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X9319WS8Z

P1-P3P4-P6P7-P8
4
FN8185.3
July 31, 2014
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Power-Up and Down Requirements
In order to prevent unwanted tap position changes, or an
inadvertent store, bring the CS
and INC high before or
concurrently with the V
CC
pin on power-up. The potentiometer
voltages must be applied after this sequence is completed.
During power-up, the data sheet parameters for the DCP do
not fully apply until 1 millisecond after V
CC
reaches its final
value. The V
CC
ramp spec is always in effect.
Test Circuit Equivalent Circuit
FORCE
CURRENT
TEST POINT
R
W
C
H
C
L
R
W
10pF
10pF
R
TOTAL
C
W
25pF
R
H
R
L
AC Conditions of Test
Input pulse levels 0.8V to 2V
Input rise and fall times 10ns
Input reference levels 1.4V
A.C. Operating Characteristics V
CC
= 5V ±10%. Boldface limits apply across the operating temperature range, -40°C to +85°C
(Industrial) and 0°C to +70°C (Commercial).
SYMBOL PARAMETER
MIN
(Note 7
)
TYP
(Note 8)
MAX
(Note 7)UNIT
t
Cl
CS to INC setup 100 ns
t
lD
(Note 9)INC HIGH to U/D change 100 ns
t
DI
(Note 9)U/D to INC setup 1 µs
t
lL
INC LOW period 1 µs
t
lH
INC HIGH period 1 µs
t
lC
INC inactive to CS inactive 1 µs
t
CPHS
CS deselect time (STORE) 20 ms
t
CPHNS
(Note 9
)
CS
deselect time (NO STORE) 1 µs
t
IW
(Note 9)INC to R
W
change 100 500 µs
t
CYC
INC cycle time 4 µs
t
R,
t
F
(Note 9
)
INC
input rise and fall time 500 µs
t
PU
(Note 9) Power-up to wiper stable 500 µs
t
R
V
CC
(Note 9
)
V
CC
power-up rate 0.2 50 V/ms
NOTES:
4. Absolute linearity is utilized to determine actual wiper voltage versus expected voltage = [V(R
W(n)(actual)
) - V(R
W(n)(expected)
)]/MI
V(R
W(n)(expected)
) = n(V(R
H
) - V(R
L
))/99 + V(R
L
), with n from 0 to 99.
5. Relative linearity is a measure of the error in step size between taps = [V(R
W(n+1)
) - (V(R
W(n)
) - MI)]/MI.
6. 1 Ml = Minimum Increment = [V(R
H
) - V(R
L
)]/99.
7. Parameters with MIN and/or MAX limits are 100% tested at +25°C, unless otherwise specified. Temperature limits established by characterization
and are not production tested.
8. Typical values are for T
A
= +25°C and nominal supply voltage.
9. Guaranteed by device characterization.
10. Ratiometric temperature coefficient = (V(R
W
)
T1(n)
- V(R
W
)
T2(n)
)/[V(R
W
)
T1(n)
(T1 - T2) x 10
6
], with T1 and T2 being 2 temperatures, and n from
0 to 99.
11. Measured with wiper at tap position 31, R
L
grounded, using test circuit.
X9319
5
FN8185.3
July 31, 2014
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A.C. Timing
Pin Descriptions
R
H
and R
L
The high (R
H
) and low (R
L
) terminals of the X9319 are
equivalent to the fixed terminals of a mechanical
potentiometer. The terminology of R
L
and R
H
references the
relative position of the terminal in relation to wiper movement
direction selected by the U/D
input and not the voltage
potential on the terminal.
R
W
R
W
is the wiper terminal and is equivalent to the movable
terminal of a mechanical potentiometer. The position of the
wiper within the array is determined by the control inputs. The
wiper terminal series resistance is typically 40Ω.
Up/Down (U/D)
The U/D input controls the direction of the wiper movement
and whether the counter is incremented or decremented.
Increment (INC)
The INC input is negative-edge triggered. Toggling INC will
move the wiper and either increment or decrement the counter
in the direction indicated by the logic level on the U/D
input.
Chip Select (CS)
The device is selected when the CS input is LOW. The current
counter value is stored in nonvolatile memory when CS
is
returned HIGH while the INC
input is also HIGH. After the store
operation is complete the X9319 will be placed in the low
power standby mode until the device is selected once again.
Principles of Operation
There are three sections of the X9319: the control section, the
nonvolatile memory, and the resistor array. The control section
operates just like an up/down counter. The output of this
counter is decoded to turn on a single electronic switch
