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AD5280 데이터시트(PDF) 6 Page - Analog Devices

부품명 AD5280
상세설명  15V, I2C Compatible Digital Potentiometers
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제조업체  AD [Analog Devices]
홈페이지  http://www.analog.com
Logo AD - Analog Devices

AD5280 데이터시트(HTML) 6 Page - Analog Devices

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PRELIMINARY TECHNICAL DATA
AD5280/AD5282
6
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 408 382-3107; FAX 408 382-2721; email; walt.heinzer@analog.com
SCL
SDA
1
9
1
0
1
1
0
AD0
AD1
R/
W
ACK. BY
AD5280
19
D7
D6
D5
D3
D4
D0
D1
D2
NO ACK.
BY MASTER
FRAME 1
Slave Address Byte
START BY
MASTER
FRAME 2
Data From Select ed
RDAC Regis ter
STO P BY
MASTER
Figure 3. Reading Data from a Previously Selected RDAC Register
OPERATION
The AD5280/AD5282 provides a single/dual channel, 256-
position digitally-controlled variable resistor (VR) device. The
terms VR and RDAC are used interchangeably throughout this
documentation. To program the VR settings, refer to the Digital
Interface section. Both parts have an internal power ON preset
that places the wiper in mid scale during power on, which
simplifies the fault condition recovery at power up. In addition,
the shutdown
SHDN pin of AD5280/AD5282 places the RDAC
in a zero power consumption state where terminal A is open
circuited and the wiper W is connected to terminal B, resulting
in only leakage currents being consumed in the VR structure. In
shutdown mode the VR latch settings are maintained, so that,
returning to operational mode from power shutdown, the VR
settings return to their previous resistance values.
RS
D5
D4
D3
D2
D1
D0
RDAC
LATCH
&
DECODER
SHDN
Ax
Bx
Wx
RS
RS
RS
D6
D7
Figure 4. AD5280/AD5282 Equivalent RDAC Circuit
PROGRAMMING THE VARIABLE RESISTOR
Rheostat Operation
The nominal resistance of the RDAC between terminals A and B
are available in 20K
Ω, 50KΩ, and 200KΩ. The final three
digits of the part number determine the nominal resistance
value, e.g. 20K
Ω = 20; 50KΩ = 50; 200KΩ = 200. The
nominal resistance (RAB) of the VR has 256 contact points
accessed by the wiper terminal, plus the B terminal contact. The
eight bit data in the RDAC latch is decoded to select one of the
256 possible settings. Assume a 20K
Ω part is used, the wiper's
first connection starts at the B terminal for data 00H. Since there
is a 60
Ω wiper contact resistance, such connection yields a
minimum of 60
Ω resistance between terminals W and B. The
second connection is the first tap point corresponds to 138
(RWB = RAB/256 + RW = 78Ω+60Ω) for data 01H. The third
connection is the next tap point representing 216
Ω (78x2+60)
for data 02H and so on. Each LSB data value increase moves the
wiper up the resistor ladder until the last tap point is reached at
19982
Ω [R
AB
–1LSB+RW]. The wiper does not directly connect
to the B terminal. See Figure 4 for a simplified diagram of the
equivalent RDAC circuit.
The general equation determining the digitally programmed
output resistance between W and B is:
1
eqn.
256
)
(
W
AB
WB
R
R
D
D
R
+
=
where D is the decimal equivalent of the binary code which is
loaded in the 8-bit RDAC register, and RAB is the nominal end-
to-end resistance.
For example, RAB=20K
Ω, when V
B = 0V and A–terminal is open
circuit, the following output resistance values RWB will be set for
the following RDAC latch codes. Result will be the same if
terminal A is tied to W:
D
RWB
Output State
(DEC)
(
Ω)
256
19982
Ω Full-Scale (R
AB
- 1LSB + RW)
128
10060
Ω Mid-Scale
1
138
1 LSB
0
60
Zero-Scale (Wiper contact resistance)
Note that in the zero-scale condition a finite wiper resistance of
60
Ω is present. Care should be taken to limit the current flow
between W and B in this state to a maximum current of no more
than 5mA. Otherwise, degradation or possible destruction of the
internal switch contact can occur.
Similar to the mechanical potentiometer, the resistance of the
RDAC between the wiper W and terminal A also produces a
digitally controlled resistance RWA. When these terminals are
used the B–terminal should be let open or tied to the wiper
terminal. Setting the resistance value for RWA starts at a
maximum value of resistance and decreases as the data loaded in
the latch is increased in value. The general equation for this
operation is:
2
eqn.
256
256
)
(
W
AB
WA
R
R
D
D
R
+
=


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