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| 型號(hào)： | MCP4011T-502E/MC |
| 廠商： | Microchip Technology |
| 文件頁數(shù)： | 39/54頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC DGTL POT 5K 1CH 8DFN |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 接片： | 64 |
| 電阻（歐姆）： | 5k |
| 電路數(shù)： | 1 |
| 溫度系數(shù)： | 標(biāo)準(zhǔn)值 150 ppm/°C |
| 存儲(chǔ)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(biāo)準(zhǔn)包裝 |
| 其它名稱： | MCP4011T-502E/MCDKR |
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MCP4011/2/3/4
DS21978C-page 44
2006 Microchip Technology Inc.
8.0
APPLICATIONS EXAMPLES
Non-volatile digital potentiometers have a multitude of
practical uses in modern electronic circuits. The most
popular uses include precision calibration of set point
thresholds, sensor trimming, LCD bias trimming, audio
attenuation, adjustable power supplies, motor control
overcurrent trip setting, adjustable gain amplifiers and
offset trimming. The MCP4011/2/3/4 devices can be
used to replace the common mechanical trim pot in
applications where the operating and terminal voltages
are within CMOS process limitations (VDD = 2.7V to
5.5V).
8.1
Set Point Threshold Trimming
Applications that need accurate detection of an input
threshold event often need several sources of error
eliminated. Use of comparators and operational
amplifiers (op amps) with low offset and gain error can
help achieve the desired accuracy, but in many
applications, the input source variation is beyond the
designer’s control. If the entire system can be
calibrated after assembly in a controlled environment
(like factory test), these sources of error are minimized,
if not entirely eliminated.
Figure 8-1 illustrates a common digital potentiometer
configuration. This configuration is often referred to as
a “windowed voltage divider”. Note that R1 and R2 are
not necessary to create the voltage divider, but their
presence is useful when the desired threshold has
limited range. It is “windowed” because R1 and R2 can
narrow the adjustable range of VTRIP to a value much
less than VDD – VSS. If the output range is reduced, the
magnitude of each output step is reduced. This
effectively increases the trimming resolution for a fixed
digital potentiometer resolution. This technique may
allow a lower-cost digital potentiometer to be utilized
(64 steps instead of 256 steps).
The MCP4011’s and MCP4013’s low DNL performance
is critical to meeting calibration accuracy in production
without having to use a higher precision digital
potentiometer.
EQUATION 8-1:
CALCULATING THE
WIPER SETTING FROM
THE DESIRED VTRIP
FIGURE 8-1:
Using the Digital
Potentiometer to Set a Precise Output Voltage.
8.1.1
TRIMMING A THRESHOLD FOR AN
OPTICAL SENSOR
If the application has to calibrate the threshold of a
diode, transistor or resistor, a variation range of 0.1V is
common. Often, the desired resolution of 2 mV or
better is adequate to accurately detect the presence of
a precise signal. A “windowed” voltage divider, utilizing
the MCP4011 or MCP4013, would be a potential
solution as shown in Figure 8-2.
FIGURE 8-2:
Set Point or Threshold
Calibration.
VTRIP
VDD
R2 RWB
+
R1 RAB R2
++
-----------------------------------
=
RAB
RNominal
=
RWB
RAB
D
63
------
=
D
VTRIP
VDD
--------------
R1 RAB R2
++
() R
2
–
()
63
=
Where:
D = Digital Potentiometer Wiper Setting (0-63)
VDD
VOUT
R2
A
R1
W
B
MCP4011
CS
U/D
VTRIP
0.1 F
Comparator
VCC+
VCC–
VDD
Rsense
R1
R2
B
A
VDD
W
MCP4011
CS
U/D
MCP6021
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