connecting a point on the resistor array to the wiper output.
The contents of the counter can be stored in nonvolatile
memory and retained for future use. The resistor array is
comprised of 99 individual resistors connected in series.
Electronic switches at either end of the array and between
each resistor provide an electrical connection to the wiper pin,
R
W
.
The wiper acts like its mechanical equivalent and does not
move beyond the first or last position. That is, the counter does
not wrap around when clocked to either extreme.
The electronic switches on the device operate in a
“make-before-break” mode when the wiper changes tap
positions. If the wiper is moved several positions, multiple taps
are connected to the wiper for t
IW
(INC to V
W
change). The
R
TOTAL
value for the device can temporarily be reduced by a
significant amount if the wiper is moved several positions.
When the device is powered down, the last wiper position
stored will be maintained in the nonvolatile memory. When
power is restored, the contents of the memory are recalled and
the wiper is set to the value last stored.
Instructions and Programming
The INC, U/D and CS inputs control the movement of the wiper
along the resistor array. With CS
set LOW, the device is
selected and enabled to respond to the U/D
and INC inputs.
HIGH-to-LOW transitions on INC
will increment or decrement
(depending on the state of the U/D
input) the seven bit counter.
The output of this counter is decoded to select one of one
hundred wiper positions along the resistive array.
The value of the counter is stored in nonvolatile memory
whenever CS
transitions HIGH while the INC input is also
HIGH.
The system may select the X9319, move the wiper and
deselect the device without having to store the latest wiper
position in nonvolatile memory. After the wiper movement is
CS
INC
U/D
R
W
t
CI
t
IL
t
IH
t
CYC
t
ID
t
DI
t
IW
MI
(3)
t
IC
t
CPHS
t
F
t
R
10%
90% 90%
t
CPHNS
X9319
6
FN8185.3
July 31, 2014
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performed as described above and once the new position is
reached, the system must keep INC
LOW while taking CS
HIGH. The new wiper position will be maintained until changed
by the system or until a power-up/down cycle recalled the
previously stored data. This procedure allows the system to
always power-up to a preset value stored in nonvolatile
memory; then during system operation minor adjustments
could be made. The adjustments might be based on user
preference, system parameter changes due to temperature
drift, etc.
The state of U/D
may be changed while CS remains LOW. This
allows the host system to enable the device and then move the
wiper up and down until the proper trim is attained.
Applications Information
Electronic digitally controlled (XDCP) potentiometers provide
three powerful application advantages:
1. The variability and reliability of a solid-state potentiometer
2. The flexibility of computer-based digital controls
3. The retentivity of nonvolatile memory used for the storage
of multiple potentiometer settings or data.
Mode Selection
CS INC U/D MODE
L H Wiper up
L L Wiper down
H X Store wiper position to
nonvolatile memory
H X X Standby
L X No store, return to standby
L H Wiper Up (not recommended)
L L Wiper Down
(not recommended)
Mode Selection (Continued)
CS
INC U/D MODE
Basic Configurations of Electronic Potentiometers
FIGURE 1. THREE TERMINAL POTENTIOMETER; VARIABLE
VOLTAGE DIVIDER
FIGURE 2. TWO TERMINAL VARIABLE RESISTOR; VARIABLE
CURRENT
V
REF
R
W
R
H
R
L
V
REF
I
Basic Circuits
FIGURE 3. BUFFERED REFERENCE VOLTAGE FIGURE 4. CASCADING TECHNIQUES FIGURE 5. SINGLE SUPPLY
INVERTING AMPLIFIER
-
+
+5V
R
1
+V
V
REF
V
OUT
LMC7101
V
OUT
= V
W
/R
W
R
W
+
-
R
1
V
O
LMC7101
R
2
+8V
100k
100k
+10V
V
S
V
O
= (R
2
/R
1
)V
S
X9319
P1-P3P4-P6P7-P8

X9319WS8Z

Mfr. #:
Buy X9319WS8Z
Manufacturer:
Renesas / Intersil
Description:
Digital Potentiometer ICs 100-TAP 10KOHMUP/DWN N/V 5V DCP-8
Lifecycle:
New from this manufacturer.
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