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參數(shù)資料
| 型號(hào)： | ISL95310WIU10Z-TK |
| 廠商： | Intersil |
| 文件頁(yè)數(shù)： | 7/8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) |
7
FN8083.0
May 6, 2005
On applying power to the ISL95310, the VCC supply should
have a monotonic ramp to the specified operating voltage. It
is important that once VCC reaches 1V that it increases to at
least 2.5V in less than 7.5ms (0.2V/ms). The ramp rate
before and after these thresholds is not important.
VCC must be applied prior to, or simultaneously, with V+.
Under no condition should V+ be applied without VCC. While
the sequence of applying V+ and VCC to the ISL95310 does
not affect the proper recall of the wiper position, applying V+
before VCC powers the electronic switches of the DCP
before the electronic switch control signals are applied. This
can result in multiple electronic switches being turned on,
which could load the power supply and cause brief,
unexpected potentiometer wiper settings.
To prevent unknown wiper positions on the ISL95310 on
power down, it is recommended that V+ turn off before or
simultaneously with VCC. If V+ remains on after VCC turns
off, the wiper position can remain unchanged from its
previous setting or it can go to an undefined state.
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 one hundred wiper positions along the resistive array.
The value of the counter is stored in nonvolatile memory
whenever CS transitions HIGH while the INC input is also
HIGH.
The system may select the ISL95310, 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.
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.
During initial power-up CS must go high along with or before
VCC to avoid an accidental store generation.
TABLE 1. MODE SELECTION
CS
INC
U/D
MODE
L
H
Wiper up
L
Wiper down
H
X
Store wiper position
H
X
Standby current
L
X
No store, return to standby
H
X
Standby
L
H
Wiper up one position
(not recommended)
L
Wiper down one position
(not recommended)
ISL95310
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