|
|
PDF CAT5171 Data sheet ( Hoja de datos )
| Número de pieza | CAT5171 | |
| Descripción | 256-position I2C Compatible Digital Potentiometer | |
| Fabricantes | ON Semiconductor | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de CAT5171 (archivo pdf) en la parte inferior de esta página. Total 12 Páginas | ||
|
No Preview Available !
CAT5171
256‐position I2C Compatible
Digital Potentiometer (POT)
The CA5171 is a 256-position digital 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 reset the wiper position to midscale or to go to a
shutdown state during operation. An address input pin, AD0, allows
the connection of two devices onto the same I2C bus.
The CAT5171 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 CAT5171 ideal for battery-powered portable
applications.
The CAT5171, designed as a pin for pin replacement for the
AD5245, is offered in the 8-lead SOT23 package and operates over the
−40C to +85C industrial temperature range.
Features
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
SOT−23 8-lead (2.9 mm 3 mm) Package
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
http://onsemi.com
SOT23−8
TP, TB SUFFIX
CASE 527AK
MARKING DIAGRAM
AFYM
AGYM
11
AF = 50 kW
AG = 100 kW
Y = Production Year
Y = (Last Digit)
M = Production Month
M = (1 − 9, A, B, C)
PIN CONNECTIONS
W
VDD
GND
SCL
1
(Top View)
A
B
AD0
SDA
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 2 of this data sheet.
Semiconductor Components Industries, LLC, 2013
July, 2013 − Rev. 2
1
Publication Order Number:
CAT5171/D
1 page  
CAT5171
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
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 4. 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 5. Wiper Voltage
260
400
350
300
250
200
150
100
2
T = 90C
T = −45C
T = 25C
345
VDD (V)
Figure 6. Standby Current
6
http://onsemi.com
5
5 Page 
CAT5171
INSTRUCTION AND REGISTER DESCRIPTION
Slave Address Byte
The first byte sent to the CAT5171 from the
master/processor is called the Slave Address Byte. The most
significant six bits of the slave address are a device type
identifier. For the CAT5171, these bits are fixed at 010110.
The next bit, AD0, is the first bit of the internal slave
address and must match the physical device address which
is defined by the state of the AD0 input pin for the CAT5171
to successfully continue the command sequence. Only the
device which slave address matches the incoming device
address sent by the master executes the instruction. The AD0
input can be actively driven by CMOS input signals or tied
to the supply voltage or ground.
The next bit, R/W, indicates whether this command
corresponds to a Write or Read instruction. To write into the
Wiper control register, R/W bit is set to a logic low; while a
read from the wiper register is done with the bit high.
Wiper Control
The CAT5171 contains one 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 Register is a volatile register that loses
its contents when the CAT5171 is powered-down. Upon
power-up, the wiper is set to midscale and may be
repositioned anytime after the power has become stable.
Instructions
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.
In write mode, the second byte is the instruction byte. The
first bit (MSB) of the instruction byte is a don’t care. The
second MSB, RS, is the midscale reset. A logic high on this
bit moves the wiper to the center tap. The third MSB, SD, is
a shutdown bit. A logic high causes an open circuit at
terminal A, and short 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.
Two CAT5171 on a Single Bus
When needed, it is possible to connect two CAT5171
potentiometers on the same I2C bus and be able to address
each one independently. Each device can be set to a unique
address by using the AD0 input pin. One device AD0 pin is
connected to ground, and the other device AD0 pin is tied to
the supply voltage.
Table 11. Write
S 0 1 0 1 1 0 AD0 W A X RS SD 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 0 AD0 R/W X RS SD X X X X X
D7 D6 D5 D4 D3 D2 D1 D0
RSAT
T
Slave Address Byte
ACK
Instruction Byte
CAK
Data Byte
CAK OST
P
Table 12. READ
S 0 1 0 1 1 0 AD0 R A D7 D6 D5 D4 D3 D2 D1 D0
Slave Address Byte
Data Byte
A
P
SDA
RSAT
T
0 1 0 1 1 0 AD0 R/W
Slave Address Byte
ACK
D7
Legend
S = Start
P = Stop
A = Acknowledge
AD0 = Address bit 0, needed when using two
potentiometers on the same I2C bus.
D = Data bit
R = Read (bit is 1 for Read instruction)
D6
D5 D4 D3 D2 D1 D0
Data Byte
N
CKA
OPST
W = Write (bit is 0 for Write instruction)
RS = When the bit is 1, the wiper position is moved
to mid-scale 0x80
SD = Shut Down:
0: normal operation
1: wiper is parked at B terminal and terminal A
is open circuit.
X = Don’t Care
http://onsemi.com
11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet CAT5171.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| CAT5171 | 256-position I2C Compatible Digital Potentiometer | ON Semiconductor |
| CAT5172 | 256-position SPI Compatible Digital Potentiometer | ON Semiconductor |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |