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參數(shù)資料
| 型號： | DS1803 |
| 廠商： | DALLAS SEMICONDUCTOR |
| 元件分類： | 數(shù)字電位計 |
| 英文描述： | Addressable Dual Digital Potentiometer(可尋址雙路數(shù)字電位器) |
| 中文描述： | DIGITAL POTENTIOMETER, 2-WIRE SERIAL CONTROL INTERFACE, 256 POSITIONS, PDIP16 |
| 封裝： | PLASTIC, DIP-16 |
| 文件頁數(shù)： | 2/10頁 |
| 文件大?。?/td> | 74K |
| 代理商： | DS1803 |
DS1803
022698 2/10
DEVICE OPERATION
The DS1803 is an addressable, digitally controlled
device which has two 256–position potentiometers. A
functional block diagram of the part is shown in Figure 1.
Communication and control of the device is accom-
plished via a 2–wire serial interface having signals SDA
and SDL. Device addressing is attained using the
device chip select inputs A0, A1, A2 and correct com-
munication protocol over the 2–wire serial interface.
Each potentiometer is composed of a 256 position resis-
tor array. Two 8–bit registers, each assigned to a
respective potentiometer, are used to set wiper position
on the resistor array. The wiper terminal is multiplexed
to one of 256 positions on the resistor array based on its
corresponding 8–bit register value. For example, the
high–end terminals, H0 and H1, have wiper position val-
ues FF(Hex) while the low–end terminals, L0 and L1,
have wiper position values 00(Hex).
The DS1803 is a volatile device that does not maintain
the position of the wiper during power–down or loss of
power. On power–up, the DS1803 wipers’ position will
be set to position 00(Hex) –– the low–end terminals.
The user may then reset the wiper value to a desired
position.
Communication with the DS1803 takes place over the
2–wire serial interface consisting of the bi–directional
data terminal, SDA, and the serial clock input, SCL.
Complete details of the 2–wire interface are discussed
in the section entitled “2–wire Serial Bus”.
The 2–wire interface and chip select inputs A0, A1, and
A2 allow operation of up to eight devices in a bus topol-
ogy; with A0, A1, and A2 being the address of the
device.
Application Considerations
The DS1803 is offered in three standard resistor values
which include the 10K
, 50K
, and 100K
. The resolu-
tion of the potentiometer is defined as R
TOT
/255, where
R
TOT
is the total resistor value of the potentiometer. The
DS1803 is designed to operate using 3V or 5V power
supplies over the industrial (–40
°
C to +85
°
C) tempera-
ture range. Maximum input signal levels across the
potentiometer cannot exceed the operating power sup-
ply of the device.
2–WIRE SERIAL DATA BUS
The DS1803 supports a bi–directional 2–wire bus and
data transmission protocol. A device that sends data on
the bus is defined as a transmitter, and a device receiv-
ing data as a receiver. The device that controls the mes-
sage is called a “master”. The devices that are con-
trolled by the master are “slaves”. The bus must be
controlled by a master device which generates the serial
clock (SCL), controls the bus access, and generates the
START and STOP conditions. The DS1803 operates as
a slave on the 2–wire bus. Connections to the bus are
made via the open–drain I/O lines SDA and SCL.
The following bus protocol has been defined (see
Figure 2).
Data transfer may be initiated only when the bus is not
busy.
During data transfer, the data line must remain stable
whenever the clock line is HIGH. Changes in the data
line while the clock line is high will be interpreted as
control signals.
Accordingly, the following bus conditions have been
defined:
Bus not busy:
Both data and clock lines remain HIGH.
Start data transfer:
A change in the state of the data
line, from HIGH to LOW, while the clock is HIGH, defines
a START condition.
Stop data transfer:
A change in the state of the data
line, from LOW to HIGH, while the clock line is HIGH,
defines the STOP condition.
Data valid:
The state of the data line represents valid
data when, after a START condition, the data line is
stable for the duration of the HIGH period of the clock
signal. The data on the line must be changed during the
LOW period of the clock signal. There is one clock pulse
per bit of data. Figure 2 details how data transfer is
accomplished on the 2–wire bus. Depending upon the
state of the R/W* bit, two types of data transfer are
possible.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS18030-010 | 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 |
| DS18030-010+ | 功能描述:數(shù)字電位計 IC Addressable Dual 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 |
| DS18030-050 | 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 |
| DS18030-050+ | 功能描述:數(shù)字電位計 IC Addressable Dual 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 |
| DS1803-010 | 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:Addressable Dual Digital Potentiometer |
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