參數(shù)資料
型號： MCP42100T
廠商： Microchip Technology Inc.
元件分類： 數(shù)字電位計
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)： 16/33頁
文件大?。?/td> 682K
代理商： MCP42100T
MCP41XXX/42XXX
DS11195C-page 16
2003 Microchip Technology Inc.
FIGURE 4-7:
programmable differential amplifier using digital
potentiometers.
Single Supply
4.2.3
PROGRAMMABLE OFFSET TRIM
For applications requiring only a programmable voltage
reference, the circuit in Figure 4-8 can be used. This
circuit shows the device used in the potentiometer
mode along with two resistors and a buffered output.
This creates a circuit with a linear relationship between
voltage-out and programmed code. Resistors R
1
and
R
2
can be used to increase or decrease the output volt-
age step size. The potentiometer in this mode is stable
over temperature. The operation of this circuit over
temperature is shown in Figure 2-3. The worst perfor-
mance over temperature will occur at the lower codes
due to the dominating wiper resistance. R
1
and R
2
can
also be used to affect the boundary voltages, thereby
eliminating the use of these lower codes.
FIGURE 4-8:
R
1
and R
2
, the voltage output resolution of this
programmable voltage reference circuit is
affected.
By changing the values of
4.3
Calculating Resistances
When programming the digital potentiometer settings,
the following equations can be used to calculate the
resistances. Programming code 00h effectively brings
the wiper to the B terminal, leaving only the wiper resis-
tance. Programming higher codes will bring the wiper
closer to the A terminal of the potentiometer. The equa-
tions in Figure 4-9 can be used to calculate the terminal
resistances. Figure 4-10 shows an example calculation
using a 10 k
potentiometer.
FIGURE 4-9:
are a function of code. It should be noted that,
when using these equations for most feedback
amplifier circuits (see Figure 4-4 and Figure 4-5),
the wiper resistance can be omitted due to the
high impedance input of the amplifier.
Potentiometer resistances
FIGURE 4-10:
calculations.
Example Resistance
MCP601
V
B
V
SS
V
DD
-IN
+IN
V
OUT
A
B
A
B
(SIG -)
M
MCP42010
1/2
1
V
REF
NOTE:
Potentiometer values must be equal
+
-
Where:
R
A
R
256
(
--------------------------------------
D
n
–
)
256
=
R
B
R
D
n
256
------------------
=
R
AB
D
n
Total Resistance of pot
=
Wiper setting forD
n
0 to 255
=
=
V
OUT
V
A
V
B
–
(
)
R
B
R
A
-------
=
V
A
(SIG +)
MCP606
OUT
V
SS
V
DD
-IN
+IN
V
DD
V
SS
R
1
R
2
B
A
M
0.1 uF
+
-
PA
PB
PW
Where:
PA is the A terminal
PB is the B terminal
PW is the wiper terminal
R
WA
is resistance between Terminal A and wiper
R
WB
is resistance between Terminal B and Wiper
R
AB
is overall resistance for pot (10 k
, 50 k
or 100 k
)
R
W
is wiper resistance
D
n
is 8-bit value in data register for pot number n
R
WA
D
n
(
)
R
---------------------------------D
(
)
256
(
256
n
)
R
W
+
=
R
WB
D
n
(
)
R
---------------------------
(
)
D
n
(
256
)
R
W
+
=
Example:
R = 10 k
Code = C0h = 192d
Note:
All values shown are typical and
actual results will vary
.
PA
PW
PB
(
-----------------------------------D
10 k
R
WA
D
n
(
)
R
)
256
(
256
n
)
R
W
)
+
=
R
WB
C0h
(
R
WB
C0h
(
)
-10k
(
)
192
(
256
)
52
+
=
R
WA
C0h
(
R
WA
C0h
)
-10k
(
)
256
(
256
192
–
52
+
=
(
)
2552
=
R
WB
D
n
(
)
R
---------256
(
)
D
(
)
R
W
+
=
)
7552
=
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MCP42100T-E/SL 功能描述:數(shù)字電位計 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
MCP42100T-E/ST 功能描述:數(shù)字電位計 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
MCP42100T-I/SL 功能描述:數(shù)字電位計 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
MCP42100T-I/ST 功能描述:數(shù)字電位計 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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