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参数资料
| 型号： | AD5259EVAL2 |
| 厂商： | Analog Devices, Inc. |
| 元件分类： | 数字电位计 |
| 英文描述： | Nonvolatile, I2C-Compatible 256-Position, Digital Potentiometer |
| 中文描述： | 非易失，I2C兼容256级，数字电位器 |
| 文件页数： | 20/24页 |
| 文件大小： | 1039K |
| 代理商： | AD5259EVAL2 |
AD5259
DISPLAY APPLICATIONS
CIRCUITRY
A special feature of the AD5259 is its unique separation of the
V
LOGIC
and V
DD
supply pins. The separation provides greater
flexibility in applications that do not always provide needed
supply voltages.
Rev. A | 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 46 is the rare excep-
tion in which a 5 V supply is available to power the digital
potentiometer.
0
A
B
W
R2
10k
Ω
R1
70k
Ω
R3
25k
Ω
V
DD
V
LOGIC
SCL
SDA
GND
–
+
U1
AD8565
3.5V < V
COM
< 4.5V
14.4V
VCC (~3.3V)
5V
AD5259
MCU
C1
1
μ
F
R5
10k
Ω
R6
10k
Ω
Figure 46. V
COM
Adjustment Application
In the more common case shown in Figure 47, only analog 14.4 V
and digital logic 3.3 V supplies are available. By placing discrete
resistors above and below the digital potentiometer, 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 imprac-
tical to try and source 35 mA through the 70 kΩ 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
10k
Ω
R1
70k
Ω
R3
25k
Ω
V
DD
V
LOGIC
SCL
SDA
GND
–
+
U1
AD8565
3.5V < V
COM
< 4.5V
14.4V
VCC (~3.3V)
AD5259
MCU
C1
1
F
R5
10k
Ω
R6
10k
Ω
SUPPLIES POWER
TO BOTH THE
LOGIC SUPPLY OF
THE DIGITAL POT
Figure 47. 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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