X93154UM8IZ-3T1 Intersil, X93154UM8IZ-3T1 Datasheet - Page 6

• Manufacturer Part Number: X93154UM8IZ-3T1
• Description: IC POT DGTL LP LN 50K OHM 8-MSOP
• Manufacturer: Intersil
• Series: XDCP™r

Specifications of X93154UM8IZ-3T1

• Taps: 32
• Resistance (ohms): 50K
• Number Of Circuits: 1
• Temperature Coefficient: 35 ppm/°C Typical
• Memory Type: Non-Volatile
• Interface: Up/Down (3-Wire)
• Voltage - Supply: 2.7 V ~ 3.3 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-MSOP, Micro8™, 8-uMAX, 8-uSOP,
• Resistance In Ohms: 50K
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: X93154UM8IZ-3T1TR

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) a 5-bit
counter. The output of this counter is decoded to select one
of thirty two 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. In order to avoid an accidental store during power-up,
CS must go HIGH with V
performing multiple write operations, V
by more than 150mV from its initial value. When left open,
the CS pin is internally pulled up to V
resistor.
The system may select the X93154, move the wiper and
deselect the device without having to store the latest wiper
position in nonvolatile memory. After the wiper movement is
performed as previously described 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. In order to recall the
stored position of the wiper on power-up, the CS pin must be
held HIGH.
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, or other system
trim requirements.
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.
CC
during initial power-up. When
6
CC
CC
I
by an internal 30k
must not decrease
V
R
X93154
Two terminal variable resistor.
Variable current
Mode Selection
Symbol Table
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
CS
H
L
L
of multiple potentiometer settings or data
WAVEFORM
INC
H
X
L
L
L
U/D
H
H
L
X
X
X
L
Wiper Up
Wiper Down
Store Wiper Position
Standby Current
No Store, Return to Standby
Wiper Up (not recommended)
Wiper Down (not recommended)
INPUTS
Must be
steady
May change
from Low to
High
May change
from High to
Low
Don’t Care:
Changes
Allowed
N/A
MODE
OUTPUTS
Will be
steady
Will change
from Low to
High
Will change
from High to
Low
Changing:
State Not
Known
Center Line
is High
Impedance
February 19, 2008
FN8180.3