鈩?/div>
Nonvolatile Digital Potentiometer
FEATURES
DESCRIPTION
The X9241 integrates four nonvolatile E
2
POT digitally
controlled potentiometers on a monolithic CMOS micro-
circuit.
The X9241 contains four 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.
The arrays may be cascaded to form resistive elements
with 127, 190 or 253 taps.
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Four E
2
POTs in One Package
Two-Wire Serial Interface
Register Oriented Format
鈥擠irectly Write Wiper Position
鈥擱ead Wiper Position
鈥擲tore as Many as Four Positions per Pot
Instruction Format
鈥擰uick Transfer of Register Contents to
Resistor Array
鈥擟ascade Resistor Arrays
Low Power CMOS
Direct Write Cell
鈥擡ndurance - 100,000 Data Changes per Register
鈥擱egister Data Retention - 100 years
16 Bytes of E
2
PROM memory
3 Resistor Array Values
鈥?K
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to 50K
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Mask Programmable
鈥擟ascadable For Values of 500
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to 200K
鈩?/div>
Resolution: 64 Taps each Pot
20-Lead Plastic DIP, 20-Lead TSSOP and
20-Lead SOIC Packages
FUNCTIONAL DIAGRAM
VH2
WIPER RESISTOR
COUNTER ARRAY
REGISTER
POT 2
(WCR)
R0 R1
WIPER
COUNTER
REGISTER
(WCR)
R2 R3
SCL
SDA
A0
A1
A2
A3
VH0
R0 R1
VL0
VW0
R2 R3
VL2
VW2
INTERFACE
AND
CONTROL
CIRCUITRY
8
DATA
R0 R1
VH1
WIPER
COUNTER RESISTOR
ARRAY
REGISTER
POT 1
(WCR)
R0 R1
VH3
WIPER
RESISTOR
COUNTER
ARRAY
REGISTER
POT 3
(WCR)
R2 R3
VL1
VW1
R2 R3
VL3
VW3
3864 ILL F07.1
漏 Xicor, Inc. 1994, 1995, 1996 Patents Pending
3864-2.7 7/1/96 T0/C3/D3 NS
1
Characteristics subject to change without notice
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