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X9408 Schematic ( PDF Datasheet ) - Intersil Corporation

Teilenummer X9408
Beschreibung Low Noise/Low Power/2-Wire Bus
Hersteller Intersil Corporation
Logo Intersil Corporation Logo 




Gesamt 21 Seiten
X9408 Datasheet, Funktion
®
Data Sheet
X9408
Low Noise/Low Power/2-Wire Bus
September 19, 2005
FN8191.2
Quad Digitally Controlled (XDCP™)
Potentiometers
FEATURES
• Four potentiometers in one package
• 64 resistor taps per potentiometer
• 2-wire serial interface
• Wiper resistance, 40typical at 5V
• Four nonvolatile data registers for each pot
• Nonvolatile storage of wiper position
• Standby current < 1µA max (total package)
• VCC = 2.7V to 5.5V operation
V+ = 2.7V to 5.5V
V- = –2.7V to -5.5V
• 10k, 2.5kend to end resistances
• High reliability
—Endurance–100,000 data changes per bit per
register
—Register data retention–100 years
• 24 Ld SOIC, 24 Ld TSSOP, 24 Ld PDIP packages
• Pb-free plus anneal available (RoHS compliant)
DESCRIPTION
The X9408 integrates four digitally controlled
potentiometers (XDCP) on a monolithic CMOS
integrated circuit.
The digital 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 four
non-volatile Data Registers 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
though the switches. Powerup recalls the contents of
the default data register (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
www.DataSheet4U.com
VCC
VSS
V+
V-
WP
SCL
SDA
A0
A1
A2
A3
Interface
and
Control
Circuitry
8
Data
Pot 0
R0 R1
R2 R3
Wiper
Counter
Register
(WCR)
VH0/RH0
VL0/RL0
VW0/RW0
R0 R1
R2 R3
Wiper
Counter
Register
(WCR)
Resistor
Array
Pot 2
VH2/RH2
VL2/RL2
VW2/RW2
R0 R1
R2 R3
Wiper
Counter
Register
(WCR)
VW1/RW1
Resistor
Array
Pot 1
VH1/RH1
VL1/RL1
R0 R1
R2 R3
Wiper
Counter
Register
(WCR)
VW3/RW3
Resistor
Array
Pot 3
VH3/RH3
VL3/RL3
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. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.






X9408 Datasheet, Funktion
Figure 3. Two-Byte Instruction Sequence
X9408
SCL
SDA
S 0 1 0 1 A3 A2 A1 A0 A I3 I2 I1 I0 R1 R0 P1 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 X9408 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 RH terminal.
Similarly, for each SCL clock pulse while SDA is LOW,
the selected wiper will move one resistor segment
towards the 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
Read Wiper Counter
Register
Write Wiper Counter
Register
Read Data Register
I3 I2
10
10
10
Write Data Register
11
XFR Data Register to 1 1
Wiper Counter Register
XFR Wiper Counter
Register to Data
Register
1
Global XFR Data Regis- 0
ters to Wiper Counter
Registers
Global XFR Wiper
Counter Registers to
Data Register
1
Increment/Decrement 0
Wiper Counter Register
Note: (7) 1/0 = data is one or zero
1
0
0
0
Instruction Set
I1 I0 R1 R0
010 0
P1
P1
1 0 0 0 P1
1 1 R1 R0 P1
0 0 R1 R0 P1
0 1 R1 R0 P1
1 0 R1 R0 P1
0 1 R1 R0 0
0 0 R1 R0 0
1 0 0 0 P1
P0 Operation
P0 Read the contents of the Wiper Counter Register
pointed to by P1 - P0
P0 Write new value to the Wiper Counter Register pointed
to by P1 - P0
P0 Read the contents of the Data Register pointed to by
P1 - P0 and R1 - R0
P0 Write new value to the Data Register pointed to by
P1 - P0 and R1 - R0
P0 Transfer the contents of the Data Register pointed to
by P1 - P0 and R1 - R0 to its associated Wiper Counter
Register
P0 Transfer the contents of the Wiper Counter Register
pointed to by P1 - P0 to the Data Register pointed to
by R1 - R0
0 Transfer the contents of the Data Registers pointed to by
R1 - R0 of all four pots to their respective Wiper Counter
Registers
0 Transfer the contents of both Wiper Counter Registers
to their respective Data Registers pointed to by
R1 - R0 of all four pots
P0 Enable Increment/decrement of the Wiper Counter
Register pointed to by P1 - P0
6 FN8191.2
September 19, 2005

6 Page









X9408 pdf, datenblatt
X9408
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, 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; the 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
X9408
X9408-2.7
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 tolerance
Power rating
Wiper current
Wiper resistance
VV+
VV-
VTERM
Voltage on V+ pin X9408
X9408-2.7
Voltage on V- pin
X9408
X9408-2.7
Voltage on any VH/RH, VL/RL or
VW/RW pin
Noise
Resolution
Absolute linearity (1)
Relative linearity (2)
Temperature coefficient of RTOTAL
Ratiometric Temperature Coefficient
CH/CL/CW Potentiometer Capacitances
IAL VH/RH, VL/RL, VW/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
V
V
V
Test Condition
25°C, each pot
IW = ± 1mA @ V+, V- = ±3V
IW = ± 1mA @ V+, V- = ±5V
-120
dBV Ref: 1kHz
1.6 % See Note 4
-1
+1
MI(3)
VV((VVwwnn//RRwwnn))((aecxtpueaclt)e-d)(4)
-0.2
+0.2
MI(3)
[VV((VVww((nn+)1/R)/wR(wn()n) ++1)M) I-](4)
±300
ppm/°C See Note 4
20 ppm/°C See Note 4
10/10/25
pF See Macro model
0.1 10 µA VIN = V- to V+. Device is in
Stand-by mode.
12 FN8191.2
September 19, 2005

12 Page





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