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PDF ( 数据手册 , 数据表 ) X9221WPI

零件编号 X9221WPI
描述 Dual E2POT Nonvolatile Digital Potentiometer
制造商 Xicor
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X9221WPI 数据手册, 描述, 功能
APPLICATION NOTES
AVA I L A B L E
AN20 • AN42 • AN44–48 • AN50 • AN52 • AN53 • AN73
XATed9vr2ma2n1icneaIlnVfoormltaatgioen±5V, 64 Taps
X9221
Dual E2POTNonvolatile Digital Potentiometer
FEATURES
Two E2POTs in One Package
Two-Wire Serial Interface
Register Oriented Format
—Directly Write Wiper Position
—Read Wiper Position
—Store as Many as Four Positions per Pot
Instruction Format
—Quick Transfer of Register Contents to
Resistor Array
Low Power CMOS
Direct Write Cell
—Endurance - 100,000 Writes per Register
—Register Data Retention - 100 years
8 Bytes of E2PROM memory
3 Resistor Array Values
—2Kto 50KMask Programmable
Resolution: 64 Taps each Pot
20-Lead Plastic DIP and 20-Lead SOIC Packages
DESCRIPTION
The X9221 integrates two nonvolatile E2POT™ digitally
controlled potentiometers on a monolithic CMOS micro-
circuit.
The X9221 contains two resistor arrays, each com-
posed of 63 resistive elements. Between each element
and at either end are tap points accessible to the wiper
elements. The position of the wiper element on the array
is controlled by the user through the two-wire serial bus
interface.
Each resistor array has associated with it a wiper counter
register and four 8-bit data registers that can be directly
written and read by the user. The contents of the wiper
counter register control the position of the wiper on the
resistor array.
The data register may be read or written by the user. The
contents of the data registers can be transferred to the
wiper counter register to position the wiper. The current
wiper position can be transferred to any one of its
associated data registers.
FUNCTIONAL DIAGRAM
SCL
SDA
A0
A1
A2
A3
INTERFACE
AND
CONTROL
CIRCUITRY
8
DATA
R0 R1
WIPER
COUNTER
REGISTER
R2 R3 (WCR)
VH0
VL0
VW0
R0 R1 WIPER
COUNTER RESISTOR
REGISTER ARRAY
R2 R3 (WCR)
POT 1
VH1
VL1
VW1
3079 ILL F07.1
© Xicor, Inc. 1994, 1995, 1996 Patents Pending.
3079-1.6 6/12/96 T1/C1/D0 NS
1
Characteristics subject to change without notice







X9221WPI pdf, 数据表
X9221
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 any VH or VL Referenced to VSS ......... ±8V
V = |VH–VL| ......................................................... 16V
Lead Temperature (Soldering, 10 seconds)...... 300°C
*COMMENT
Stresses above those listed under “Absolute Maximum
Ratings” may cause permanent damage to the device.
This is a stress rating only and the functional operation of
the device at these or any other conditions above those
indicated in the operational sections of this specification is
not implied. Exposure to absolute maximum rating condi-
tions for extended periods may affect device reliability.
RECOMMENDED OPERATING CONDITIONS
Temperature
Min.
Max.
Supply Voltage
Limits
Commercial 0°C +70°C
X9221
5V ±10%
Industrial
–40°C
+85°C
3079 PGM T03.1
Military
–55°C
+125°C
3079 PGM T02
ANALOG CHARACTERISTICS (Over recommended operating conditions unless otherwise stated.)
Limits
Symbol
Parameter
Min. Typ.
Max. Units
Test Conditions
RTOTAL End to End Resistance
Power Rating
–20
+20 %
50 mW 25°C, each pot
IW
RW
VTERM
Wiper Current
Wiper Resistance
Voltage on any VH or
or VL Pin
Noise
–1 +1 mA
40 100
Wiper Current = ± 1mA
–5 +5 V
120
dB/ Ref: 1V
Resolution
1.6 %
Absolute Linearity (1)
Relative Linearity (2)
Temperature Coefficient
–1
–0.2
±300
+1
+0.2
MI(3)
MI(3)
ppm/°C
Vw(n)(actual) – Vw(n)(expected)
Vw(n + 1) – [Vw(n) + MI]
3079 PGM T04.2
D.C. OPERATING CHARACTERISTICS (Over recommended operating conditions unless otherwise stated.)
Limits
Symbol
Parameter
Min. Typ.
Max. Units
Test Conditions
lCC Supply Current (Active)
3 mA fSCL = 100KHz, SDA = Open,
Other Inputs = VSS
ISB VCC Current (Standby)
200 500
µA SCL=SDA=VCC, Addr.= VSS
ILI Input Leakage Current
10 µA VIN = VSS to VCC
ILO Output Leakage Current
10 µA VOUT = VSS to VCC
VIH Input HIGH Voltage
2
VCC + 1
V
VIL Input LOW Voltage
–1
0.8 V
VOL Output LOW Voltage
0.4 V IOL = 3mA
Notes: (1) Absolute Linearity is utilized to determine actual wiper voltage versus expected voltage as determined by wiper
3079 PGM T05.3
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
potentiometer. It is a measure of the error in step size.
(3) MI = RTOT/63 or (VH – VL)/63, single pot
8














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