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CAT5221YI10 Datasheet(PDF) 2 Page - ON Semiconductor

No. de pieza CAT5221YI10
Descripción Electrónicos  Dual Digitally Programmable Potentiometer (DPP?? with 64 Taps and I2C Interface
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Fabricante Electrónico  ONSEMI [ON Semiconductor]
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CAT5221YI10 Datasheet(HTML) 2 Page - ON Semiconductor

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CAT5221
Doc. No. MD-2113 Rev. M
2
© 2009 SCILLC. All rights reserved.
Characteristics subject to change without notice
PIN DESCRIPTION
Pin (SOIC)
Name
Function
1
RW0
Wiper Terminal for Potentiometer 0
2
RL0
Low Reference Terminal for Potentiometer 0
3
RH0
High Reference Terminal for Potentiometer 0
4
A0
Device Address, LSB
5
A2
Device Address
6
RW1
Wiper Terminal for Potentiometer 1
7
RL1
Low Reference Terminal for Potentiometer 1
8
RH1
High Reference Terminal for Potentiometer 1
9
SDA
Serial Data Input/Output
10
GND
Ground
11
NC
No Connect
12
NC
No Connect
13
NC
No Connect
14
SCL
Bus Serial Clock
15
A3
Device Address
16
A1
Device Address
17
NC
No Connect
18
NC
No Connect
19
NC
No Connect
20
VCC
Supply Voltage
PIN DESCRIPTION
SCL: Serial Clock
The CAT5221 serial clock input pin is used to clock
all data transfers into or out of the device.
SDA: Serial Data
The CAT5221 bidirectional serial data pin is used to
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 outputs.
A0, A1, A2, A3: Device Address Inputs
These inputs set the device address when
addressing 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
CAT5221.
RH, RL: Resistor End Points
The two sets of RH and RL pins are equivalent to the
terminal connections on a mechanical potentiometer.
RW: Wiper
The two RW pins are equivalent to the wiper terminal
of a mechanical potentiometer.
DEVICE OPERATION
The CAT5221 is two resistor arrays integrated with I
2C
serial interface logic, two 6-bit wiper control registers
and eight 6-bit, non-volatile memory data registers.
Each resistor array contains 63 separate resistive
elements connected in series. The physical ends of
each array are equivalent to the fixed terminals of a
mechanical potentiometer (RH and RL). RH and RL are
symmetrical and may be interchanged. The tap
positions between and at the ends of the series resis–
tors are connected to the output wiper terminals (RW) by
a CMOS transistor switch. Only 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
registers or the non-volatile memory data registers via
the I
2C bus. Additional instructions allow data to be
transferred between the wiper control registers and
each respective potentiometer's non-volatile data
registers. Also, the device can be instructed to operate
in an "increment/decrement" mode.


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