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| 型號： | MCP4011T-503E/MC |
| 廠商： | Microchip Technology |
| 文件頁數(shù)： | 20/54頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC DGTL POT 50K 1CH 8DFN |
| 標準包裝： | 1 |
| 接片： | 64 |
| 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： | 2 線串行（芯片選擇，增/減） |
| 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： | 8-VFDFN 裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | 8-DFN（2x3） |
| 包裝： | 標準包裝 |
| 其它名稱： | MCP4011T-503E/MCDKR |
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2006 Microchip Technology Inc.
DS21978C-page 27
MCP4011/2/3/4
4.0
GENERAL OVERVIEW
The MCP4011/2/3/4 devices are general purpose
digital potentiometers intended to be used in
applications where a programmable resistance with
moderate bandwidth is desired.
Applications generally suited for the MCP4011/2/3/4
devices include:
Set point or offset trimming
Sensor calibration
Selectable gain and offset amplifier designs
Cost-sensitive mechanical trim pot replacement
The digital potentiometer is available in four nominal
resistances (RAB), where the nominal resistance is
defined as the resistance between terminal A and
terminal B. The four nominal resistances are 2.1 k
Ω,
5k
Ω, 10 kΩ and 50 kΩ.
There are 63 resistors in a string between terminal A
and terminal B. The wiper can be set to tap onto any of
these 63 resistors thus providing 64 possible settings
(including terminal A and terminal B).
Figure 4-1 shows a block diagram for the resistive
network of the device. Equation 4-1 shows the
calculation for the step resistance, while Equation 4-2
illustrates the calculation used to determine the
resistance between the wiper and terminal B.
FIGURE 4-1:
Resistor Block Diagram.
EQUATION 4-1:
RS CALCULATION
EQUATION 4-2:
RWB CALCULATION
1 LSb is the ideal resistance difference between two
successive codes. If we use N = 1 and RW = 0 in
Equation 4-2, we can calculate the step size for each
increment or decrement command.
The MCP4011 device offers a voltage divider
(potentiometer) with all terminals available on pins.
The MCP4012 is a true rheostat, with terminal A and
the wiper (W) of the variable resistor available on pins.
The MCP4013 device offers a voltage divider (potenti-
ometer) with terminal B connected to ground.
The MCP4014 device is a Rheostat device with
terminal A of the resistor floating, terminal B connected
to ground, and the wiper (W) available on pin.
The MCP4011 can be externally configured to
implement any of the MCP4012, MCP4013 or
MCP4014 configurations.
4.1
Serial Interface
A 2-wire synchronous serial protocol is used to
increment or decrement the digital potentiometer’s
wiper terminal. The Increment/Decrement (U/D)
protocol utilizes the CS and U/D input pins. Both inputs
are tolerant of signals up to 12.5V without damaging
the device. The CS pin can differenciate between two
high-voltage levels, VIH and VIHH. This enables
additional commands without requiring additional input
pins. The high-voltage commands (VIHH on the CS pin)
are similar to the standard commands and are
supported for compatability to the MCP401X family of
devices.
The simple U/D protocol uses the state of the U/D pin
at the falling edge of the CS pin to determine if
Increment or Decrement mode is desired. Subsequent
rising edges of the U/D pin move the wiper.
The wiper value will not underflow or overflow.
RS
A
RS
B
N = 63
N = 62
N = 61
N = 1
N = 0
RW (1)
W
01h
Analog
Mux
RW (1)
00h
RW (1)
3Dh
RW (1)
3Eh
RW (1)
3Fh
Note 1: The wiper resistance is tap dependent.
That is, each tap selection resistance
has a small variation. This variation
effects the smaller resistance devices
(2.1 k
Ω) more.
RS
RAB
63
---------
=
RWB
RABN
63
-------------- RW
+
=
N = 0 to 63 (decimal)
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