X9317 Datasheet, PDF (10/15 Pages) Intersil Corporation – Low Noise, Low Power, 100 Taps

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 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 powerup/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.
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)
10
FN8183.1
September 9, 2005