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| 型號： | MCP4661T-503E/ML |
| 廠商： | Microchip Technology |
| 文件頁數(shù)： | 64/92頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC DGTL POT 50K 256TAPS 16-QFN |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 接片： | 257 |
| 電阻（歐姆）： | 50k |
| 電路數(shù)： | 2 |
| 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： | 16-VQFN 裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | 16-QFN-EP（4x4） |
| 包裝： | 標(biāo)準(zhǔn)包裝 |
| 產(chǎn)品目錄頁面： | 677 (CN2011-ZH PDF) |
| 其它名稱： | MCP4661T-503E/MLDKR |
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2008 Microchip Technology Inc.
DS22107A-page 67
MCP454X/456X/464X/466X
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
MCP454X/456X/464X/466X
devices can be used to replace the common mechani-
cal 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 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
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 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 Non-volatile Digital Potentiometer Evalua-
tion 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 pin to change the stored value of the
wiper. The MCP402X Non-volatile Digital Potentiome-
ter Evaluation 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 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 HVC pin
(when the system voltage is approximately 5V).
FIGURE 8-2:
MCP4XXX Non-Volatile
Digital Potentiometer Evaluation Board
(MCP402XEV) implementation to generate the
VIHH voltage.
HVC
PIC MCU
MCP45XX
R1
IO1
IO2
C2
TC1240A
VIN
SHDN
C+
C-
VOUT
C1
MCP46XX
HVC
PIC10F206
MCP4XXX
R1
GP0
GP2
C2
C1
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| MCP4662-103E/UN | 功能描述:數(shù)字電位計 IC Sngl 8B NV I2C Rheo RoHS:否 制造商:Maxim Integrated 電阻:200 Ohms 溫度系數(shù):35 PPM / C 容差:25 % POT 數(shù)量:Dual 每 POT 分接頭:256 弧刷存儲器:Volatile 緩沖刷: 數(shù)字接口:Serial (3-Wire, SPI) 描述/功能:Dual Volatile Low Voltage Linear Taper Digital Potentiometer 工作電源電壓:1.7 V to 5.5 V 電源電流:27 uA 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFN-16 封裝:Reel |
| MCP4662-104E/UN | 功能描述:數(shù)字電位計 IC Sngl 8B NV I2C Rheo RoHS:否 制造商:Maxim Integrated 電阻:200 Ohms 溫度系數(shù):35 PPM / C 容差:25 % POT 數(shù)量:Dual 每 POT 分接頭:256 弧刷存儲器:Volatile 緩沖刷: 數(shù)字接口:Serial (3-Wire, SPI) 描述/功能:Dual Volatile Low Voltage Linear Taper Digital Potentiometer 工作電源電壓:1.7 V to 5.5 V 電源電流:27 uA 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFN-16 封裝:Reel |
| MCP4662-104E/UN | 制造商:Microchip Technology Inc 功能描述:; LEADED PROCESS COMPATIBLE:YES; PEAK RE |
| MCP4662-502E/UN | 功能描述:數(shù)字電位計 IC Sngl 8B NV I2C Rheo RoHS:否 制造商:Maxim Integrated 電阻:200 Ohms 溫度系數(shù):35 PPM / C 容差:25 % POT 數(shù)量:Dual 每 POT 分接頭:256 弧刷存儲器:Volatile 緩沖刷: 數(shù)字接口:Serial (3-Wire, SPI) 描述/功能:Dual Volatile Low Voltage Linear Taper Digital Potentiometer 工作電源電壓:1.7 V to 5.5 V 電源電流:27 uA 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFN-16 封裝:Reel |
| MCP4662-502E/UN | 制造商:Microchip Technology Inc 功能描述:; LEADED PROCESS COMPATIBLE:YES; PEAK RE |
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