X9313
TABLE 1. PIN NAMES
DESCRIPTION
The system may select the X9313, 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 power-up/down cycle
recalled the previously stored data.
SYMBOL
RH/VH
RW/VW
RL/VL
VSS
High terminal
Wiper terminal
Low terminal
Ground
VCC
Supply voltage
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.
U/D
Up/Down control input
Increment control input
Chip Select control input
INC
CS
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.
Principles of Operation
There are three sections of the X9313: the input control,
counter and decode section; the nonvolatile memory; and
the resistor array. The input 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. Under the proper
conditions the contents of the counter can be stored in
nonvolatile memory and retained for future use. The resistor
array is comprised of 31 individual resistors connected in
series. At either end of the array and between each resistor
is an electronic switch that transfers the potential at that
point to the wiper.
TABLE 2. MODE SELECTION
CS
INC
U/D
MODE
L
H
Wiper up
L
L
Wiper down
H
X
Store wiper position
H
X
L
X
X
Standby current
No store, return to standby
L
L
H
L
Wiper up (not recommended)
Wiper down (not recommended)
The wiper, when at either fixed terminal, acts like its
mechanical equivalent and does not move beyond the last
position. That is, the counter does not wrap around when
clocked to either extreme.
Symbol Table
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 (INC to V change). The
WAVEFORM
INPUTS
OUTPUTS
Must be
steady
Will be
steady
IW
W
R
value for the device can temporarily be reduced by
TOTAL
a significant amount if the wiper is moved several positions.
May change
from Low to
High
Will change
from Low to
High
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.
May change
from High to
Low
Will change
from High to
Low
Don’t Care:
Changes
Allowed
Changing:
State Not
Known
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 seven
bit counter. The output of this counter is decoded to select
one of thirty-two wiper positions along the resistive array.
N/A
Center Line
is High
Impedance
The value of the counter is stored in nonvolatile memory
whenever CS transitions HIGH while the INC input is also
HIGH.
FN8177.5
April 18, 2007
4
INTERSIL [ Intersil ]
