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参数资料
型号： MCP4441-503E/ML
厂商： Microchip Technology
文件页数： 94/100页
文件大小： 0K
描述： IC DGTL POT 129TAPS QUAD 20QFN
标准包装： 91
接片： 129
电阻（欧姆）： 50k
电路数： 4
温度系数： 标准值 150 ppm/°C
存储器类型： 非易失
接口： I²C（设备位址）
电源电压： 2.7 V ~ 5.5 V
工作温度： -40°C ~ 125°C
安装类型： 表面贴装
封装/外壳： 20-VFQFN 裸露焊盘
供应商设备封装： 20-QFN 裸露焊盘（4x4）
包装： 管件
2010 Microchip Technology Inc.
DS22265A-page 93
MCP444X/446X
FIGURE B-6:
Resistor Network Block
Diagram.
The characteristics of the wiper are determined by the
characteristics of the wiper switch at each of the
resistor networks tap points. Figure B-7 shows an
example of a wiper switch. As the device operational
voltage becomes lower, the characteristics of the wiper
switch change due to a lower voltage on the VG signal.
Figure B-7 shows an implementation of a wiper switch.
When the transistor is turned off, the switch resistance
is in the Giga
Ωs. When the transistor is turned on, the
switch resistance is dependent on the VG, VW and
VWCn voltages. This resistance is referred to as RW.
FIGURE B-7:
Wiper Switch.
So looking at the wiper voltage (VW) for the
3.0V and 1.8V data gives the graphs in Figure B-8 and
Figure B-9. In the 1.8V graph, as the VW approaches
0.8V, the voltage increases nonlinearly. Since V = I * R,
and the current (IW) is constant, it means that the
device resistance increased nonlinearly at around
wiper code 160.
FIGURE B-8:
Wiper Voltage (VW) vs.
Wiper Code (VDD = 3.0V, IW = 190 A).
FIGURE B-9:
Wiper Voltage (VW) vs.
Wiper Code (VDD = 1.8V, IW = 190 A).
RS
A
RS
B
RW (1)
W
RW (1)
Note 1:
The wiper resistance is dependent on
several factors including, wiper code,
device VDD, Terminal voltages (on A, B
and W), and temperature.
RAB
NMOS
PMOS
N0
Nn-1
N1
Nn
Nn-2
Nn-3
VW
VB
VA
VWC(n-2)
DVG
Note 1:
Wiper Resistance (RW) depends on the
voltages at the wiper switch nodes
(VG, VW and VWCn).
RW (1)
NMOS
PMOS
NWC
Wiper
VG (VDD/VSS)
“gate”
VW
VWCn
0.0
0.2
0.4
0.6
0.8
1.0
1.2
0
32
64
96
128 160 192 224 256
Wiper Code
Wiper
Voltage
(V)
-40C
+25C
+85C
+125C
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
0
32
64
96
128 160 192 224 256
Wiper Code
Wiper
Voltage
(V)
-40C
+25C
+85C
+125C
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MCP4441T-104E/ST 功能描述:数字电位计 IC 100k I2C Qd Ch 7bit Nonvolatile memory RoHS:否 制造商:Maxim Integrated 电阻:200 Ohms 温度系数:35 PPM / C 容差:25 % POT 数量:Dual 每 POT 分接头:256 弧刷存储器:Volatile 缓冲刷: 数字接口:Serial (3-Wire, SPI) 描述/功能:Dual Volatile Low Voltage Linear Taper Digital Potentiometer 工作电源电压:1.7 V to 5.5 V 电源电流:27 uA 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:TQFN-16 封装:Reel
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