cat5270 ON Semiconductor, cat5270 Datasheet - Page 2

• Manufacturer Part Number: cat5270
• Description: Dual Digitally Programmable Potentiometers Dpp With 256 Taps & I2c Compatible Interface
• Manufacturer: ON Semiconductor

Pin Description
SCL: Serial Clock
data transfers into or out of the device.
SDA: Serial Data
transfer data into and out of the device. The SDA pin is an
open drain output and can be wire−OR’d with the other open
drain or open collector I/Os.
A0, A1, A2, A3: Device Address Inputs
multiple devices. A total of sixteen devices can be addressed
on a single bus. A match in the slave address must be made
with the address input in order to initiate communication
with the CAT5270.
R
terminal connections on a mechanical potentiometer.
R
mechanical potentiometer.
Device Operation
compatible interface and two 8−bit wiper control registers.
Each resistor array contains 255 separate resistive elements
connected in series. The physical ends of each array are
equivalent to the fixed terminals of a mechanical
potentiometer (R
at the ends of the series resistors are connected to the output
H
W
The CAT5270 serial clock input pin is used to clock all
The CAT5270 bidirectional serial data pin is used to
These inputs set the device address when addressing
The two sets of R
The R
The CAT5270 is two resistor arrays integrated with an I
, R
: Wiper
L
: Resistor End Points
W
pins are equivalent to the wiper terminal of a
H
and R
H
and R
L
). The tap positions between and
L
pins are equivalent to the
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2
C
2
wiper terminals (R
one tap point for each potentiometer is connected to its wiper
terminal at a time and is determined by the value of the wiper
control register. Data can be read or written to the wiper
control register via the I
device can be instructed to operate in an “increment/
decrement” mode.
Table 1. PIN DESCRIPTION
TSSOP−14
Pin #
10
12
13
14
11
1
2
3
4
5
6
7
8
9
Name
GND
SDA
R
R
SCL
V
R
R
R
R
A0
A2
A1
A3
CC
W0
W1
H0
H1
L0
L1
W
) by a CMOS transistor switch. Only
Device Address, LSB
Supply Voltage
Low Reference Terminal for
Potentiometer 0
High Reference Terminal for
Potentiometer 0
Wiper Terminal for Potentiometer 0
Device Address
Serial Data Input/Output
Device Address
Low Reference Terminal for
Potentiometer 1
High Reference Terminal for
Potentiometer 1
Wiper Terminal for Potentiometer 1
Ground
Bus Serial Clock
Device Address
2
C compatible interface. Also, the
Function