X9315_09 Datasheet, PDF (5/16 Pages) Intersil Corporation – Digitally Controlled Potentiometer (XDCP™)

X9315
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.
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)
Power-up and Down Requirements
There are no restrictions on the power-up or power-down
conditions of V_CC and the voltages applied to the
potentiometer pins provided that V_CC is always more
positive than or equal to V_H, V_L, and V_W, i.e., V_CC ≥ V_H, V_L,
V_W. The V_CC ramp rate spec is always in effect.
5
FN8179.2
December 21, 2009