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AD5251BRU10 Datasheet(PDF) 9 Page - Analog Devices

No. de pieza AD5251BRU10
Descripción Electrónicos  Dual 64-and 256-Position I2C Nonvolatile Memory Digital Potentiometers
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Fabricante Electrónico  AD [Analog Devices]
Página de inicio  http://www.analog.com
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AD5251BRU10 Datasheet(HTML) 9 Page - Analog Devices

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AD5251/AD5252
Rev. 0 | Page 9 of 28
PIN CONFIGURATION AND FUNCTION DESCRIPTION
1
2
3
4
5
6
7
AD0
WP
W1
SDA
A1
B1
VDD
14
13
12
11
10
9
8
B3
A3
AD1
VSS
SCL
DGND
W3
AD5251/
AD5252
TOP VIEW
(Not to Scale)
Figure 2. AD5251/AD5252 in TSSOP-14
Table 5. Pin Function Descriptions
Pin No.
Mnemonic
Description
1
VDD
Positive Power Supply Pin. Connect +2.7 V to +5 V for single supply or ±2.7 V for dual supply,
where VDD – VSS ≤ 5.5 V. VDD must be able to source 35 mA for 26 ms when storing data to
EEMEM.
2
AD0
I2C Device Address 0. AD0 and AD1 allow four AD5251/AD5252s to be addressed.
3
WP
Write Protect, Active Low. VWP ≤ VDD + 0.3 V.
4
W1
Wiper Terminal of RDAC1. VSS ≤ VW1 ≤ VDD.1
5
B1
B Terminal of RDAC1. VSS ≤ VB1 ≤ VDD.1
6
A1
A Terminal of RDAC1. VSS ≤ VA1 ≤ VDD.1
7
SDA
Serial Data Input/Output Pin. Shifts in one bit at a time on positive clock edges. MSB loaded
first. Open-drain MOSFET requires pull-up resistor.
8
VSS
Negative Supply. Connect to 0 V for single supply or –2.7 V for dual supply, where VDD – VSS
+5.5 V. If VSS is used, other than grounded, in dual supply, VSS must be able to sink 35 mA for
26 ms when storing data to EEMEM.
9
SCL
Serial Input Register Clock Pin. Shifts in one bit at a time on positive clock edges. VSCL
(VDD + 0.3 V). Pull-up resistor is recommended for SCL to ensure minimum power.
10
DGND
Digital Ground. Connect to system analog ground at a single point.
11
AD1
I2C Device Address 1. AD0 and AD1 allow four AD5251/AD5252s to be addressed.
12
A3
A Terminal of RDAC3. VSS ≤ VA3 ≤ VDD.1
13
B3
B Terminal of RDAC3. VSS ≤ VB3 ≤ VDD.1
14
W3
W Terminal of RDAC3. VSS ≤ VW3 ≤ VDD.1
1 For quad-channel device software compatibility, the dual potentiometers in the parts are designated as RDAC1 and RDAC3.
I2C INTERFACE TIMING DIAGRAM
t1
SCL
SDA
PS
P
t3
t2
t8
t9
t8
t9
t4
t5
t7
t6
t10
Figure 3. I2C Timing Diagram


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