參數(shù)資料
型號(hào)： MCP41100T
廠商： Microchip Technology Inc.
元件分類： 數(shù)字電位計(jì)
英文描述： Single/Dual Digital Potentiometer with SPI⑩ Interface
中文描述： 單/雙數(shù)字電位器接口與SPI⑩
文件頁數(shù)： 14/33頁
文件大?。?/td> 682K
代理商： MCP41100T
MCP41XXX/42XXX
DS11195C-page 14
2003 Microchip Technology Inc.
4.1
Modes of Operation
Digital potentiometer applications can be divided into
two categories: rheostat mode and potentiometer, or
voltage divider, mode.
4.1.1
RHEOSTAT MODE
In the rheostat mode, the potentiometer is used as a
two-terminal resistive element. The unused terminal
should be tied to the wiper, as shown in Figure 4-2.
Note that reversing the polarity of the A and B terminals
will not affect operation.
FIGURE 4-2:
configuration for the digital potentiometer. Acting
as a resistive element in the circuit, resistance is
controlled by changing the wiper setting.
Two-terminal or rheostat
Using the device in this mode allows control of the total
resistance between the two nodes. The total measured
resistance would be the least at code 00h, where the
wiper is tied to the B terminal. The resistance at this
code is equal to the wiper resistance, typically 52
for
the 10 k
MCP4X010 devices, 125
for the 50 k
(MCP4X050), and 100 k
(MCP4X100) devices. For
the 10 k
device, the LSB size would be 39.0625
(assuming 10 k
total resistance). The resistance
would then increase with this LSB size until the total
measured resistance at code FFh would be 9985.94
.
The wiper will never directly connect to the A terminal
of the resistor stack.
In the 00h state, the total resistance is the wiper resis-
tance. To avoid damage to the internal wiper circuitry in
this configuration, care should be taken to ensure the
current flow never exceeds 1 mA.
For dual devices, the variation of channel-to-channel
matching of the total resistance from A to B is less than
1%. The device-to-device matching, however, can vary
up to 30%. In the rheostat mode, the resistance has a
positive temperature coefficient. The change in wiper-
to-end terminal resistance over temperature is shown
in Figure 2-8. The most variation over temperature will
occur in the first 6% of codes (code 00h to 0Fh) due to
the wiper resistance coefficient affecting the total resis-
tance. The remaining codes are dominated by the total
resistance tempco R
AB
, typically 800 ppm/°C.
4.1.2
POTENTIOMETER MODE
In the potentiometer mode, all three terminals of the
device are tied to different nodes in the circuit. This
allows the potentiometer to output a voltage propor-
tional to the input voltage. This mode is sometimes
called voltage divider mode. The potentiometer is used
to provide a variable voltage by adjusting the wiper
position between the two endpoints as shown in
Figure 4-3. Note that reversing the polarity of the A and
B terminals will not affect operation.
FIGURE 4-3:
divider mode.
Three terminal or voltage
In this configuration, the ratio of the internal resistance
defines the temperature coefficient of the device. The
resistor matching of the R
WB
resistor to the R
AB
resistor
performs with a typical temperature coefficient of
1 ppm/°C (measured at code 80h). At lower codes, the
wiper resistance temperature coefficient will dominate.
Figure 2-3 shows the effect of the wiper. Above the
lower codes, this figure shows that 70% of the states
will typically have a temperature coefficient of less than
5 ppm/°C. 30% of the states will typically have a
ppm/°C of less than 1.
A
B
W
MCP4XXXX
Resistor
A
B
MCP4XXXX
W
V
1
V
2
相關(guān)PDF資料
PDF描述
MCP41XXX 400000 SYSTEM GATE 2.5 VOLT FPGA - NOT RECOMMENDED for NEW DESIGN
MCP42010 Single/Dual Digital Potentiometer with SPI Interface(單/雙數(shù)字電位器，帶SPI接口)
MCP42050 Single/Dual Digital Potentiometer with SPI Interface(單/雙數(shù)字電位器，帶SPI接口)
MCP450 400000 SYSTEM GATE 1.8 VOLT FPGA - NOT RECOMMENDED for NEW DESIGN
MCP450WFB 13.56 MHz Read/Write Passive RFID Device
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MCP41100TE/P 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:Single/Dual Digital Potentiometer with SPI Interface
MCP41100TE/SL 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:Single/Dual Digital Potentiometer with SPI Interface
MCP41100TE/SN 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:Single/Dual Digital Potentiometer with SPI Interface
MCP41100T-E/SN 功能描述:數(shù)字電位計(jì) IC 256 Step SPI 100kOhm 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(chǔ)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(fēng)格:SMD/SMT 封裝 / 箱體:TQFN-16 封裝:Reel
MCP41100TE/ST 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:Single/Dual Digital Potentiometer with SPI Interface
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。

采購需求

(若只采購一條型號(hào)，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購

我的聯(lián)系方式

*
*
*