X9428 Potentiometer Datasheet

X9428 Datasheet, PDF, Equivalent


Part Number

X9428

Description

Single Digitally Controlled Potentiometer

Manufacture

Xicor

Total Page 20 Pages
Datasheet
Download X9428 Datasheet


X9428
APPLICATION NOTES
AVAILABLE
AN99 • AN115 • AN120 • AN124 • AN133 • AN134 • AN135
Low Noise/Low Power/2-Wire Bus
X9428
Single Digitally Controlled Potentiometer (XDCP)
FEATURES
• Solid state potentiometer
• 2-wire serial interface
• Register oriented format
—Direct Read/Write/Transfer Wiper Position
—Store as many as Four Positions per
Potentiometer
• Power supplies
—VCC = 2.7V to 5.5V
—V+ = 2.7V to 5.5V
—V– = –2.7V to –5.5V
• Low power CMOS
—Standby current < 1µA
—Ideal for Battery Operated Applications
• High reliability
—Endurance–100,000 Data Changes per Bit per
Register
—Register Data Retention–100 years
• 4-bytes of nonvolatile memory
• 10K Ohm resistor array
• Resolution: 64 taps each potentiometer
• SOIC and TSSOP packages
DESCRIPTION
The X9428 integrates a digitally controlled
potentiometers (XDCP) on a monolithic CMOS
integrated microcircuit.
The digitally controlled potentiometer is implemented
using 63 resistive elements in a series array. Between
each element are tap points connected to the wiper
terminal through switches. The position of the wiper on
the array is controlled by the user through the 2-wire
bus interface. Each potentiometer has associated with
it a volatile Wiper Counter Register (WCR) and 4
nonvolatile Data Registers (DR0:DR3) that can be
directly written to and read by the user. The contents of
the WCR controls the position of the wiper on the
resistor array through the switches. Power up recalls
the contents of DR0 to the WCR.
The XDCP can be used as a three-terminal
potentiometer or as a two-terminal variable resistor in
a wide variety of applications including control,
parameter adjustments, and signal processing.
BLOCK DIAGRAM
VCC
VSS
V+
V–
SCL
SDA
A0
A2
A3
WP
Interface
and
Control
Circuitry
8
Data
R0 R1
R2 R3
Wiper
Counter
Register
(WCR)
VH/RH
VL/RL
VW/RW
REV 1.1.5 7/8/03
www.xicor.com
Characteristics subject to change without notice. 1 of 20

X9428
X9428
PIN DESCRIPTIONS
Host Interface Pins
Serial Clock (SCL)
The SCL input is used to clock data into and out of the
X9428.
Serial Data (SDA)
SDA is a bidirectional pin used to transfer data into and
out of the device. It is an open drain output and may be
wire-ORed with any number of open drain or open
collector outputs. An open drain output requires the
use of a pull-up resistor. For selecting typical values,
refer to the guidelines for calculating typical values on
the bus pull-up resistors graph.
Device Address (A0, A2, A3)
The Address inputs are used to set the least significant
3 bits of the 8-bit slave address. A match in the slave
address serial data stream must be made with the
Address input in order to initiate communication with
the X9428. A maximum of 8 devices may occupy the
2-wire serial bus.
Potentiometer Pins
RH/VH, RL/VL
The RH/VH and RL/VL inputs are equivalent to the
terminal connections on either end of a mechanical
potentiometer.
RW/VW
The wiper outputs are equivalent to the wiper output of
a mechanical potentiometer.
Hardware Write Protect Input WP
The WP pin when low prevents nonvolatile writes to the
Data Registers.
Analog Supply V+, V-
The Analog Supply V+, V- are the supply voltages for
the XDCP analog section.
PIN CONFIGURATION
VCC
A2
RL/VL
RH/VH
RW/VW
SDA
WP
VSS
DIP/SOIC
1 16
2 15
3 14
4 X9428 13
5 12
6 11
7 10
89
V+
NC
A0
NC
A3
SCL
NC
V–
A2
RL
RH
RW
SDA
WP
VSS
TSSOP
1 14
2 13
3 12
4 X9428 11
5 10
69
78
VCC
V+
A0
NC
A3
SCL
V–
PIN NAMES
Symbol
SCL
SDA
A0, A2, A3
RH/VH, VL/RH
RW/VW
WP
V+,V-
VCC
VSS
NC
Description
Serial clock
Serial data
Device address
Potentiometer Pins
(terminal equivalent)
Potentiometer Pin (wiper equivalent)
Hardware write protection
Analog and voltage follower
System supply voltage
System ground
No connection
REV 1.1.5 7/8/03
www.xicor.com
Characteristics subject to change without notice. 2 of 20


Features APPLICATION NOTES A V A I L A B L E AN99 • AN115 • AN120 • AN124 • AN13 3 • AN134 • AN135 Low Noise/Low Po wer/2-Wire Bus X9428 Single Digitally Controlled Potentiometer (XDCP™) FEAT URES • Solid state potentiometer • 2-wire serial interface • Register or iented format —Direct Read/Write/Tran sfer Wiper Position —Store as many as Four Positions per Potentiometer • P ower supplies —VCC = 2.7V to 5.5V — V+ = 2.7V to 5.5V —V– = –2.7V to –5.5V • Low power CMOS —Standby c urrent < 1µA —Ideal for Battery Oper ated Applications • High reliability —Endurance–100,000 Data Changes per Bit per Register —Register Data Rete ntion–100 years • 4-bytes of nonvol atile memory • 10K Ohm resistor array • Resolution: 64 taps each potentiom eter • SOIC and TSSOP packages DESCRI PTION The X9428 integrates a digitally controlled potentiometers (XDCP) on a m onolithic CMOS integrated microcircuit. The digitally controlled potentiometer is implemented using 63 resistive elements in a series array. Between each element are.
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