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参数资料
| 型号： | AD5255BRU250-RL7 |
| 厂商： | ANALOG DEVICES INC |
| 元件分类： | 数字电位计 |
| 英文描述： | 3-Channel Digital Potentiometer with Nonvolatile Memory |
| 中文描述： | TRIPLE 250K DIGITAL POTENTIOMETER, INCREMENT/DECREMENT CONTROL INTERFACE, 512 POSITIONS, PDSO24 |
| 封装： | MO-153AD, TSSOP-24 |
| 文件页数： | 16/20页 |
| 文件大小： | 626K |
| 代理商： | AD5255BRU250-RL7 |
AD5255
USING ADDITIONAL INTERNAL
NONVOLATILE EEPROM
The AD5255 contains additional internal user EEPROM for
saving constants and other data. The user EEPROM I
2
C data
word follows the same format as the general-purpose EEPROM
memory shown in Figure 19 and Figure 20. User EEPROM
memory addresses are shown in Table 6.
Rev. 0 | Page 16 of 20
To support the use of multiple EEPROM modules on a single
I
2
C bus, the AD5255 features two external addressing pins, Pins
21 and 22 (A1_EE and A0_EE) to manually set the address of
the EEPROM included with the AD5255. This feature ensures
that the correct EEPROM memory is accessed when using
multiple memory modules on a single I
2
C bus.
DIGITAL INPUT/OUTPUT CONFIGURATION
All digital inputs are ESD protected. Digital inputs are high
impedance and can be driven directly from most digital sources.
The RESET digital input pin does not have an internal pull-up
resistor. Therefore, the user should place a pull-up resistor from
RESET to V
DD
if the function is not used. The WP pin has an
internal pull-down resistor. If not driven by an external source,
the AD5255 defaults to a write-protected state. ESD protection
of the digital inputs is shown in Figure 27.
WP
INPUTS
V
DD
GND
0
Figure 27. Equivalent WP ESD Protection
MULTIPLE DEVICES ON ONE BUS
Figure 28 shows four AD5255 devices on the same serial bus.
Each has a different slave address since the state of their AD0
and AD1 pins are different. This allows independent reading
and writing to each RDAC within each device.
+5V
R
P
R
P
MASTER
SDA
SDA
AD1
AD0
SCL
SDA
AD1
AD0
SCL
SDA
AD1
AD0
SCL
SDA
AD1
AD0
SCL
SCL
V
DD
V
DD
V
DD
0
Figure 28. Multiple AD5255 Devices on a Single Bus
LEVEL SHIFT FOR BIDIRECTIONAL
COMMUNICATION
While most legacy systems operate at one voltage, adding a new
component might require a different voltage. When two systems
transmit the same signal at two different voltages, use a level
shifter to allow the systems to communicate.
For example, a 3.3 V microcontroller (MCU) can be used along
with a 5 V digital potentiometer. A level shifter is required to
enable bidirectional communication.
Figure 29 shows one of many possible techniques to properly
level-shift signals between two devices. M1 and M2 are
N-channel FETs (2N7002). If V
DD
falls below 2.5 V, use low
threshold N-channel FETs (FDV301N) for M1 and M2.
V
DD1
= 3.3V
V
DD2
= 5V
SDA1
SCL1
SDA2
SCL2
R
P
R
P
R
P
R
P
G
G
S
S
D
D
M1
M2
3.3V
MCU
5V
AD5255
0
Figure 29. Level Shifting for Different Voltage Devices on an I
2
C Bus
TERMINAL VOLTAGE OPERATION RANGE
The AD5255 positive V
DD
and negative V
SS
power supply inputs
define the boundary conditions for proper 2-terminal
programmable resistance operation. Supply signals on terminals
W and B that exceed V
DD
or V
SS
are clamped by the internal
forward-biased diodes of the AD5255.
V
DD
V
SS
A
W
B
0
Figure 30. Maximum Terminal Voltages Set by V
DD
and V
SS
The ground pin of the AD5255 is used as a digital ground
reference, and needs to be tied to the common ground of the
PCB. Reference the digital input control signals to the AD5255
ground pin, and satisfy the logic levels defined in the
Specifications tables.
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相关代理商/技术参数 |
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| AD5255BRU25-RL7 | 制造商:Analog Devices 功能描述:DGTL POTENTIOMETER 512POS 25KOHM TRIPLE 24TSSOP - Tape and Reel |
| AD5255BRUZ25 | 制造商:Analog Devices 功能描述:Digital Potentiometer 512POS 25KOhm Triple 24-Pin TSSOP 制造商:Analog Devices 功能描述:DGTL POTENTIOMETER 512POS 25KOHM TRIPLE 24TSSOP - Rail/Tube 制造商:Analog Devices 功能描述:DIGIPOT I2C NV MEMORY 5K SMD 5255 |
| AD5255BRUZ250 | 制造商:Analog Devices 功能描述:Digital Potentiometer 512POS 250KOhm Triple 24-Pin TSSOP 制造商:Analog Devices 功能描述:DGTL POTENTIOMETER 512POS 250KOHM TRIPLE 24TSSOP - Rail/Tube 制造商:Analog Devices 功能描述:DIGIPOT I2C NV MEMORY 250K 5255 |
| AD52579 | 制造商:Analog Devices 功能描述: |
| AD5258 | 制造商:AD 制造商全称:Analog Devices 功能描述:Nonvolatile, I2C-Compatible 64-Position, Digital Potentiometer |
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