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PDF CAT5271 Data sheet ( Hoja de datos )
| Número de pieza | CAT5271 | |
| Descripción | dual 256-position digitally programmable linear taper potentiometer ideally suited | |
| Fabricantes | ON Semiconductor | |
| Logotipo |  |
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CAT5271
Dual 256-Position I2C
Compatible Digital
Potentiometer
The CAT5271 is a dual 256−position digitally programmable linear
taper potentiometer ideally suited for replacing mechanical
potentiometers and variable resistors.
The wiper settings are controlled through an I2C−compatible digital
interface. Upon power−up, the wiper assumes a midscale position and
may be repositioned anytime after the power is stable. The device can
be programmed to go to a shutdown state during operation.
The CAT5271 operates from 2.7 V to 5.5 V, while consuming less
than 2 mA. This low operating current, combined with a small package
footprint, makes the CAT5271 ideal for battery−powered portable
applications.
The CAT5271, designed as a pin for pin replacement for the
AD5243, is offered in the 10−lead MSOP package and operates over
the −40°C to +85°C industrial temperature range.
Features
• Dual 256−position
• End−to−End Resistance: 50 kW, 100 kW
• I2C Compatible Interface
• Power−on Preset to Midscale
• Single Supply 2.7 V to 5.5 V
• Low Temperature Coefficient 100 ppm/°C
• Low Power, IDD 2 mA max
• Wide Operating Temperature −40°C to +85°C
• RoHS−compliant MSOP−10 Package (3 mm x 4.9 mm)
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Typical Applications
• Potentiometer Replacement
• Transducer Adjustment of Pressure, Temperature, Position,
Chemical, and Optical Sensors
• RF Amplifier Biasing
• Gain Control and Offset Adjustment
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MSOP−10
R, Z SUFFIX
CASE 846AE
MARKING DIAGRAM
ANCC
YMR
ANCE
YMR
11
ANCC = 50 kW
ANCE = 100 kW
Y = Production Year
Y = (Last Digit)
M = Production Month
M = (1 − 9, A, B, C)
R = Revision
B1
A1
W2
GND
VDD
PIN CONNECTIONS
1
(Top View)
W1
B2
A2
SDA
SCL
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 2 of this data sheet.
© Semiconductor Components Industries, LLC, 2009
September, 2009 − Rev. 1
1
Publication Order Number:
CAT5271/D
1 page  
CAT5271
0.03
0.02
0.01
0
−0.01
−0.02
−0.03
−0.04
−0.05
0
TYPICAL CHARACTERISTICS
0.1
DNL
0
−0.1 INL
−0.2
−0.3
32 64 96 128 160 192 224
TAP
Figure 2. Differential Non−Linearity,
VDD = 5.6 V
256
−0.4
−0.5
0
32 64 96 128 160 192 224 256
TAP
Figure 3. Integral Non−Linearity,
VDD = 5.6 V
120
100
VDD = 2.6 V
80
60
3.3 V
40
20
4.0 V
5.6 V
0
0 50 100 150 200
TAP
Figure 4. Wiper Resistance at Room
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Temperature
250
6
5
4
3
2
1
0
0
5.6 V
5.0 V
4.0 V
3.3 V
VDD = 2.6 V
52 104 156 208
TAP
Figure 5. Wiper Voltage
260
400
350
300
250
200
150
100
2
T = 90°C
T = −45°C
T = 25°C
345
VDD (V)
Figure 6. Standby Current
6
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5
5 Page 
CAT5271
INSTRUCTION AND REGISTER DESCRIPTION
SLAVE ADDRESS BYTE
The first byte sent to the CAT5271 from the master/processor
is called the Slave Address Byte. The most significant seven
bits of the slave address are a device type identifier. For the
CAT5271, these bits are fixed at 0101111. The following bit
(R/W) selects between a Read or a Write operation. If the bit
is logic high, then a Read instruction is performed. If the bit
is low, then the Write command is executed.
INSTRUCTION BYTE
Write and Read instructions are respectively three and two
bytes in length. The basic sequence of the two instructions
is illustrated in Table 11 and 12.
Write Operation
In the write instruction, the second byte first bit (A0)
selects between the potentiometer 1 and 2: a logic low is for
the potentiometer 1, and a logic high is for potentiometer 2.
The following bit (SD) is the shutdown bit. A logic high
causes an open circuit at terminal A while shorting the wiper
terminal W to terminal B. The “shutdown” operation does
not change the contents of the wiper register. When the
shutdown bit, SD, goes back to a logic low, the previous
wiper position is restored. Also during shutdown, new
settings can be programmed. As soon as the device is
returned from shutdown, the wiper position is set according
to the wiper register value.
The remainder of the bits in the instruction byte are don’t
care bits.
Read Operation
In the read mode, the data byte follows immediately after
the acknowledgment of the slave address byte. Data is
transmitted over the serial bus in sequences.
There is no potentiometer channel selection bit in the
Read command. The addressed channel is the one that is
previously selected in the write mode. If it desired to read the
potentiometer wiper register values of both channels, the
first potentiometer must be addressed in write mode and
then change to read mode to read the first channel value.
After that, the user must return the device to write mode with
the second potentiometer selected and read the second
potentiometer wiper register value in read mode. It is not
necessary for users to issue the third data byte in write mode
for subsequent read operation.
Wiper Control
The CAT5271 contains two 8−bit Wiper Control Register
(WCR). The Wiper Control Register output is decoded to
select one of 256 switches along its resistor array. The
contents of the WCR may be written by the host via Write
instruction.
The Wiper Control Registers are a volatile register that
loses its contents when the CAT5271 is powered−down.
Upon power−up, the wiper is set to midscale and may be
repositioned anytime after the power has become stable.
Table 11. Write
S 0 1 0 1 1 1 1 W A A0 SD X X X X X X A D7 D6 D5 D4 D3 D2 D1 D0 A P
Slave Address Byte
Instruction Byte
Data Byte
SDA
0 1 0 1 1 1 1 R/W
A0 SD X X X X X X
D7 D6 D5 D4 D3 D2 D1 D0
www.DataRSATTSheet4U.cSomlave Address Byte
ACK
Instruction Byte
CAK
Data Byte
CAK OSPT
Table 12. READ
S 0 1 0 1 1 1 1 R A D7 D6 D5 D4 D3 D2 D1 D0
Slave Address Byte
Data Byte
A
P
SDA
0 1 0 1 1 1 1 R/W
D7
ST
RA
T
Legend
S=
Slave Address Byte
Start
CA
K
P = Stop
A = Acknowledge
D = Data bit
R = Read (bit is 1 for Read instruction)
W = Write (bit is 0 for Write instruction)
D6 D5
D4 D3 D2 D1 D0
Data Byte
N
CKA
ST
O
P
A0 = Potentiometer Channel (1 or 2) Select Bit
SD = Shut Down:
0: normal operation
1: wiper is parked at B terminal and terminal A
is open circuit.
X = Don’t Care
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11
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| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet CAT5271.PDF ] | |
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