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參數(shù)資料
| 型號： | X9315WM |
| 元件分類： | 數(shù)字電位計(jì) |
| 英文描述： | 10K DIGITAL POTENTIOMETER, INCREMENT/DECREMENT CONTROL INTERFACE, 32 POSITIONS, PDSO8 |
| 封裝： | MSOP-8 |
| 文件頁數(shù)： | 6/13頁 |
| 文件大?。?/td> | 368K |
| 代理商： | X9315WM |
X9315
Characteristics subject to change without notice.
2 of 13
REV 1.3.2 1/14/03
www.xicor.com
PIN DESCRIPTIONS
RH/VH and RL/VL
The high (RH/VH) and low (RL/VL) terminals of the
X9315 are equivalent to the xed terminals of a
mechanical potentiometer. The minimum voltage is
VSS and the maximum is VCC. The terminology of RL/
VL and RH/VH references the relative position of the
terminal in relation to wiper movement direction
selected by the U/D input, and not the voltage potential
on the terminal.
R
W
/V
W
RW/Vw is the wiper terminal and is equivalent to the
movable terminal of a mechanical potentiometer. The
position of the wiper within the array is determined by
the control inputs. The wiper terminal series resistance
is typically 200
at VCC = 5V.
Up/Down (U/D)
The U/D input controls the direction of the wiper
movement and whether the counter is incremented or
decremented.
Increment (INC)
The INC input is negative-edge triggered. Toggling
INC will move the wiper and either increment or
decrement the counter in the direction indicated by the
logic level on the U/D input.
Chip Select (CS)
The device is selected when the CS input is LOW. The
current counter value is stored in nonvolatile memory
when CS is returned HIGH while the INC input is also
HIGH. After the store operation is complete the X9315
will be placed in the low power standby mode until the
device is selected once again.
PIN CONFIGURATION
PIN NAMES
PRINCIPLES OF OPERATION
There are three sections of the X9315: 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
connection at that point to the wiper.
The wiper, when at either xed 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.
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 tIW (INC to
VW change). The RTOTAL value for the device can
temporarily be reduced by a signicant amount if the
wiper is moved several positions.
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.
VCC
CS
INC
U/D
RH/VH
VSS
1
2
3
4
8
7
6
5
X9315
DIP/SOIC/MSOP
RL/VL
RW/VW
Symbol
Description
RH/VH
High terminal
RW/VW
Wiper terminal
RL/VL
Low terminal
VSS
Ground
VCC
Supply voltage
U/D
Up/Down control input
INC
Increment control input
CS
Chip Select control input
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