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| 型號(hào)： | MCP4441T-104E/ST |
| 廠商： | Microchip Technology |
| 文件頁數(shù)： | 72/100頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC DGTL POT 129TAPS QUAD 20TSSOP |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 接片： | 129 |
| 電阻（歐姆）： | 100k |
| 電路數(shù)： | 4 |
| 溫度系數(shù)： | 標(biāo)準(zhǔn)值 150 ppm/°C |
| 存儲(chǔ)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： | 20-TSSOP（0.173"，4.40mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 20-TSSOP |
| 包裝： | 帶卷 (TR) |
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2010 Microchip Technology Inc.
DS22265A-page 73
MCP444X/446X
8.0
APPLICATIONS EXAMPLES
Nonvolatile 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 MCP44XX 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
Techniques to Force the HVC/A0
Pin to VIHH
The circuit in Figure 8-1 shows a method using the
TC1240A doubling charge pump. When the SHDN pin
is high, the TC1240A is off, and the level on the HVC/
A0 pin is controlled by the PIC microcontrollers
(MCUs) IO2 pin.
When the SHDN pin is low, the TC1240A is on and the
VOUT voltage is 2 * VDD. The resistor R1 allows the
HVC/A0 pin to go higher than the voltage such that the
PIC MCU’s IO2 pin “clamps” at approximately VDD.
FIGURE 8-1:
Using the TC1240A to
Generate the VIHH Voltage.
The circuit in Figure 8-2 shows the method used on the
MCP402X Nonvolatile Digital Potentiometer Evaluation
Board (Part Number: MCP402XEV). This method
requires that the system voltage be approximately 5V.
This ensures that when the PIC10F206 enters a brown-
out condition, there is an insufficient voltage level on
the HVC/A0 pin to change the stored value of the wiper.
The MCP402X Nonvolatile Digital Potentiometer Eval-
uation Board User’s Guide (DS51546) contains a
complete schematic.
GP0 is a general purpose I/O pin, while GP2 can either
be a general purpose I/O pin or it can output the internal
clock.
For the serial commands, configure the GP2 pin as an
input (high impedance). The output state of the GP0 pin
will determine the voltage on the HVC/A0 pin (VIL or
VIH).
For high-voltage serial commands, force the GP0
output pin to output a high level (VOH) and configure the
GP2 pin to output the internal clock. This will form a
charge pump and increase the voltage on the CS pin
(when the system voltage is approximately 5V).
FIGURE 8-2:
MCP4XXX Nonvolatile
Digital Potentiometer Evaluation Board
(MCP402XEV) implementation to generate the
VIHH voltage.
HVC/A0
PIC MCU
MCP4XXX
R1
IO1
IO2
C2
TC1240A
VIN
SHDN
C+
C-
VOUT
C1
HVC/A0
PIC10F206
MCP4XXX
R1
GP0
GP2
C2
C1
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