參數(shù)資料
型號： MCP4442T-502E/ST
廠商： Microchip Technology
文件頁數(shù)： 94/100頁
文件大?。?/td> 0K
描述： IC DGTL POT 129TAPS 5K 14TSSOP
標(biāo)準(zhǔn)包裝： 2,500
接片： 129
電阻（歐姆）： 5k
電路數(shù)： 4
溫度系數(shù)： 標(biāo)準(zhǔn)值 150 ppm/°C
存儲器類型： 非易失
接口： I²C（設(shè)備位址）
電源電壓： 2.7 V ~ 5.5 V
工作溫度： -40°C ~ 125°C
安裝類型： 表面貼裝
封裝/外殼： 14-TSSOP（0.173"，4.40mm 寬）
供應(yīng)商設(shè)備封裝： 14-TSSOP
包裝： 帶卷 (TR)
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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