AD5282 Analog Devices, AD5282 Datasheet - Page 5

• Manufacturer Part Number: AD5282
• Description: +15V/ I2C Compatible Digital Potentiometers
• Manufacturer: Analog Devices

TABLE 2: AD5282 PIN Function Descriptions
Pin
1
2
3
4
5
6
7
8
Data of AD5280/AD5282 is accepted from the I
S
Where:
S = Start Condition
P = Stop Condition
A = Acknowledge
X = Don’t Care
AD1, AD0 = Package pin programmable address bits
Figure 2. Writing to the RDAC Register
REV PrE 12 MAR 02
Information contained in this Product Concept Data Sheet describes a product in the early definition stage. There is no guarantee that the information contained here will become a final
product in its present form. For latest information contact Walt Heinzer/Analog Devices, Santa Clara, CA. TEL [phone]; FAX [phone]; email; [e-mail]
START BY
MAS TER
SDA
SCL
0
Name
O1
A
W
B
V
SHDN
SCL
SDA
1
1
0
SDA
SCL
1
1
DD
1
Slave Address Byte
0
1
0
1
Slave Address Byte
1
FRAME 1
Description
Logic Output terminal O1
Resistor terminal A
Wiper terminal W
Resistor terminal B
Positive power supply, specified for
operation from +5 to +15V.
Active Low, Asynchronous connection of
the wiper W to terminal B, and open
circuit of terminal A. RDAC register
contents unchanged.
Serial Clock Input
Serial Data Input/Output
1
P
1
PRELIMINARY TECHNICAL DATA
A
D
1
t
AD1
1
AD0
S
A
D
0
R/W
t
2
R/
W W W W
ACK. BY
AD5280
9
1
1
1
A
t
3
A/B
1
2
C bus in the following serial format:
A A A A /
B
RS
t
8
Figure 1. Detail Timing Diagram
t
8
S D
R
S
O1
Instruction Byte
S
D
Instruction Byte
FRA ME 2
O2
R/W W W W = Read Enable at High and Write Enable at Low
A A A A /B = RDAC sub address select. “Zero” for RDAC1 and “One” for RDAC2
SD = Shutdown, same as SHDN pin operation except inverse logic
O2, O1 = Output logic pin latched values
D7,D6,D5,D4,D3,D2,D1,D0 = Data Bits
O
1
X
t
t
5
9
O
2
4
X
9
10
11
12
13
14
15
16
X
X
ACK. BY
AD5280
9
X
t
5
D7
1
AD0
AD1
GND
V
V
B
W
A
2
SS
L
2
X
2
D6
A
D5
Sr
t
D4
7
D
7
FRAME 3
Data B yte
t
Programmable address bit for multiple
package decoding. Bits AD0 & AD1
provide 4 possible addresses.
Programmable address bit for multiple
package decoding. Bits AD0 & AD1
provide 4 possible addresses.
Common Ground
Negative power supply, specified for
operation from 0 to -5V
Logic Supply Voltage, needs to be same
voltage as the digital logic controlling the
AD5282.
Resistor terminal B
Wiper terminal W
Resistor terminal A
6
D3
D
6
AD5280/AD5282
D2
D
5
D1
Data Byte
D
4
D0
ACK. BY
AD5280
9
D
3
2
2
2
D
2
P
D
1
t
10
D
0
A
P