X9420 Potentiometer Datasheet

X9420 Datasheet, PDF, Equivalent


Part Number

X9420

Description

Single Digitally Controlled (XDCP) Potentiometer

Manufacture

Xicor

Total Page 20 Pages
Datasheet
Download X9420 Datasheet


X9420
APPLICATION NOTES
AVAILABLE
AN99 • AN115 • AN120 • AN124 • AN133 • AN134 • AN135
Low Noise/Low Power/SPI Bus
X9420
Single Digitally Controlled (XDCP) Potentiometer
FEATURES
• Solid-State Potentiometer
• SPI serial interface
• Register oriented format
—Direct read/write/transfer wiper positions
—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
• High reliability
—Endurance–100,000 data changes per bit per
register
—Register data retention–100 years
• 8-bytes of nonvolatile EEPROM memory
• 10Kor 2.5Kresistor arrays
• Resolution: 64 taps each pot
• 14-lead TSSOP, 16-lead SOIC, and 16-pin plastic
DIP packages
DESCRIPTION
The X9420 integrates a single 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 SPI bus
interface. The 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
HOLD
CS
SCK
S0
SI
A0
Interface
and
Control
Circuitry
8
Data
R0 R1
R2 R3
Wiper
Counter
Register
(WCR)
VH/RH
VL/RL
VW/RW
REV 1.1.6 7/30/02
www.xicor.com
Characteristics subject to change without notice. 1 of 20

X9420
X9420
PIN DESCRIPTIONS
Host Interface Pins
Serial Output (SO)
SO is a push/pull serial data output pin. During a read
cycle, data is shifted out on this pin. Data is clocked out
by the falling edge of the serial clock.
Serial Input
SI is the serial data input pin. All opcodes, byte
addresses and data to be written to the potentiometer
and pot register are input on this pin. Data is latched by
the rising edge of the serial clock.
Serial Clock (SCK)
The SCK input is used to clock data into and out of the
X9420.
Chip Select (CS)
When CS is HIGH, the X9420 is deselected and the
SO pin is at high impedance, and (unless an internal
write cycle is underway) the device will be in the
standby state. CS LOW enables the X9420, placing it
in the active power mode. It should be noted that after
a power-up, a HIGH to LOW transition on CS is
required prior to the start of any operation.
Hold (HOLD)
HOLD is used in conjunction with the CS pin to select
the device. Once the part is selected and a serial
sequence is underway, HOLD may be used to pause
the serial communication with the controller without
resetting the serial sequence. To pause, HOLD must
be brought LOW while SCK is LOW. To resume
communication, HOLD is brought HIGH, again while
SCK is LOW. If the pause feature is not used, HOLD
should be held HIGH at all times.
Device Address (A0)
The address inputs is used to set the least significant
bit 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 X9420. A maximum of 2 devices may occupy the
SPI serial bus.
Potentiometer Pins
VH/RH, VL/RL
The VH/RH and VL/RL input are equivalent to the
terminal connections on either end of a mechanical
potentiometer.
VW/RW
The wiper output is 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. Writing to the Wiper Counter
Register is not restricted.
Analog Supplies (V+, V-)
The analog supplies V+, V- are the supply voltages for
the XDCP analog section.
System/Digital Supply (VCC)
VCC is the supply voltage for the system/digital section.
VSS is the system ground.
PIN CONFIGURATION
VCC
CS
RL/VL
RH/VH
RW/VW
SI
WP
VSS
DIP/SOIC
1 16
2 15
3 14
4 13
5 X9420 12
6 11
7 10
89
V+
NC
A0
SO
HOLD
SCK
NC
V-
CS
RL/VL
RH/VH
RW/VW
SI
WP
VSS
TSSOP
1 14
2 13
3 12
4 X9420 11
5 10
69
78
VCC
V+
A0
SO
HOLD
SCK
V-
REV 1.1.6 7/30/02
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/SPI Bus X9420 Single Digitally Con trolled (XDCP) Potentiometer FEATURES Solid-State Potentiometer • SPI se rial interface • Register oriented fo rmat —Direct read/write/transfer wipe r positions —Store as many as four po sitions per potentiometer • Power sup plies —VCC = 2.7V to 5.5V —V+ = 2.7 V to 5.5V —V– = –2.7V to –5.5V • Low power CMOS —Standby current < 1µA • High reliability —Endurance –100,000 data changes per bit per reg ister —Register data retention–100 years • 8-bytes of nonvolatile EEPROM memory • 10KΩ or 2.5KΩ resistor arrays • Resolution: 64 taps each pot • 14-lead TSSOP, 16-lead SOIC, and 1 6-pin plastic DIP packages DESCRIPTION The X9420 integrates a single 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 ar.
Keywords X9420, datasheet, pdf, Xicor, Single, Digitally, Controlled, XDCP, Potentiometer, 9420, 420, 20, X942, X94, X9, Equivalent, stock, pinout, distributor, price, schematic, inventory, databook, Electronic, Components, Parameters, parts, cross reference, chip, Semiconductor, circuit, Electric, manual, substitute




@ 2014 :: Datasheetspdf.com :: Semiconductors datasheet search & download site (Privacy Policy & Contact)