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參數(shù)資料
| 型號(hào)： | ISL95310WIU10Z-TK |
| 廠商： | Intersil |
| 文件頁(yè)數(shù)： | 6/8頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC XDCP 128-TAP 10KOHM 10-MSOP |
| 產(chǎn)品培訓(xùn)模塊： | Digitally Controlled Potentiometers |
| 標(biāo)準(zhǔn)包裝： | 1,000 |
| 系列： | XDCP™ |
| 接片： | 128 |
| 電阻（歐姆）： | 10k |
| 電路數(shù)： | 1 |
| 溫度系數(shù)： | 標(biāo)準(zhǔn)值 ±45 ppm/°C |
| 存儲(chǔ)器類型： | 非易失 |
| 接口： | 3 線串行（芯片選擇，遞增，增/減） |
| 電源電壓： | 2.7 V ~ 5.5 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 10-TFSOP，10-MSOP（0.118"，3.00mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 10-MSOP |
| 包裝： | 帶卷 (TR) |
6
FN8083.0
May 6, 2005
A.C. Timing
Power Up and Down Requirements
In order to prevent unwanted tap position changes, or an
inadvertent store, bring the CS and INC high before or
concurrently with the VCC pin on power-up. The
potentiometer voltages must be applied after this sequence
is completed. During power-up, the data sheet parameters
for the DCP do not fully apply until 1ms after VCC reaches its
final value. The VCC ramp spec is always in effect.
Pin Descriptions
RH and RL
The high (RH) and low (RL) terminals of the ISL95310 are
equivalent to the fixed terminals of a mechanical
potentiometer. The terminology of RL and RH 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
RW 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.
Up/Down (U/D)
The U/D input controls the direction of the wiper movement
and whether the counter is 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 ISL95310 will be placed
in the low power standby mode until the device is selected
once again.
Principles of Operation
There are three sections of the ISL95310: 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 127 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 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.
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 significant 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.
CS
INC
U/D
RW
tCI
tIL
tIH
tCYC
tID
tDI
tIW
MI
(3)
tIC
tCPHS
tF
tR
10%
90%
tCPHNS
ISL95310
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