參數(shù)資料
型號： MCP4018T-503E/LT
廠商： Microchip Technology
文件頁數(shù)： 36/51頁
文件大?。?/td> 0K
描述： IC DGTL POT 50K 128TAPS SC70-6
標準包裝： 1
接片： 128
電阻（歐姆）： 50k
電路數(shù)： 1
溫度系數(shù)： 標準值 150 ppm/°C
存儲器類型： 易失
接口： I²C
電源電壓： 1.8 V ~ 5.5 V
工作溫度： -40°C ~ 125°C
安裝類型： 表面貼裝
封裝/外殼： 6-TSSOP，SC-88，SOT-363
供應商設備封裝： SC-70-6
包裝： 標準包裝
產(chǎn)品目錄頁面： 674 (CN2011-ZH PDF)
其它名稱： MCP4018T-503E/LTDKR
2009 Microchip Technology Inc.
DS22147A-page 41
MCP4017/18/19
6.0
RESISTOR NETWORK
The Resistor Network is made up of two parts. These
are:
Resistor Ladder
Wiper
Figure 6-1 shows a block diagram for the resistive
network.
Digital potentiometer applications can be divided into
two resistor network categories:
Rheostat configuration
Potentiometer (or voltage divider) configuration
The MCP4017 is a true rheostat, with terminal B and
the wiper (W) of the variable resistor available on pins.
The MCP4018 device offers a voltage divider
(potentiometer) with terminal B internally connected to
ground.
The MCP4019 device is a Rheostat device with
terminal A of the resistor floating, terminal B internally
connected to ground, and the wiper (W) available on
pin.
6.1
Resistor Ladder Module
The resistor ladder is a series of equal value resistors
(RS) with a connection point (tap) between the two
resistors. The total number of resistors in the series
(ladder) determines the RAB resistance (see Figure 6-
1). The end points of the resistor ladder are connected
to the device Terminal A and Terminal B pins. The RAB
(and RS) resistance has small variations over voltage
and temperature.
The Resistor Network has 127 resistors in a string
between terminal A and terminal B. This gives 7-bits of
resolution.
The wiper can be set to tap onto any of these 127
resistors thus providing 128 possible settings
(including terminal A and terminal B). This allows zero
scale to full scale connections.
A wiper setting of 00h connects the Terminal W (wiper)
to Terminal B (Zero Scale). A wiper setting of 3Fh is the
Mid scale setting. A wiper setting of 7Fh connects the
Terminal W (wiper) to Terminal A (Full Scale). Table 6-
1 illustrates the full wiper setting map.
Terminal A and B as well as the wiper W do not have a
polarity. These terminals can support both positive and
negative current.
FIGURE 6-1:
Resistor Network Block
Diagram.
TABLE 6-1:
WIPER SETTING MAP
Wiper Setting
Properties
07Fh
Full Scale (W = A)
07Eh - 040h
W = N
03Fh
W = N (Mid Scale)
03Eh - 001h
W = N
000h
Zero Scale (W = B)
RS
A
RS
B
N = 127
N = 126
N = 125
N = 1
N = 0
RW (1)
W
01h
Analog
Mux
RW (1)
00h
RW (1)
7Dh
RW (1)
7Eh
RW (1)
7Fh
Note 1: The wiper resistance is tap dependent.
That is, each tap selection resistance
has a small variation. This variation has
more effect on devices with smaller RAB
resistance (5.0 k
Ω).
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