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X9313ZMI 参数 Datasheet PDF下载

X9313ZMI图片预览
型号: X9313ZMI
PDF下载: 下载PDF文件 查看货源
内容描述: E2POT⑩非易失性数字电位计 [E2POT⑩ Nonvolatile Digital Potentiometer]
分类和应用: 数字电位计
文件页数/大小: 10 页 / 53 K
品牌: XICOR [ XICOR INC. ]
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X9313  
DEVICE OPERATION  
Operation Notes  
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.  
The system may select the X9313, move the wiper and  
deselect the device without having to store the latest  
wiper position in nonvolatile memory. The wiper move-  
ment is performed as described above; once the new  
position is reached, the system would the keep INC  
LOW while taking CS HIGH. The new wiper position  
would be maintained until changed by the system or  
until a power-up/down cycle recalled the previously  
stored data.  
This would allow 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...  
TheINC,U/DandCS inputscontrolthemovementofthe  
wiper along the resistor array. With CS set LOW the  
X9313 is selected and enabled to respond to the  
U/DandINC inputs.HIGHtoLOWtransitionsonINC will  
increment or decrement (depending on the state of the  
U/D input)asevenbitcounter. Theoutputofthiscounter  
is decoded to select one of thirty two wiper positions  
along the resistive array.  
The state of U/D may be changed while CS remains  
LOW. This allows the host system to enable the X9313  
and then move the wiper up and down until the proper  
trim is attained.  
T
/R  
IW TOTAL  
The electronic switches on the X9313 operate in a  
“make before break” mode when the wiper changes tap  
positions. If the wiper is moved several positions mul-  
tiple taps are connected to the wiper for t (INC to V  
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.  
IW  
W
change). The R  
rarily be reduced by a significant amount if the wiper is  
moved several positions.  
value for the device can tempo-  
TOTAL  
The value of the counter is stored in nonvolatile memory  
whenever CS transistions HIGH while the INC input is  
also HIGH.  
R
with V Removed  
CC  
TOTAL  
When the X9313 is powered-down, the last counter  
position stored will be maintained in the nonvolatile  
memory. When power is restored, the contents of the  
memoryarerecalledandthecounterisresettothevalue  
last stored.  
Theendtoendresistanceofthearraywillfluctuateonce  
is removed.  
V
CC  
SYMBOL TABLE  
WAVEFORM  
INPUTS  
OUTPUTS  
Must be  
steady  
Will be  
steady  
May change  
from LOW  
to HIGH  
Will change  
from LOW  
to HIGH  
May change  
from HIGH  
to LOW  
Will change  
from HIGH  
to LOW  
Don’t Care:  
Changes  
Allowed  
Changing:  
State Not  
Known  
N/A  
Center Line  
is High  
Impedance  
3