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參數(shù)資料
| 型號： | DS1809 |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 模擬信號調(diào)理 |
| 英文描述： | Nonvolatile Digitally Controlled Potentiometer(非易失性數(shù)字電位器) |
| 中文描述： | SPECIALTY ANALOG CIRCUIT, PDIP8 |
| 封裝： | DIP-8 |
| 文件頁數(shù)： | 2/5頁 |
| 文件大?。?/td> | 46K |
| 代理商： | DS1809 |
DS1809
061798 2/5
BLOCK DIAGRAM
Figure 1
NV MEMORY
CONTROL
LOGIC
R
H
R
L
STR
R
W
UC
DC
OPERATION
The DS1809 Dallastat is a digitally controlled nonvola-
tile potentiometer. A block diagram of the DS1809 is
shown in Figure 1. The DS1809 is a linear potentiome-
ter providing 64–uniform wiper positions over the entire
resistor range including the end–terminals. All three
potentiometer terminals of the device are accessible.
These terminals include R
H
, R
L
, and R
W
. R
H
and R
L
are
the end–terminals of the potentiometer. These termi-
nals will have a constant resistance between them as
defined by the potentiometer value chosen: 10K
,
50K
, or the 100K
version. Functionally, R
H
and R
L
are interchangeable. The wiper terminal, R
W
, is the mul-
tiplexed terminal and can be set to one of the 64 total
positions that exist on the resistor ladder including the
R
H
and R
L
terminals.
Control of the wiper (R
W
) position setting is accom-
plished via the two inputs UC and DC. The UC and DC
control inputs, when active, determine the direction on
the resistor array that the wiper position will move. The
UC (up control) control input is used to move the wiper
position towards the R
H
terminal. The DC (down con-
trol) control input is used to move wiper position towards
the R
L
terminal.
The control inputs UC and DC are active low inputs
which interpret input pulse widths as the means of con-
trolling wiper movement. Internally, these inputs are
pulled–up to V
CC
via a 100K
resistance. A transition
from a high–to–low on these inputs is considered the
beginning of pulse input activity.
A single pulse on the UC or DC input is defined as being
greater than 1 millisecond but lasting no longer that 1/2
second. This type pulse input will cause the wiper posi-
tion of the Dallastat to move one position.
Multiple pulse inputs (repetitive pulse inputs) can be
used to step through each wiper position of the device.
The requirement for a repetitive pulse train on the UC or
DC inputs is that pulses must be separated by a mini-
mum high time of 1 millisecond. If this is not the case the
Dallastat will ignore that pulse input.
A continuous pulse input (“push and hold”) is defined as
lasting longer that 1/2 second. A continuous pulse input
will cause the wiper position to move one position every
100 milliseconds following the initial 1/2 second hold
time. The total time to transcend the entire potentiome-
ter given a continuous pulse input is provided by the
equation:
1/2(second) + 62 X 100 ms = 6.7 (seconds)
If the wiper position of the DS1809 is incremented to an
end–position, it will stay at that position until the device
receives an opposite direction input pulse command
over the UC or DC inputs. For example, if the wiper
position is incremented to the R
H
terminal using the UC
input control, it will stay at that position until UC is first
deactivated, and then the DC input is activated to move
the wiper position towards the R
L
terminal.
The UC and DC control inputs are designed to support
simple push–button inputs or CPU generated inputs.
Figure 2 illustrates the requirements for push–button
generated controls. For manual push–button controls
all that is required are the desired push–buttons to
implement contact closure. No external debounce or
timing circuitry is needed to support the push–button
operation.
Applications using CPU generated controls must power
the UC and DC control pins in a high–state to avoid any
inadvertent wiper position movement. To help prevent
inadvertent wiper position movement during a pow-
er–up, the DS1809 locks out the control port inputs for a
minimum time of 10 ms.
WIPER STORAGE
As stated earlier, the DS1809 provides for two methods
of nonvolatile wiper storage using internal EEPROM
memory cells. These two methods include an autostore
configuration and a command initiated storage opera-
tion both of which utilize the STR input pin. The
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參數(shù)描述 |
|---|---|
| DS1809-010 | 功能描述:數(shù)字電位計 IC RoHS:否 制造商:Maxim Integrated 電阻:200 Ohms 溫度系數(shù):35 PPM / C 容差:25 % POT 數(shù)量:Dual 每 POT 分接頭:256 弧刷存儲器:Volatile 緩沖刷: 數(shù)字接口:Serial (3-Wire, SPI) 描述/功能:Dual Volatile Low Voltage Linear Taper Digital Potentiometer 工作電源電壓:1.7 V to 5.5 V 電源電流:27 uA 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:TQFN-16 封裝:Reel |
| DS1809-010+ | 功能描述:數(shù)字電位計 IC Dallastat RoHS:否 制造商:Maxim Integrated 電阻:200 Ohms 溫度系數(shù):35 PPM / C 容差:25 % POT 數(shù)量:Dual 每 POT 分接頭:256 弧刷存儲器:Volatile 緩沖刷: 數(shù)字接口:Serial (3-Wire, SPI) 描述/功能:Dual Volatile Low Voltage Linear Taper Digital Potentiometer 工作電源電壓:1.7 V to 5.5 V 電源電流:27 uA 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:TQFN-16 封裝:Reel |
| DS1809-050 | 功能描述:數(shù)字電位計 IC RoHS:否 制造商:Maxim Integrated 電阻:200 Ohms 溫度系數(shù):35 PPM / C 容差:25 % POT 數(shù)量:Dual 每 POT 分接頭:256 弧刷存儲器:Volatile 緩沖刷: 數(shù)字接口:Serial (3-Wire, SPI) 描述/功能:Dual Volatile Low Voltage Linear Taper Digital Potentiometer 工作電源電壓:1.7 V to 5.5 V 電源電流:27 uA 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:TQFN-16 封裝:Reel |
| DS1809-050+ | 功能描述:數(shù)字電位計 IC Dallastat RoHS:否 制造商:Maxim Integrated 電阻:200 Ohms 溫度系數(shù):35 PPM / C 容差:25 % POT 數(shù)量:Dual 每 POT 分接頭:256 弧刷存儲器:Volatile 緩沖刷: 數(shù)字接口:Serial (3-Wire, SPI) 描述/功能:Dual Volatile Low Voltage Linear Taper Digital Potentiometer 工作電源電壓:1.7 V to 5.5 V 電源電流:27 uA 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:TQFN-16 封裝:Reel |
| DS1809-10 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Digital Potentiometer |
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