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參數(shù)資料
| 型號： | DS1844 |
| 廠商： | Maxim Integrated Products, Inc. |
| 元件分類： | 數(shù)字電位計 |
| 英文描述： | Quad Digital Potentiometer(四路數(shù)字電位器) |
| 文件頁數(shù)： | 2/12頁 |
| 文件大小： | 95K |
| 代理商： | DS1844 |
DS1844
042498 2/12
The DS1844 is available in standard 10K
, 50K
, and
100K
versions. Mixed resistor combinations are also
available through custom setups. The DS1844 is speci-
fied to operate over the industrial temperature range:
–40
°
C to +85
°
C. Packages for the DS1844 include
20–pin DIPs, SOICs, and TSSOPs.
OPERATION
The DS1844 contains four 64–position potentiometers.
Each potentiometer is independent and has three
accessible terminals, which include H
X
, L
X
, and W
X
.
Each potentiometer is comprised of 63–individual resis-
tor elements. Between each resistor element is a tap–
point that is multiplexed to the wiper terminal, W
x
. Addi-
tionally, the wiper terminal can be multiplexed directly to
the end–terminals, H
x
and L
x
.
The DS1844 supports two interface control options.
Both options allow for the direct placement of the wiper
position on the resistor ladder. Each wiper has an
associated 6–bit register used to hold its positional
value.
The DS1844 is a volatile device and will always pow-
er–up with the wiper positions set to mid–tap (position
32–decimal). The end–terminal H
x
will have wiper posi-
tion value 63–decimal and the L
x
terminal will have
wiper position value 0–decimal. Because the DS1844 is
a 64–position device only six bits of data are necessary
to write a wiper’s value. However, communication with
the DS1844 will require using a full 8–bits, with the
remaining two bits specifying the potentiometer
selected. A discussion of proper communication proto-
col is provided under the section entitled Serial Port
Operation. A block diagram of the DS1844 is shown in
Figure 1.
SERIAL PORT OPERATION
As stated, the DS1844 can support two types of serial
interface control. This includes a 5–wire serial interface
and a 2–wire addressable interface. The type interface
supported during operation is selectable via the port
select input pin, PS. Additionally, certain pins provide
dual functionality dependent on the serial port selected.
The pin description table lists pin functionality according
to the interface selected.
5–Wire Serial Port Control
The 5–wire serial interface provides an 8–bit I/O shift
register for loading and reading wiper data. The 5–wire
serial interface control is selected when the port select
input, PS, is in a low–state. This interface is controlled
by the signals RST, DIN, DOUT, CLK, and R/W. Timing
diagrams for the 5–wire serial port can be found in Fig-
ure 3. Timing information for the 5–wire serial port is
provided in the AC Electrical Characteristics table for
5–wire serial communications.
Data is loaded MSB first and in multiples of 8–bits. The
8–bit data to specify wiper position has the format or
protocol as that shown in Figure 2. The 8–bit data is
divided into potentiometer select dataand wiper posi-
tion value The six least significant bits of data specify
the wiper position value while the two most significant
bits specify the potentiometer to be loaded. This allows
the interface control logic/protocol to provide order inde-
pendent potentiometer loading, as well as, variable–
length data loads.
As stated earlier, the 5–wire serial port is selected when
the PS input is in a low–state. If the device will only be
used in the 5–wire mode, the PS input can be tied
directly to ground. Communication via the 5–wire inter-
face is enabled when RST is in a high–state. A low–to–
high transition on the RST indicates the start of a com-
munication transaction with the DS1844. While RST is
high, data can be read or written to the part. Data will be
read or written dependent on the state of the read–write
enable input, R/W. The state of R/W must be stable
before a low–to–high transition on RST. Once the RST
input has began a communication transaction, the serial
port will ignore any transitions on the R/W input.
When writingdata, the R/W input should be in a low
state Once RST has activated the port, a data bit is
latched (or valid) on the low–to–high transition of the
CLK signal. Once, eight low–to–high transitions have
occurred on the CLK input, the associated 8–bit data
block will be loaded as the wiper’s value on the falling
edge of the 8th clock pulse. Potentiometer wiper values
can be loaded in any order. Also, potentiometer wiper
data can be loaded one, two, three, or four bytes at a
time. When RST transitions from high to low, the 5–wire
port will be disabled.
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| DS1844_05 | 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:Quad Digital Potentiometer |
| DS1844-010 | 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 |
| DS1844-010+ | 功能描述:數(shù)字電位計 IC Quad 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 |
| DS1844-050 | 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 |
| DS1844-050+ | 功能描述:數(shù)字電位計 IC Quad 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 |
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