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PDF CAT5273 Data sheet ( Hoja de datos )
| Número de pieza | CAT5273 | |
| Descripción | Dual 256-position I2C Compatible Digital Potentiometers | |
| Fabricantes | ON Semiconductor | |
| Logotipo |  |
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CAT5271, CAT5273
Dual 256‐position I2C
Compatible Digital
Potentiometers (POTs)
The CAT5271 and CAT5273 are dual 256-position digital
programmable linear taper potentiometers 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 devices can
be programmed to go to a shutdown state during operation.
The CAT5271 and CAT5273 operate 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 them ideal for battery-powered
portable applications.
The CAT5271 and CAT5273, designed as pin for pin replacements
for the AD5243 and AD5248, are offered in the 10-lead MSOP
package and operate over the −40C to +85C 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 −40C to +85C
MSOP−10 Package (3 mm 4.9 mm)
These Devices are Pb-Free, Halogen Free/BFR Free and are
RoHS Compliant
Typical Applications
Potentiometer Replacement
Transducer Adjustment of Pressure, Temperature, Position,
Chemical, and Optical Sensors
RF Amplifier Biasing
Gain Control and Offset Adjustment
*Two address decode pins (CAT5273 only) allowing
multiple devices on the same bus
Semiconductor Components Industries, LLC, 2013
July, 2013 − Rev. 3
1
http://onsemi.com
MSOP−10
Z SUFFIX
CASE 846AE
MARKING DIAGRAMS
ANCC
YMR
ANCE
YMR
PAYM
LXX
11 1
ANCC = CAT5721 − 50 kW
ANCE = CAT5721 − 100 kW
PA = CAT5273 − 50 kW*
Y = Production Year (Last Digit)
M = Production Month (1−9, O, N, D)
R = Revision
L = Assembly Location
XX = Last Two Digits of Assembly Lot Number
*Contact factory for availability of CAT5273 − 100 kW
B1
A1
W2
GND
VDD
PIN CONNECTIONS
1
CAT5271
W1
B2
A2
SDA
SCL
B1
AD0
W2
GND
VDD
1
CAT5273
(Top Views)
W1
B2
AD1
SDA
SCL
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 12 of this data sheet.
Publication Order Number:
CAT5271/D
1 page  
CAT5271, CAT5273
TYPICAL CHARACTERISTICS
0.03
0.02
DNL
0.01
0
−0.01
−0.02
−0.03
−0.04
−0.05
0 32 64 96 128 160 192 224 256
TAP
Figure 3. Potentiometer Divider Differential
Non-linearity, VDD = 5.6 V
0.1
0
−0.1 INL
−0.2
−0.3
−0.4
−0.5
0
32 64 96 128 160 192 224 256
TAP
Figure 4. Potentiometer Divider Integral
Non-linearity, VDD = 5.6 V
0.10
0.08
0.06
0.04
0.02
0
−0.02
−0.04
0 32 64 96 128 160 192 224 256
TAP
Figure 5. Rheostat Differential Non-linearity,
VDD = 5.6 V
0.16
0.14
0.12
0.10
0.08
0.06
0.04
0.02
0
−0.02
−0.04
0
32 64 96 128 160 192 224 256
TAP
Figure 6. Rheostat Integral Non-linearity,
VDD = 5.6 V
120
100
80
60
40
20
0
0
VDD = 2.6 V
3.3 V
4.0 V
5.6 V
50 100 150 200
TAP
Figure 7. Wiper Resistance at Room
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 8. Wiper Voltage
260
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5
5 Page 
CAT5271, CAT5273
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. For CAT5273, the
first five bits are fixed as 01011, and the next two bits of the
device identifier are determined by the logic levels on the
AD1 and AD0 pins. 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 10 and 11.
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/CAT5273 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/CAT5273 is
powered-down. Upon power-up, the wiper is set to midscale
and may be repositioned anytime after the power has
become stable.
Table 10. CAT5271 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
S
RAT
T
Slave Address Byte
ACK
Instruction Byte
CAK
Data Byte
CKA OSPT
Table 11. CAT5271 READ
S
0 1 0 1 1 1 1 R A D7 D6 D5 D4 D3 D2 D1 D0
A
Slave Address Byte
Data Byte
P
SDA
RSAT
T
Legend
S=
P=
A=
D=
R=
W=
0 1 0 1 1 1 1 R/W
Slave Address Byte
CAK
D7
D6
Start
Stop
Acknowledge
Data bit
Read (bit is 1 for Read instruction)
Write (bit is 0 for Write instruction)
D5 D4 D3 D2 D1 D0
Data Byte
N
CKA
OPST
A0 =
SD =
X=
Potentiometer Channel (1 or 2) Select Bit
Shut Down:
0: normal operation
1: wiper is parked at B terminal and
terminal A is open circuit.
Don’t Care
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11
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet CAT5273.PDF ] | |
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