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PDF X9428 Data sheet ( Hoja de datos )
| Número de pieza | X9428 | |
| Descripción | Single Digitally Controlled Potentiometer | |
| Fabricantes | Xicor | |
| Logotipo |  |
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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
1 page  
X9428
Figure 3. Two-Byte Instruction Sequence
SCL
SDA
S 0 1 0 1 A3 A2 0 A0 A I3 I2 I1 I0 R1 R0 0 0 A S
T C CT
A K KO
RP
T
The Increment/Decrement command is different from
the other commands. Once the command is issued
and the X9428 has responded with an acknowledge,
the master can clock the selected wiper up and/or
down in one segment steps; thereby, providing a fine
tuning capability to the host. For each SCL clock pulse
(tHIGH) while SDA is HIGH, the selected wiper will
move one resistor segment towards the VH/RH
terminal. Similarly, for each SCL clock pulse while SDA
is LOW, the selected wiper will move one resistor
segment towards the VL/RL terminal. A detailed
illustration of the sequence and timing for this
operation are shown in Figures 5 and 6 respectively.
Table 1. Instruction Set
Instruction Set
Instruction
Read Wiper Counter
Register
I3 I2 I1 I0 R1 R0 X1 X0
Operation
1 0 0 1 0 0 0 0 Read the contents of the Wiper Counter Register
Write Wiper Counter
Register
1 0 1 0 0 0 0 0 Write new value to the Wiper Counter Register
Read Data Register
1 0 1 1 1/0 1/0 0 0 Read the contents of the Data Register pointed to
by R1–R0
Write Data Register
1 1 0 0 1/0 1/0 0 0 Write new value to the Data Register pointed to by
R1–R0
XFR Data Register to
1 1 0 1 1/0 1/0 0 0 Transfer the contents of the Data Register pointed
Wiper Counter Register
to by R1–R0 to its Wiper Counter Register
XFR Wiper Counter
1 1 1 0 1/0 1/0 0 0 Transfer the contents of the Wiper Counter Register
Register to Data Register
to the Data Register pointed to by R1–R0
Increment/Decrement 0 0 1 0 0 0 0 1/0 Enable Increment/decrement of the Wiper Counter
Wiper Counter Register
Register
Note: (7) 1/0 = data is one or zero
REV 1.1.5 7/8/03
www.xicor.com
Characteristics subject to change without notice. 5 of 20
5 Page 
X9428
ABSOLUTE MAXIMUM RATINGS
Temperature under bias ....................–65°C to +135°C
Storage temperature .........................–65°C to +150°C
Voltage on SDA, 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............................................................... V+
Any VL/RL................................................................. V-
Lead temperature (soldering, 10 seconds)........ 300°C
IW (10 seconds)................................................ ±12mA
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.
RECOMMENDED OPERATING CONDITIONS
Temperature
Commercial
Industrial
Min.
0°C
–40°C
Max.
+70°C
+85°C
Device
X9428
X9428-2.7
Supply Voltage (VCC) Limits
5V ±10%
2.7V to 5.5V
ANALOG CHARACTERISTICS (Over recommended operating conditions unless otherwise stated.)
Symbol
IW
RW
Parameter
End to end resistance tolerance
Power rating
Wiper current
Wiper resistance
V+ Voltage on V+ pin X9428
X9428-2.7
V- Voltage on V- pin X9428
X9428-2.7
VTERM
Voltage on any VH/RH or VL/RL pin
Noise
Resolution (4)
Absolute linearity (1)
Relative linearity (2)
Temperature Coefficient of RTOTAL
Ratiometric Temperature Coefficient
CH/CL/CW Potentiometer Capacitances
Min.
+4.5
+2.7
-5.5
-5.5
V-
Limits
Typ. Max.
±20
50
±6
150 250
40 100
+5.5
+5.5
-4.5
-2.7
V+
-140
1.6
±1
±0.2
±300
±20
10/10/25
Unit
%
mW
mA
Ω
Ω
V
V
V
dBV
%
MI(3)
MI(3)
ppm/°C
ppm/°C
pF
Test Conditions
25°C, each pot
Wiper current = ± 1mA, VCC = 3V
Wiper current = ± 1mA, VCC = 5V
Ref: 1kHz
Vw(n)(actual)—Vw(n)(expected)
Vw(n + 1)—[Vw(n) + MI]
See Circuit #3,
Spice Macromodel
REV 1.1.5 7/8/03
www.xicor.com
Characteristics subject to change without notice. 11 of 20
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet X9428.PDF ] | |
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