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參數(shù)資料
| 型號： | DS1868-50 |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 7/14頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC POT DIGITAL DUAL 50K 14-DIP |
| 產(chǎn)品培訓模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標準包裝： | 25 |
| 接片： | 256 |
| 電阻（歐姆）： | 50k |
| 電路數(shù)： | 2 |
| 溫度系數(shù)： | 標準值 750 ppm/°C |
| 存儲器類型： | 易失 |
| 接口： | 3 線串口 |
| 電源電壓： | 2.7 V ~ 3.3 V，4.5 V ~ 5.5 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 通孔 |
| 封裝/外殼： | 14-DIP（0.300"，7.62mm） |
| 供應商設備封裝： | 14-PDIP |
| 包裝： | 管件 |
DS1868
2 of 14
wiper on the resistor array is set by an 8-bit value that controls which tap point is connected to the wiper
output. Communication and control of the device is accomplished via a 3-wire serial port interface. This
interface allows the device wiper position to be read or written.
Both potentiometers can be connected in series (or stacked) for an increased total resistance with the same
resolution. For multiple-device, single-processor environments, the DS1868 can be cascaded or daisy
chained. This feature provides for control of multiple devices over a single 3-wire bus.
The DS1868 is offered in three standard resistance values which include 10, 50, and 100 kohm versions.
The part is available in 16-pin SOIC (300-mil), 14-pin DIP, and 20-pin (173-mil) TSSOP packages.
OPERATION
The DS1868 contains two 256-position potentiometers whose wiper positions are set by an 8-bit value.
These two 8-bit values are written to a 17-bit I/O shift register which is used to store the two wiper
positions and the stack select bit when the device is powered. A block diagram of the DS1868 is
presented in Figure 1.
Communication and control of the DS1868 is accomplished through a 3-wire serial port interface that
drives an internal control logic unit. The 3-wire serial interface consists of the three input signals: RST ,
CLK, and DQ.
The RST control signal is used to enable the 3-wire serial port operation of the device. The RST signal is
an active high input and is required to begin any communication to the DS1868. The CLK signal input is
used to provide timing synchronization for data input and output. The DQ signal line is used to transmit
potentiometer wiper settings and the stack select bit configuration to the 17-bit I/O shift register of the
DS1868.
Figure 9(a) presents the 3-wire serial port protocol. As shown, the 3-wire port is inactive when the RST
signal input is low. Communication with the DS1868 requires the transition of the RST input from a low
state to a high state. Once the 3-wire port has been activated, data is entered into the part on the low to
high transition of the CLK signal inputs. Three-wire serial timing requirements are provided in the timing
diagrams of Figure 9(b),(c).
Data written to the DS1868 over the 3-wire serial interface is stored in the 17-bit I/O shift register (see
Figure 2). The 17-bit I/O shift register contains both 8-bit potentiometer wiper position values and the
stack select bit. The composition of the I/O shift register is presented in Figure 2. Bit 0 of the I/O shift
register contains the stack select bit. This bit will be discussed in the section entitled Stacked
Configuration. Bits 1 through 8 of the I/O shift register contain the potentiometer-1 wiper position value.
Bit 1 will contain the MSB of the wiper setting for potentiometer-1 and bit 8 the LSB for the wiper
setting. Bits 9 through 16 of the I/O shift register contain the value of the potentiometer-0 wiper position
with the MSB for the wiper position occupying bit 9 and the LSB bit 16.
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| DS1868-50+ | 功能描述:數(shù)字電位計 IC 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 |
| DS1868BE-010+ | 制造商:Maxim Integrated Products 功能描述:DUAL 256-STEP DIGITAL POTENTIOMETER - Rail/Tube 制造商:Maxim Integrated Products 功能描述:IC DGTL POT 10K 2CH 20TSSOP |
| DS1868BE-010+T/R | 制造商:Maxim Integrated Products 功能描述:DUAL 256-STEP DIGITAL POTENTIOMETER - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC DGTL POT 10K 2CH 20TSSOP |
| DS1868BE-050+ | 制造商:Maxim Integrated Products 功能描述:DUAL 256-STEP DIGITAL POTENTIOMETER, 50K OHM END TO END RESI - Rail/Tube |
| DS1868BE-050+T/R | 制造商:Maxim Integrated Products 功能描述:DUAL 256-STEP DIGITAL POTENTIOMETER, 50K OHM END TO END RESI - Tape and Reel |
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