參數(shù)資料
型號(hào)： AD5258BRMZ11
廠商： Analog Devices, Inc.
元件分類： 數(shù)字電位計(jì)
英文描述： Nonvolatile, I2C-Compatible 64-Position, Digital Potentiometer
中文描述： 非易失，I2C兼容的64工位，數(shù)字電位器
文件頁數(shù)： 20/24頁
文件大?。?/td> 1299K
代理商： AD5258BRMZ11
AD5258
DISPLAY APPLICATIONS
CIRCUITRY
A special feature of the AD5258 is its unique separation of the
V
LOGIC
and V
DD
supply pins. The reason for doing this is to
provide greater flexibility in applications that do not always
provide needed supply voltages.
Rev. 0 | Page 20 of 24
In particular, LCD panels often require a V
COM
voltage in the
range of 3 V to 5 V. The circuit in Figure 45 is the rare exception
in which a 5 V supply is available to power the digital
potentiometer.
0
A
B
W
R2
10k
R1
70k
R3
25k
V
DD
V
LOGIC
SCL
SDA
GND
–
+
U1
AD8565
3.5V < V
COM
< 4.5V
14.4V
VCC (~3.3V)
5V
AD5258
MCU
C1
1
μ
F
R5
10k
R6
10k
Figure 45. V
COM
Adjustment Application
In the more common case shown in Figure 46, only analog 14.4 V
and digital logic 3.3 V supplies are available. By placing discrete
resistors above and below the digital pot, V
DD
can now be tapped
off the resistor string itself. Based on the chosen resistor values,
the voltage at V
DD
in this case equals 4.8 V, allowing the wiper to
be safely operated all the way up to 4.8 V. The current draw of
V
DD
will not affect that node’s bias because it is only on the
order of microamps. V
LOGIC
is tied to the MCU’s 3.3 V digital
supply because V
LOGIC
will draw the 35 mA which is needed
when writing to the EEPROM. It would be impractical to try
and source 35 mA through the 70 k resistor, therefore, V
LOGIC
is not connected to the same node as V
DD
.
For this reason, V
LOGIC
and V
DD
are provided as two separate
supply pins that can either be tied together or treated inde-
pendently; V
LOGIC
supplying the logic/EEPROM with power,
and V
DD
biasing up the A, B, and W terminals for added
flexibility.
0
A
B
W
R2
R1
70k
R3
25k
V
DD
V
LOGIC
SCL
SDA
GND
–
+
U1
AD8565
3.5V < V
COM
< 4.5V
14.4V
VCC (~3.3V)
AD5258
MCU
C1
1
μ
F
R5
10k
R6
10k
SUPPLIES POWER
TO BOTH THE
LOGIC SUPPLY OF
THE DIGITAL POT
Figure 46. Circuitry When a Separate Supply is Not Available for V
DD
For a more detailed look at this application, refer to the article,
“Simple VCOM Adjustment uses any Logic Supply Voltage” in
the September 30, 2004, issue of
EDN
magazine.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AD5258BRMZ1-R7 功能描述:IC POT DGTL I2C 1K 64P 10MSOP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 數(shù)字電位器 系列:- 標(biāo)準(zhǔn)包裝:3,000 系列:DPP 接片:32 電阻（歐姆）:10k 電路數(shù):1 溫度系數(shù):標(biāo)準(zhǔn)值 300 ppm/°C 存儲(chǔ)器類型:非易失 接口:3 線串行（芯片選擇，遞增，增/減） 電源電壓:2.5 V ~ 6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-WFDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:8-TDFN（2x3） 包裝:帶卷 (TR)
AD5258BRMZ1-R71 制造商:AD 制造商全稱:Analog Devices 功能描述:Nonvolatile, I2C-Compatible 64-Position, Digital Potentiometer
AD5258BRMZ1-RL7 制造商:AD 制造商全稱:Analog Devices 功能描述:Nonvolatile, I2C-Compatible 64-Position, Digital Potentiometer
AD5258BRMZ50 功能描述:IC POT DGTL I2C 50K 64P 10MSOP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 數(shù)字電位器 系列:- 標(biāo)準(zhǔn)包裝:3,300 系列:WiperLock™ 接片:257 電阻（歐姆）:100k 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:3 線 SPI（芯片選擇） 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-VDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:8-DFN-EP（3x3） 包裝:帶卷 (TR)
AD5258BRMZ501 制造商:AD 制造商全稱:Analog Devices 功能描述:Nonvolatile, I2C-Compatible 64-Position, Digital Potentiometer
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