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参数资料
| 型号： | AD5258BRMZ100-R71 |
| 厂商： | Analog Devices, Inc. |
| 元件分类： | 数字电位计 |
| 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，数字电位器 |
| 文件页数： | 20/24页 |
| 文件大小： | 1299K |
| 代理商： | AD5258BRMZ100-R71 |
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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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD5258BRMZ101 | 制造商:AD 制造商全称:Analog Devices 功能描述:Nonvolatile, I2C-Compatible 64-Position, Digital Potentiometer |
| AD5258BRMZ10-R7 | 功能描述:IC POT DGTL I2C 10K 64P 10MSOP RoHS:是 类别:集成电路 (IC) >> 数据采集 - 数字电位器 系列:- 标准包装:3,000 系列:DPP 接片:32 电阻（欧姆）:10k 电路数:1 温度系数:标准值 300 ppm/°C 存储器类型:非易失 接口:3 线串行（芯片选择，递增，增/减） 电源电压:2.5 V ~ 6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-WFDFN 裸露焊盘 供应商设备封装:8-TDFN（2x3） 包装:带卷 (TR) |
| AD5258BRMZ10-R71 | 制造商:AD 制造商全称:Analog Devices 功能描述:Nonvolatile, I2C-Compatible 64-Position, Digital Potentiometer |
| AD5258BRMZ11 | 制造商:AD 制造商全称:Analog Devices 功能描述:Nonvolatile, I2C-Compatible 64-Position, Digital Potentiometer |
| AD5258BRMZ1-R7 | 功能描述:IC POT DGTL I2C 1K 64P 10MSOP RoHS:是 类别:集成电路 (IC) >> 数据采集 - 数字电位器 系列:- 标准包装:3,000 系列:DPP 接片:32 电阻（欧姆）:10k 电路数:1 温度系数:标准值 300 ppm/°C 存储器类型:非易失 接口:3 线串行（芯片选择，递增，增/减） 电源电压:2.5 V ~ 6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-WFDFN 裸露焊盘 供应商设备封装:8-TDFN（2x3） 包装:带卷 (TR) |
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