X9317_09 Datasheet, PDF (10/15 Pages) Intersil Corporation – Digitally Controlled Potentiometer (XDCP™)

X9317
The system may select the X9317, 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
recalls 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.
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)
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, and
3. the retentivity of nonvolatile memory used for the storage
of multiple potentiometer settings or data.
10
FN8183.6
December 16, 2009