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PDF X9418 Data sheet ( Hoja de datos )
| Número de pieza | X9418 | |
| Descripción | Dual Digitally Controlled Potentiometers | |
| Fabricantes | Intersil Corporation | |
| Logotipo |  |
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Data Sheet
X9418
Low Noise/Low Power/2-Wire Bus
October 12, 2006
FN8194.3
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
•www.DataSheet4U.com Resolution: 64 taps each potentiometer
• 24-pin plastic DIP, 24-lead TSSOP and 24-lead
SOIC packages
• Pb-Free plus anneal available (RoHS compliant)
BLOCK DIAGRAM
VCC
VSS
V+
V-
WP
SCL
SDA
A0
A1
A2
A3
Interface
and
Control
Circuitry
8
Data
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.
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
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  
X9418
Figure 2. Instruction Byte Format
Register
Select
I3 I2 I1 I0 R1 R0 0 P0
Instructions
Wiper Counter
Register Select
The four high order bits define the instruction. The
next two bits (R1 and R0) select one of the four
registers that is to be acted upon when a register
oriented instruction is issued. The last bits (P0) select
which one of the two potentiometers is to be affected
by the instruction. Bit 1 is defined to be 0.
Four of the nine instructions end with the transmission
of the instruction byte. The basic sequence is
illustrated in Figure 3. These two-byte instructions
exchange data between the wiper counter register and
one of the data registers. A transfer from a Data
Register to a Wiper Counter Register is essentially a
write to a static RAM. The response of the wiper to this
action will be delayed tWRL. A transfer from the wiper
counter register (current wiper position), to a Data
Register is a write to nonvolatile memory and takes a
minimum of tWR to complete. The transfer can occur
between one of the two potentiometers and one of its
Figure 3. Two-Byte Instruction Sequence
associated registers; or it may occur globally, wherein
the transfer occurs between both of the
potentiometers and one of their associated registers.
Four instructions require a three-byte sequence to
complete. These instructions transfer data between
the host and the X9418; either between the host and
one of the Data Registers or directly between the host
and the wiper counter register. These instructions are:
Read Wiper Counter Register (read the current wiper
position of the selected pot), write Wiper Counter
Register (change current wiper position of the selected
pot), read Data Register (read the contents of the
selected nonvolatile register) and write Data Register
(write a new value to the selected Data Register). The
sequence of operations is shown in Figure 4.
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.
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
5 FN8194.3
October 12, 2006
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
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
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-
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
dBV Ref: 1kHz
1.6 % See Note 4
-1 +1 MI(3) Vw(n)(actual) - Vw(n)(expected)(4)
-0.2 +0.2 MI(3) Vw(n + 1 - [Vw(n) + MI](4)
±300
ppm/°C See Note 4
±20 ppm/°C See Note 4
10/10/25
pF See Circuit #3,
Spice Macromodel
0.1 10 µA VIN = V- to V+. Device is in Stand-by
mode.
11 FN8194.3
October 12, 2006
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet X9418.PDF ] | |
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