the counter in the direction indicated by the logic level on the U/D₂
input.
Up/Down 2 (U/D₂). The U/D₂ input controls the direction of the second potentiometer wiper movement and whether the
counter for the second potentiometer is incremented or decremented.
R_H2. The R_H2 and R_L2 pins of the X93256 are equivalent to the fixed terminals of a mechanical potentiometer. The
minimum voltage is V_SS and the maximum is V_CC. The terminology of R_H2 and R_L2 references the relative position of
the wiper terminal for the second potentiometer in relation to the wiper movement direction selected by the U/D₂ input.
Ground.
R_W2. The R_W2 pin of the X93256 is the wiper terminal of the second potentiometer, which is equivalent to the movable
terminal of a mechanical potentiometer.
R_L2. The R_H2 and R_L2 pins of the X93256 are equivalent to the fixed terminals of a mechanical potentiometer. The
minimum voltage is V_SS and the maximum is V_CC. The terminology of R_H2 and R_L2 references the relative position of
the wiper terminal for the second potentiometer in relation to the wiper movement direction selected by the U/D₂ input.
Chip Select 2 (CS₂). The second potentiometer is selected when the CS₂ input is LOW. The current counter value is
stored in nonvolatile memory when CS₂ is returned HIGH while the INC₂ input is also HIGH. After the store operation is
complete, the second potentiometer of the X93256 will be placed in the low power standby mode until the second
potentiometer is selected once again.
Supply Voltage.
Increment 1(INC₁). The INC₁ input is negative-edge triggered. Toggling INC₁ will move the wiper of the first
potentiometer and either increment or decrement the counter in the direction indicated by the logic level on the U/D₁
input.
Up/Down 1 (U/D₁). The U/D₁ input controls the direction of the first potentiometer wiper movement and whether the
counter for the first potentiometer is incremented or decremented.
R_H1. The R_H1 and R_L1 pins of the X93256 are equivalent to the fixed terminals of a mechanical potentiometer. The
minimum voltage is V_SS and the maximum is V_CC. The terminology of R_H1 and R_L1 references the relative position of
the wiper terminal for the first potentiometer in relation to the wiper movement direction selected by the U/D₁ input.
2
FN8188.2
February 1, 2008