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PDF X9420 Data sheet ( Hoja de datos )
| Número de pieza | X9420 | |
| Descripción | Single Digitally Controlled Potentiometer | |
| Fabricantes | Intersil Corporation | |
| Logotipo |  |
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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
• 10kΩ or 2.5kΩ Resistor Arrays
• Resolution: 64 Taps Each Pot
•www.DataSheet4U.com 14 Ld TSSOP and 16 Ld SOIC Packages
• Pb-Free Plus Anneal Available (RoHS Compliant)
X9420
Low Noise/Low Power/SPI Bus
April 26, 2006
FN8195.1
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
1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
XDCP is a trademark of Intersil Americas Inc. Copyright Intersil Americas Inc. 2005, 2006. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
1 page  
X9420
Figure 1. Detailed Potentiometer Block Diagram
Serial Data Path
From Interface
Circuitry
Register 0
8
REGISTER 2
IF WCR = 00[H] THEN VW = VL
IF WCR = 3F[H] THEN VW = VH
Register 1
6
REGISTER 3
UP/DN
Modified SCK
Serial
Bus
Input
Parallel
Bus
Input
Wiper
Counter
Register
(WCR)
INC/DEC
Logic
UP/DN
CLK
C
O
U
N
T
E
R
D
E
C
O
D
E
VH
VL
Write in Process
The contents of the Data Registers are saved to
nonvolatile memory when the CS pin goes from LOW to
HIGH after a complete write sequence is received by
the device. The progress of this internal write operation
can be monitored by a Write In Process bit (WIP). The
WIP bit is read with a Read Status command.
INSTRUCTIONS
Address/Identification (ID) Byte
The first byte sent to the X9420 from the host,
following a CS going HIGH to LOW, is called the
Address or Identification byte. The most significant
four bits of the slave address are a device type
identifier, for the X9420 this is fixed as 0101[B] (refer
to Figure 2).
The least significant bit in the ID byte selects one of
two devices on the bus. The physical device address
is defined by the state of the A0 input pin. The X9420
compares the serial data stream with the address
input state; a successful compare of the address bit is
required for the X9420 to successfully continue the
command sequence. The A0 input can be actively
driven by a CMOS input signal or tied to VCC or VSS.
The remaining three bits in the ID byte must be set to 110.
VW
Figure 2. Address/Identification Byte Format
Device Type
Identifier
0 1 0 1 1 1 0 A0
Device Address
Instruction Byte
The next byte sent to the X9420 contains the
instruction and register pointer information. The four
most significant bits are the instruction. The next two
bits point to one of four data registers. The format is
shown below in Figure 3.
Figure 3. Instruction Byte Format
Register
Select
I3 I2 I1 I0 R1 R0 0
0
Instructions
5 FN8195.1
April 26, 2006
5 Page 
X9420
ABSOLUTE MAXIMUM RATINGS
Temperature under bias .....................-65 C to +135 C
Storage temperature ..........................-65 C to +150 C
Voltage on SCK, SCL or any
address input with respect to VSS ........... -1V to +7V
Voltage on V+ (referenced to VSS)........................ 10V
Voltage on V- (referenced to VSS)........................-10V
(V+) - (V-) .............................................................. 12V
Any VH/RH, VL/RL, VW/RW ........................... V- to V+
Lead temperature (soldering, 10s) .....................300 C
IW (10s) ..............................................................±6mA
RECOMMENDED OPERATING CONDITIONS
Temp
Commercial
Industrial
Min.
0°C
-40°C
Max.
+70°C
+85°C
COMMENT
Stresses above those listed under “Absolute Maximum
Ratings” may cause permanent damage to the device.
This is a stress rating only; functional operation of the
device (at these or any other conditions above those
listed in the operational sections of this specification)
is not implied. Exposure to absolute maximum rating
conditions for extended periods may affect device
reliability.
Device
X9420
X9420-2.7
Supply Voltage (VCC) Limits
5V ± 10%
2.7V to 5.5V
ANALOG CHARACTERISTICS (Over recommended operating conditions unless otherwise stated.)
Symbol
RTOTAL
IW
RW
Parameter
End to End Resistance
Power Rating
Wiper Current
Wiper Resistance
Vv+
Vv-
VTERM
CH/CL/CW
IAL
Voltage on V+ Pin
X9420
X9420-2.7
Voltage on V- Pin
X9420
X9420-2.7
Voltage on any VH/RH, VL/RL, VW/RW
Noise
Resolution(4)
Absolute Linearity(1)
Relative Linearity(2)
Temperature Coefficient of RTOTAL
Ratiometric Temperature Coefficient
Potentiometer Capacitances
Rh, RI, Rw leakage current
Min.
+4.5
+2.7
-5.5
-5.5
V-
Limits
Typ. Max.
±20
50
±3
150 250
40 100
-140
1.6
±300
10/10/25
0.1
+5.5
+5.5
-4.5
-2.7
V+
±1
±0.2
±20
10
Units
%
mW
mA
Ω
Ω
V
V
V
dBV
%
MI(3)
MI(3)
ppm/ C
ppm/ C
pF
µA
Test Conditions
25 C, each pot
Wiper Current = ± 1mA,
V+/V- = ±3V
Wiper Current = ± 1mA,
V+/V- = ±5V
Ref: 1kHz
See Note 5
Vw(n)(actual) - Vw(n)(expected)
Vw(n + 1) - [Vw(n) + MI]
See Note 5
See Note 5
See Circuit #3
Vin = V- to V+. Device is in
stand-by mode.
Notes: (1) Absolute Linearity is utilized to determine actual wiper voltage versus expected voltage as determined by wiper position when used as
a potentiometer.
(2) Relative Linearity is utilized to determine the actual change in voltage between two successive tap positions when used as a potenti-
ometer. It is a measure of the error in step size.
(3) MI = RTOT/63 or (VH - VL)/63, single pot.
(4) Typical = Individual array resolution.
11 FN8195.1
April 26, 2006
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet X9420.PDF ] | |
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