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PDF X9418 Data sheet ( Hoja de datos )
| Número de pieza | X9418 | |
| Descripción | Dual Digitally Controlled Potentiometers | |
| Fabricantes | Xicor | |
| Logotipo |  |
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APPLICATION NOTES
AVAILABLE
AN99 • AN115 • AN120 • AN124 • AN133 • AN134 • AN135
Low Noise/Low Power/2-Wire Bus
X9418
Dual Digitally Controlled Potentiometers (XDCP™)
FEATURES
• Two potentiometers in one package
• 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
• 8-bytes of nonvolatile memory
• 2.5KΩ, 10KΩ resistor array
• Resolution: 64 taps each potentiometer
• 24-pin plastic DIP, 24-lead TSSOP and 24-lead
SOIC packages
DESCRIPTION
The X9418 integrates two 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-
WP
SCL
SDA
A0
A1
A2
A3
Interface
and
Control
Circuitry
8
Data
R0 R1
R2 R3
Wiper
Counter
Register
(WCR)
VH0/RH0
VL0/RL0
VW0/RW0
R0 R1
R2 R3
Wiper
Counter
Register
(WCR)
Resistor
Array
XDCP1
VW1/RW1
VH1/RH1
VL1/RL1
REV 1.1.5 7/23/02
www.xicor.com
Characteristics subject to change without notice. 1 of 21
1 page  
X9418
Figure 3. Two-Byte Instruction Sequence
SCL
SDA
S 0 1 0 1 A3 A2 A1 A0 A I3 I2 I1 I0 R1 R0 0 P0 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 X9418 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
Write Wiper Counter
Register
Read Data Register
Write Data Register
XFR Data Register to
Wiper Counter Register
I3 I2 I1 I0 R1 R0 P1 P0
Operation
1 0 0 1 0 0 0 1/0 Read the contents of the Wiper Counter Register
pointed to by P0
1 0 1 0 0 0 0 1/0 Write new value to the Wiper Counter Register
pointed to by P0
1 0 1 1 1/0 1/0 0 1/0 Read the contents of the Data Register pointed to
by P0 and R1–R0
1 1 0 0 1/0 1/0 0 1/0 Write new value to the Data Register pointed to by
P0 and R1–R0
1 1 0 1 1/0 1/0 0 1/0 Transfer the contents of the Data Register pointed
to by P0 and R1–R0 to its associated Wiper Counter
Register
XFR Wiper Counter
1 1 1 0 1/0 1/0 0 1/0 Transfer the contents of the Wiper Counter Register
Register to Data Register
pointed to by P0 to the Data Register pointed to by
R1–R0
Global XFR Data
0 0 0 1 1/0 1/0 0 0 Transfer the contents of the Data Registers pointed
Registers to Wiper
Counter Registers
to by R1–R0 of both pots to their respective Wiper
Counter Registers
Global XFR Wiper
1 0 0 0 1/0 1/0 0 0 Transfer the contents of both Wiper Counter
Counter Registers to
Registers to their respective data Registers pointed
Data Register
to by R1–R0 of both pots
Increment/Decrement
0 0 1 0 0 0 0 1/0 Enable Increment/decrement of the Wiper Counter
Wiper Counter Register
Register pointed to by P0
Note: (7) 1/0 = data is one or zero
REV 1.1.5 7/23/02
www.xicor.com
Characteristics subject to change without notice. 5 of 21
5 Page 
X9418
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, VL/RL, VW/RW ............................. V- to V+
Lead temperature (soldering, 10 seconds) ........300°C
IW (10 seconds) ................................................. ±6mA
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
X9418
X9418-2.7
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 X9418
X9418-2.7
V- Voltage on V- pin X9418
X9418-2.7
VTERM
Voltage on any VH/RH, VL/RL or
VW/RW
Noise
Resolution (4)
Absolute linearity (1)
Relative linearity (2)
Temperature Coefficient of RTOTAL
Ratiometric Temperature Coefficient
CH/CL/CW Potentiometer Capacitances
IAL RH, RL, RW Leakage Current
Min.
–20
–3
+4.5
+2.7
-5.5
-5.5
V-
–1
–0.2
Limits
Typ. Max.
+20
50
+3
150 250
40 100
+5.5
+5.5
-4.5
-2.7
V+
Unit
%
mW
mA
Ω
Ω
V
V
V
Test Conditions
25°C, each pot
Wiper current = ± 1mA, V+, V- = ±3V
Wiper current = ± 1mA, V+, V- = ±5V
-120
1.6
±300
10/10/25
0.1
+1
+0.2
±20
10
dBV Ref: 1kHz
% See Note 4
MI(3)
MI(3)
ppm/°C
Vw(n)(actual)—Vw(n)(expected)(4)
Vw(n + 1)—[Vw(n) + MI](4)
See Note 4
ppm/°C See Note 4
pF See Circuit #3,
Spice Macromodel
µA VIN = V– to V+. Device is in Stand-by
mode.
REV 1.1.5 7/23/02
www.xicor.com
Characteristics subject to change without notice. 11 of 21
11 Page | ||
| Páginas | Total 21 Páginas | |
| PDF Descargar | [ Datasheet X9418.PDF ] | |
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